updates

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/__init__.py

@@ -0,0 +1,45 @@
+r"""The :mod:`loky` module manages a pool of worker that can be re-used across time.
+It provides a robust and dynamic implementation os the
+:class:`ProcessPoolExecutor` and a function :func:`get_reusable_executor` which
+hide the pool management under the hood.
+"""
+
+from concurrent.futures import (
+    ALL_COMPLETED,
+    FIRST_COMPLETED,
+    FIRST_EXCEPTION,
+    CancelledError,
+    Executor,
+    TimeoutError,
+    as_completed,
+    wait,
+)
+
+from ._base import Future
+from .backend.context import cpu_count
+from .backend.reduction import set_loky_pickler
+from .reusable_executor import get_reusable_executor
+from .cloudpickle_wrapper import wrap_non_picklable_objects
+from .process_executor import BrokenProcessPool, ProcessPoolExecutor
+
+
+__all__ = [
+    "get_reusable_executor",
+    "cpu_count",
+    "wait",
+    "as_completed",
+    "Future",
+    "Executor",
+    "ProcessPoolExecutor",
+    "BrokenProcessPool",
+    "CancelledError",
+    "TimeoutError",
+    "FIRST_COMPLETED",
+    "FIRST_EXCEPTION",
+    "ALL_COMPLETED",
+    "wrap_non_picklable_objects",
+    "set_loky_pickler",
+]
+
+
+__version__ = "3.5.6"

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/_base.py

@@ -0,0 +1,28 @@
+###############################################################################
+# Modification of concurrent.futures.Future
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+# adapted from concurrent/futures/_base.py (17/02/2017)
+#  * Do not use yield from
+#  * Use old super syntax
+#
+# Copyright 2009 Brian Quinlan. All Rights Reserved.
+# Licensed to PSF under a Contributor Agreement.
+
+from concurrent.futures import Future as _BaseFuture
+from concurrent.futures._base import LOGGER
+
+
+# To make loky._base.Future instances awaitable  by concurrent.futures.wait,
+# derive our custom Future class from _BaseFuture. _invoke_callback is the only
+# modification made to this class in loky.
+# TODO investigate why using `concurrent.futures.Future` directly does not
+# always work in our test suite.
+class Future(_BaseFuture):
+    def _invoke_callbacks(self):
+        for callback in self._done_callbacks:
+            try:
+                callback(self)
+            except BaseException:
+                LOGGER.exception(f"exception calling callback for {self!r}")

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/__init__.py

@@ -0,0 +1,14 @@
+import os
+from multiprocessing import synchronize
+
+from .context import get_context
+
+
+def _make_name():
+    return f"/loky-{os.getpid()}-{next(synchronize.SemLock._rand)}"
+
+
+# monkey patch the name creation for multiprocessing
+synchronize.SemLock._make_name = staticmethod(_make_name)
+
+__all__ = ["get_context"]

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/_posix_reduction.py

@@ -0,0 +1,67 @@
+###############################################################################
+# Extra reducers for Unix based system and connections objects
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+# adapted from multiprocessing/reduction.py (17/02/2017)
+#  * Add adapted reduction for LokyProcesses and socket/Connection
+#
+import os
+import socket
+import _socket
+from multiprocessing.connection import Connection
+from multiprocessing.context import get_spawning_popen
+
+from .reduction import register
+
+HAVE_SEND_HANDLE = (
+    hasattr(socket, "CMSG_LEN")
+    and hasattr(socket, "SCM_RIGHTS")
+    and hasattr(socket.socket, "sendmsg")
+)
+
+
+def _mk_inheritable(fd):
+    os.set_inheritable(fd, True)
+    return fd
+
+
+def DupFd(fd):
+    """Return a wrapper for an fd."""
+    popen_obj = get_spawning_popen()
+    if popen_obj is not None:
+        return popen_obj.DupFd(popen_obj.duplicate_for_child(fd))
+    elif HAVE_SEND_HANDLE:
+        from multiprocessing import resource_sharer
+
+        return resource_sharer.DupFd(fd)
+    else:
+        raise TypeError(
+            "Cannot pickle connection object. This object can only be "
+            "passed when spawning a new process"
+        )
+
+
+def _reduce_socket(s):
+    df = DupFd(s.fileno())
+    return _rebuild_socket, (df, s.family, s.type, s.proto)
+
+
+def _rebuild_socket(df, family, type, proto):
+    fd = df.detach()
+    return socket.fromfd(fd, family, type, proto)
+
+
+def rebuild_connection(df, readable, writable):
+    fd = df.detach()
+    return Connection(fd, readable, writable)
+
+
+def reduce_connection(conn):
+    df = DupFd(conn.fileno())
+    return rebuild_connection, (df, conn.readable, conn.writable)
+
+
+register(socket.socket, _reduce_socket)
+register(_socket.socket, _reduce_socket)
+register(Connection, reduce_connection)

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/_win_reduction.py

@@ -0,0 +1,18 @@
+###############################################################################
+# Extra reducers for Windows system and connections objects
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+# adapted from multiprocessing/reduction.py (17/02/2017)
+#  * Add adapted reduction for LokyProcesses and socket/PipeConnection
+#
+import socket
+from multiprocessing import connection
+from multiprocessing.reduction import _reduce_socket
+
+from .reduction import register
+
+# register reduction for win32 communication objects
+register(socket.socket, _reduce_socket)
+register(connection.Connection, connection.reduce_connection)
+register(connection.PipeConnection, connection.reduce_pipe_connection)

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/context.py

@@ -0,0 +1,405 @@
+###############################################################################
+# Basic context management with LokyContext
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+# adapted from multiprocessing/context.py
+#  * Create a context ensuring loky uses only objects that are compatible
+#  * Add LokyContext to the list of context of multiprocessing so loky can be
+#    used with multiprocessing.set_start_method
+#  * Implement a CFS-aware amd physical-core aware cpu_count function.
+#
+import os
+import sys
+import math
+import subprocess
+import traceback
+import warnings
+import multiprocessing as mp
+from multiprocessing import get_context as mp_get_context
+from multiprocessing.context import BaseContext
+from concurrent.futures.process import _MAX_WINDOWS_WORKERS
+
+
+from .process import LokyProcess, LokyInitMainProcess
+
+# Apparently, on older Python versions, loky cannot work 61 workers on Windows
+# but instead 60: ¯\_(ツ)_/¯
+if sys.version_info < (3, 10):
+    _MAX_WINDOWS_WORKERS = _MAX_WINDOWS_WORKERS - 1
+
+START_METHODS = ["loky", "loky_init_main", "spawn"]
+if sys.platform != "win32":
+    START_METHODS += ["fork", "forkserver"]
+
+_DEFAULT_START_METHOD = None
+
+# Cache for the number of physical cores to avoid repeating subprocess calls.
+# It should not change during the lifetime of the program.
+physical_cores_cache = None
+
+
+def get_context(method=None):
+    # Try to overload the default context
+    method = method or _DEFAULT_START_METHOD or "loky"
+    if method == "fork":
+        # If 'fork' is explicitly requested, warn user about potential issues.
+        warnings.warn(
+            "`fork` start method should not be used with "
+            "`loky` as it does not respect POSIX. Try using "
+            "`spawn` or `loky` instead.",
+            UserWarning,
+        )
+    try:
+        return mp_get_context(method)
+    except ValueError:
+        raise ValueError(
+            f"Unknown context '{method}'. Value should be in "
+            f"{START_METHODS}."
+        )
+
+
+def set_start_method(method, force=False):
+    global _DEFAULT_START_METHOD
+    if _DEFAULT_START_METHOD is not None and not force:
+        raise RuntimeError("context has already been set")
+    assert method is None or method in START_METHODS, (
+        f"'{method}' is not a valid start_method. It should be in "
+        f"{START_METHODS}"
+    )
+
+    _DEFAULT_START_METHOD = method
+
+
+def get_start_method():
+    return _DEFAULT_START_METHOD
+
+
+def cpu_count(only_physical_cores=False):
+    """Return the number of CPUs the current process can use.
+
+    The returned number of CPUs accounts for:
+     * the number of CPUs in the system, as given by
+       ``multiprocessing.cpu_count``;
+     * the CPU affinity settings of the current process
+       (available on some Unix systems);
+     * Cgroup CPU bandwidth limit (available on Linux only, typically
+       set by docker and similar container orchestration systems);
+     * the value of the LOKY_MAX_CPU_COUNT environment variable if defined.
+    and is given as the minimum of these constraints.
+
+    If ``only_physical_cores`` is True, return the number of physical cores
+    instead of the number of logical cores (hyperthreading / SMT). Note that
+    this option is not enforced if the number of usable cores is controlled in
+    any other way such as: process affinity, Cgroup restricted CPU bandwidth
+    or the LOKY_MAX_CPU_COUNT environment variable. If the number of physical
+    cores is not found, return the number of logical cores.
+
+    Note that on Windows, the returned number of CPUs cannot exceed 61 (or 60 for
+    Python < 3.10), see:
+    https://bugs.python.org/issue26903.
+
+    It is also always larger or equal to 1.
+    """
+    # Note: os.cpu_count() is allowed to return None in its docstring
+    os_cpu_count = os.cpu_count() or 1
+    if sys.platform == "win32":
+        # On Windows, attempting to use more than 61 CPUs would result in a
+        # OS-level error. See https://bugs.python.org/issue26903. According to
+        # https://learn.microsoft.com/en-us/windows/win32/procthread/processor-groups
+        # it might be possible to go beyond with a lot of extra work but this
+        # does not look easy.
+        os_cpu_count = min(os_cpu_count, _MAX_WINDOWS_WORKERS)
+
+    cpu_count_user = _cpu_count_user(os_cpu_count)
+    aggregate_cpu_count = max(min(os_cpu_count, cpu_count_user), 1)
+
+    if not only_physical_cores:
+        return aggregate_cpu_count
+
+    if cpu_count_user < os_cpu_count:
+        # Respect user setting
+        return max(cpu_count_user, 1)
+
+    cpu_count_physical, exception = _count_physical_cores()
+    if cpu_count_physical != "not found":
+        return cpu_count_physical
+
+    # Fallback to default behavior
+    if exception is not None:
+        # warns only the first time
+        warnings.warn(
+            "Could not find the number of physical cores for the "
+            f"following reason:\n{exception}\n"
+            "Returning the number of logical cores instead. You can "
+            "silence this warning by setting LOKY_MAX_CPU_COUNT to "
+            "the number of cores you want to use."
+        )
+        traceback.print_tb(exception.__traceback__)
+
+    return aggregate_cpu_count
+
+
+def _cpu_count_cgroup(os_cpu_count):
+    # Cgroup CPU bandwidth limit available in Linux since 2.6 kernel
+    cpu_max_fname = "/sys/fs/cgroup/cpu.max"
+    cfs_quota_fname = "/sys/fs/cgroup/cpu/cpu.cfs_quota_us"
+    cfs_period_fname = "/sys/fs/cgroup/cpu/cpu.cfs_period_us"
+    if os.path.exists(cpu_max_fname):
+        # cgroup v2
+        # https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html
+        with open(cpu_max_fname) as fh:
+            cpu_quota_us, cpu_period_us = fh.read().strip().split()
+    elif os.path.exists(cfs_quota_fname) and os.path.exists(cfs_period_fname):
+        # cgroup v1
+        # https://www.kernel.org/doc/html/latest/scheduler/sched-bwc.html#management
+        with open(cfs_quota_fname) as fh:
+            cpu_quota_us = fh.read().strip()
+        with open(cfs_period_fname) as fh:
+            cpu_period_us = fh.read().strip()
+    else:
+        # No Cgroup CPU bandwidth limit (e.g. non-Linux platform)
+        cpu_quota_us = "max"
+        cpu_period_us = 100_000  # unused, for consistency with default values
+
+    if cpu_quota_us == "max":
+        # No active Cgroup quota on a Cgroup-capable platform
+        return os_cpu_count
+    else:
+        cpu_quota_us = int(cpu_quota_us)
+        cpu_period_us = int(cpu_period_us)
+        if cpu_quota_us > 0 and cpu_period_us > 0:
+            return math.ceil(cpu_quota_us / cpu_period_us)
+        else:  # pragma: no cover
+            # Setting a negative cpu_quota_us value is a valid way to disable
+            # cgroup CPU bandwith limits
+            return os_cpu_count
+
+
+def _cpu_count_affinity(os_cpu_count):
+    # Number of available CPUs given affinity settings
+    if hasattr(os, "sched_getaffinity"):
+        try:
+            return len(os.sched_getaffinity(0))
+        except NotImplementedError:
+            pass
+
+    # On some platforms, os.sched_getaffinity does not exist or raises
+    # NotImplementedError, let's try with the psutil if installed.
+    try:
+        import psutil
+
+        p = psutil.Process()
+        if hasattr(p, "cpu_affinity"):
+            return len(p.cpu_affinity())
+
+    except ImportError:  # pragma: no cover
+        if (
+            sys.platform == "linux"
+            and os.environ.get("LOKY_MAX_CPU_COUNT") is None
+        ):
+            # Some platforms don't implement os.sched_getaffinity on Linux which
+            # can cause severe oversubscription problems. Better warn the
+            # user in this particularly pathological case which can wreck
+            # havoc, typically on CI workers.
+            warnings.warn(
+                "Failed to inspect CPU affinity constraints on this system. "
+                "Please install psutil or explictly set LOKY_MAX_CPU_COUNT."
+            )
+
+    # This can happen for platforms that do not implement any kind of CPU
+    # infinity such as macOS-based platforms.
+    return os_cpu_count
+
+
+def _cpu_count_user(os_cpu_count):
+    """Number of user defined available CPUs"""
+    cpu_count_affinity = _cpu_count_affinity(os_cpu_count)
+
+    cpu_count_cgroup = _cpu_count_cgroup(os_cpu_count)
+
+    # User defined soft-limit passed as a loky specific environment variable.
+    cpu_count_loky = int(os.environ.get("LOKY_MAX_CPU_COUNT", os_cpu_count))
+
+    return min(cpu_count_affinity, cpu_count_cgroup, cpu_count_loky)
+
+
+def _count_physical_cores():
+    """Return a tuple (number of physical cores, exception)
+
+    If the number of physical cores is found, exception is set to None.
+    If it has not been found, return ("not found", exception).
+
+    The number of physical cores is cached to avoid repeating subprocess calls.
+    """
+    exception = None
+
+    # First check if the value is cached
+    global physical_cores_cache
+    if physical_cores_cache is not None:
+        return physical_cores_cache, exception
+
+    # Not cached yet, find it
+    try:
+        if sys.platform == "linux":
+            cpu_count_physical = _count_physical_cores_linux()
+        elif sys.platform == "win32":
+            cpu_count_physical = _count_physical_cores_win32()
+        elif sys.platform == "darwin":
+            cpu_count_physical = _count_physical_cores_darwin()
+        else:
+            raise NotImplementedError(f"unsupported platform: {sys.platform}")
+
+        # if cpu_count_physical < 1, we did not find a valid value
+        if cpu_count_physical < 1:
+            raise ValueError(f"found {cpu_count_physical} physical cores < 1")
+
+    except Exception as e:
+        exception = e
+        cpu_count_physical = "not found"
+
+    # Put the result in cache
+    physical_cores_cache = cpu_count_physical
+
+    return cpu_count_physical, exception
+
+
+def _count_physical_cores_linux():
+    try:
+        cpu_info = subprocess.run(
+            "lscpu --parse=core".split(), capture_output=True, text=True
+        )
+        cpu_info = cpu_info.stdout.splitlines()
+        cpu_info = {line for line in cpu_info if not line.startswith("#")}
+        return len(cpu_info)
+    except:
+        pass  # fallback to /proc/cpuinfo
+
+    cpu_info = subprocess.run(
+        "cat /proc/cpuinfo".split(), capture_output=True, text=True
+    )
+    cpu_info = cpu_info.stdout.splitlines()
+    cpu_info = {line for line in cpu_info if line.startswith("core id")}
+    return len(cpu_info)
+
+
+def _count_physical_cores_win32():
+    try:
+        cmd = "-Command (Get-CimInstance -ClassName Win32_Processor).NumberOfCores"
+        cpu_info = subprocess.run(
+            f"powershell.exe {cmd}".split(),
+            capture_output=True,
+            text=True,
+        )
+        cpu_info = cpu_info.stdout.splitlines()
+        return int(cpu_info[0])
+    except:
+        pass  # fallback to wmic (older Windows versions; deprecated now)
+
+    cpu_info = subprocess.run(
+        "wmic CPU Get NumberOfCores /Format:csv".split(),
+        capture_output=True,
+        text=True,
+    )
+    cpu_info = cpu_info.stdout.splitlines()
+    cpu_info = [
+        l.split(",")[1] for l in cpu_info if (l and l != "Node,NumberOfCores")
+    ]
+    return sum(map(int, cpu_info))
+
+
+def _count_physical_cores_darwin():
+    cpu_info = subprocess.run(
+        "sysctl -n hw.physicalcpu".split(),
+        capture_output=True,
+        text=True,
+    )
+    cpu_info = cpu_info.stdout
+    return int(cpu_info)
+
+
+class LokyContext(BaseContext):
+    """Context relying on the LokyProcess."""
+
+    _name = "loky"
+    Process = LokyProcess
+    cpu_count = staticmethod(cpu_count)
+
+    def Queue(self, maxsize=0, reducers=None):
+        """Returns a queue object"""
+        from .queues import Queue
+
+        return Queue(maxsize, reducers=reducers, ctx=self.get_context())
+
+    def SimpleQueue(self, reducers=None):
+        """Returns a queue object"""
+        from .queues import SimpleQueue
+
+        return SimpleQueue(reducers=reducers, ctx=self.get_context())
+
+    if sys.platform != "win32":
+        """For Unix platform, use our custom implementation of synchronize
+        ensuring that we use the loky.backend.resource_tracker to clean-up
+        the semaphores in case of a worker crash.
+        """
+
+        def Semaphore(self, value=1):
+            """Returns a semaphore object"""
+            from .synchronize import Semaphore
+
+            return Semaphore(value=value)
+
+        def BoundedSemaphore(self, value):
+            """Returns a bounded semaphore object"""
+            from .synchronize import BoundedSemaphore
+
+            return BoundedSemaphore(value)
+
+        def Lock(self):
+            """Returns a lock object"""
+            from .synchronize import Lock
+
+            return Lock()
+
+        def RLock(self):
+            """Returns a recurrent lock object"""
+            from .synchronize import RLock
+
+            return RLock()
+
+        def Condition(self, lock=None):
+            """Returns a condition object"""
+            from .synchronize import Condition
+
+            return Condition(lock)
+
+        def Event(self):
+            """Returns an event object"""
+            from .synchronize import Event
+
+            return Event()
+
+
+class LokyInitMainContext(LokyContext):
+    """Extra context with LokyProcess, which does load the main module
+
+    This context is used for compatibility in the case ``cloudpickle`` is not
+    present on the running system. This permits to load functions defined in
+    the ``main`` module, using proper safeguards. The declaration of the
+    ``executor`` should be protected by ``if __name__ == "__main__":`` and the
+    functions and variable used from main should be out of this block.
+
+    This mimics the default behavior of multiprocessing under Windows and the
+    behavior of the ``spawn`` start method on a posix system.
+    For more details, see the end of the following section of python doc
+    https://docs.python.org/3/library/multiprocessing.html#multiprocessing-programming
+    """
+
+    _name = "loky_init_main"
+    Process = LokyInitMainProcess
+
+
+# Register loky context so it works with multiprocessing.get_context
+ctx_loky = LokyContext()
+mp.context._concrete_contexts["loky"] = ctx_loky
+mp.context._concrete_contexts["loky_init_main"] = LokyInitMainContext()

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/fork_exec.py

@@ -0,0 +1,73 @@
+###############################################################################
+# Launch a subprocess using forkexec and make sure only the needed fd are
+# shared in the two process.
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+import sys
+import os
+import subprocess
+
+
+def fork_exec(cmd, keep_fds, env=None):
+    import _posixsubprocess
+
+    # Encoded command args as bytes:
+    cmd = [os.fsencode(arg) for arg in cmd]
+
+    # Copy the environment variables to set in the child process (also encoded
+    # as bytes).
+    env = env or {}
+    env = {**os.environ, **env}
+    encoded_env = []
+    for key, value in env.items():
+        encoded_env.append(os.fsencode(f"{key}={value}"))
+
+    # Fds with fileno larger than 3 (stdin=0, stdout=1, stderr=2) are be closed
+    # in the child process, except for those passed in keep_fds.
+    keep_fds = tuple(sorted(map(int, keep_fds)))
+    errpipe_read, errpipe_write = os.pipe()
+
+    if sys.version_info >= (3, 14):
+        # Python >= 3.14 removed allow_vfork from _posixsubprocess.fork_exec,
+        # see https://github.com/python/cpython/pull/121383
+        pgid_to_set = [-1]
+        allow_vfork = []
+    elif sys.version_info >= (3, 11):
+        # Python 3.11 - 3.13 has allow_vfork in _posixsubprocess.fork_exec
+        pgid_to_set = [-1]
+        allow_vfork = [subprocess._USE_VFORK]
+    else:
+        # Python < 3.11
+        pgid_to_set = []
+        allow_vfork = []
+
+    try:
+        return _posixsubprocess.fork_exec(
+            cmd,  # args
+            cmd[0:1],  # executable_list
+            True,  # close_fds
+            keep_fds,  # pass_fds
+            None,  # cwd
+            encoded_env,  # env
+            -1,  # p2cread
+            -1,  # p2cwrite
+            -1,  # c2pread
+            -1,  # c2pwrite
+            -1,  # errread
+            -1,  # errwrite
+            errpipe_read,  # errpipe_read
+            errpipe_write,  # errpipe_write
+            False,  # restore_signal
+            False,  # call_setsid
+            *pgid_to_set,  # pgid_to_set
+            None,  # gid
+            None,  # extra_groups
+            None,  # uid
+            -1,  # child_umask
+            None,  # preexec_fn
+            *allow_vfork,  # extra flag if vfork is available
+        )
+    finally:
+        os.close(errpipe_read)
+        os.close(errpipe_write)

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/popen_loky_posix.py

@@ -0,0 +1,193 @@
+###############################################################################
+# Popen for LokyProcess.
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+import os
+import sys
+import signal
+import pickle
+from io import BytesIO
+from multiprocessing import util, process
+from multiprocessing.connection import wait
+from multiprocessing.context import set_spawning_popen
+
+from . import reduction, resource_tracker, spawn
+
+
+__all__ = ["Popen"]
+
+
+#
+# Wrapper for an fd used while launching a process
+#
+
+
+class _DupFd:
+    def __init__(self, fd):
+        self.fd = reduction._mk_inheritable(fd)
+
+    def detach(self):
+        return self.fd
+
+
+#
+# Start child process using subprocess.Popen
+#
+
+
+class Popen:
+    method = "loky"
+    DupFd = _DupFd
+
+    def __init__(self, process_obj):
+        sys.stdout.flush()
+        sys.stderr.flush()
+        self.returncode = None
+        self._fds = []
+        self._launch(process_obj)
+
+    def duplicate_for_child(self, fd):
+        self._fds.append(fd)
+        return reduction._mk_inheritable(fd)
+
+    def poll(self, flag=os.WNOHANG):
+        if self.returncode is None:
+            while True:
+                try:
+                    pid, sts = os.waitpid(self.pid, flag)
+                except OSError:
+                    # Child process not yet created. See #1731717
+                    # e.errno == errno.ECHILD == 10
+                    return None
+                else:
+                    break
+            if pid == self.pid:
+                if os.WIFSIGNALED(sts):
+                    self.returncode = -os.WTERMSIG(sts)
+                else:
+                    assert os.WIFEXITED(sts)
+                    self.returncode = os.WEXITSTATUS(sts)
+        return self.returncode
+
+    def wait(self, timeout=None):
+        if self.returncode is None:
+            if timeout is not None:
+                if not wait([self.sentinel], timeout):
+                    return None
+            # This shouldn't block if wait() returned successfully.
+            return self.poll(os.WNOHANG if timeout == 0.0 else 0)
+        return self.returncode
+
+    def terminate(self):
+        if self.returncode is None:
+            try:
+                os.kill(self.pid, signal.SIGTERM)
+            except ProcessLookupError:
+                pass
+            except OSError:
+                if self.wait(timeout=0.1) is None:
+                    raise
+
+    def _launch(self, process_obj):
+
+        tracker_fd = resource_tracker._resource_tracker.getfd()
+
+        fp = BytesIO()
+        set_spawning_popen(self)
+        try:
+            prep_data = spawn.get_preparation_data(
+                process_obj._name,
+                getattr(process_obj, "init_main_module", True),
+            )
+            reduction.dump(prep_data, fp)
+            reduction.dump(process_obj, fp)
+
+        finally:
+            set_spawning_popen(None)
+
+        try:
+            parent_r, child_w = os.pipe()
+            child_r, parent_w = os.pipe()
+            # for fd in self._fds:
+            #     _mk_inheritable(fd)
+
+            cmd_python = [sys.executable]
+            cmd_python += ["-m", self.__module__]
+            cmd_python += ["--process-name", str(process_obj.name)]
+            cmd_python += ["--pipe", str(reduction._mk_inheritable(child_r))]
+            reduction._mk_inheritable(child_w)
+            reduction._mk_inheritable(tracker_fd)
+            self._fds += [child_r, child_w, tracker_fd]
+            if os.name == "posix":
+                mp_tracker_fd = prep_data["mp_tracker_fd"]
+                self.duplicate_for_child(mp_tracker_fd)
+
+            from .fork_exec import fork_exec
+
+            pid = fork_exec(cmd_python, self._fds, env=process_obj.env)
+            util.debug(
+                f"launched python with pid {pid} and cmd:\n{cmd_python}"
+            )
+            self.sentinel = parent_r
+
+            method = "getbuffer"
+            if not hasattr(fp, method):
+                method = "getvalue"
+            with os.fdopen(parent_w, "wb") as f:
+                f.write(getattr(fp, method)())
+            self.pid = pid
+        finally:
+            if parent_r is not None:
+                util.Finalize(self, os.close, (parent_r,))
+            for fd in (child_r, child_w):
+                if fd is not None:
+                    os.close(fd)
+
+    @staticmethod
+    def thread_is_spawning():
+        return True
+
+
+if __name__ == "__main__":
+    import argparse
+
+    parser = argparse.ArgumentParser("Command line parser")
+    parser.add_argument(
+        "--pipe", type=int, required=True, help="File handle for the pipe"
+    )
+    parser.add_argument(
+        "--process-name",
+        type=str,
+        default=None,
+        help="Identifier for debugging purpose",
+    )
+
+    args = parser.parse_args()
+
+    info = {}
+    exitcode = 1
+    try:
+        with os.fdopen(args.pipe, "rb") as from_parent:
+            process.current_process()._inheriting = True
+            try:
+                prep_data = pickle.load(from_parent)
+                spawn.prepare(prep_data)
+                process_obj = pickle.load(from_parent)
+            finally:
+                del process.current_process()._inheriting
+
+        exitcode = process_obj._bootstrap()
+    except Exception:
+        print("\n\n" + "-" * 80)
+        print(f"{args.process_name} failed with traceback: ")
+        print("-" * 80)
+        import traceback
+
+        print(traceback.format_exc())
+        print("\n" + "-" * 80)
+    finally:
+        if from_parent is not None:
+            from_parent.close()
+
+        sys.exit(exitcode)

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/popen_loky_win32.py

@@ -0,0 +1,173 @@
+import os
+import sys
+import msvcrt
+import _winapi
+from pickle import load
+from multiprocessing import process, util
+from multiprocessing.context import set_spawning_popen
+from multiprocessing.popen_spawn_win32 import Popen as _Popen
+
+from . import reduction, spawn
+
+
+__all__ = ["Popen"]
+
+#
+#
+#
+
+
+def _path_eq(p1, p2):
+    return p1 == p2 or os.path.normcase(p1) == os.path.normcase(p2)
+
+
+WINENV = hasattr(sys, "_base_executable") and not _path_eq(
+    sys.executable, sys._base_executable
+)
+
+
+def _close_handles(*handles):
+    for handle in handles:
+        _winapi.CloseHandle(handle)
+
+
+#
+# We define a Popen class similar to the one from subprocess, but
+# whose constructor takes a process object as its argument.
+#
+
+
+class Popen(_Popen):
+    """
+    Start a subprocess to run the code of a process object.
+
+    We differ from cpython implementation with the way we handle environment
+    variables, in order to be able to modify then in the child processes before
+    importing any library, in order to control the number of threads in C-level
+    threadpools.
+
+    We also use the loky preparation data, in particular to handle main_module
+    inits and the loky resource tracker.
+    """
+
+    method = "loky"
+
+    def __init__(self, process_obj):
+        prep_data = spawn.get_preparation_data(
+            process_obj._name, getattr(process_obj, "init_main_module", True)
+        )
+
+        # read end of pipe will be duplicated by the child process
+        # -- see spawn_main() in spawn.py.
+        #
+        # bpo-33929: Previously, the read end of pipe was "stolen" by the child
+        # process, but it leaked a handle if the child process had been
+        # terminated before it could steal the handle from the parent process.
+        rhandle, whandle = _winapi.CreatePipe(None, 0)
+        wfd = msvcrt.open_osfhandle(whandle, 0)
+        cmd = get_command_line(parent_pid=os.getpid(), pipe_handle=rhandle)
+
+        python_exe = spawn.get_executable()
+
+        # copy the environment variables to set in the child process
+        child_env = {**os.environ, **process_obj.env}
+
+        # bpo-35797: When running in a venv, we bypass the redirect
+        # executor and launch our base Python.
+        if WINENV and _path_eq(python_exe, sys.executable):
+            cmd[0] = python_exe = sys._base_executable
+            child_env["__PYVENV_LAUNCHER__"] = sys.executable
+
+        cmd = " ".join(f'"{x}"' for x in cmd)
+
+        with open(wfd, "wb") as to_child:
+            # start process
+            try:
+                hp, ht, pid, _ = _winapi.CreateProcess(
+                    python_exe,
+                    cmd,
+                    None,
+                    None,
+                    False,
+                    0,
+                    child_env,
+                    None,
+                    None,
+                )
+                _winapi.CloseHandle(ht)
+            except BaseException:
+                _winapi.CloseHandle(rhandle)
+                raise
+
+            # set attributes of self
+            self.pid = pid
+            self.returncode = None
+            self._handle = hp
+            self.sentinel = int(hp)
+            self.finalizer = util.Finalize(
+                self, _close_handles, (self.sentinel, int(rhandle))
+            )
+
+            # send information to child
+            set_spawning_popen(self)
+            try:
+                reduction.dump(prep_data, to_child)
+                reduction.dump(process_obj, to_child)
+            finally:
+                set_spawning_popen(None)
+
+
+def get_command_line(pipe_handle, parent_pid, **kwds):
+    """Returns prefix of command line used for spawning a child process."""
+    if getattr(sys, "frozen", False):
+        return [sys.executable, "--multiprocessing-fork", pipe_handle]
+    else:
+        prog = (
+            "from joblib.externals.loky.backend.popen_loky_win32 import main; "
+            f"main(pipe_handle={pipe_handle}, parent_pid={parent_pid})"
+        )
+        opts = util._args_from_interpreter_flags()
+        return [
+            spawn.get_executable(),
+            *opts,
+            "-c",
+            prog,
+            "--multiprocessing-fork",
+        ]
+
+
+def is_forking(argv):
+    """Return whether commandline indicates we are forking."""
+    if len(argv) >= 2 and argv[1] == "--multiprocessing-fork":
+        return True
+    else:
+        return False
+
+
+def main(pipe_handle, parent_pid=None):
+    """Run code specified by data received over pipe."""
+    assert is_forking(sys.argv), "Not forking"
+
+    if parent_pid is not None:
+        source_process = _winapi.OpenProcess(
+            _winapi.SYNCHRONIZE | _winapi.PROCESS_DUP_HANDLE, False, parent_pid
+        )
+    else:
+        source_process = None
+    new_handle = reduction.duplicate(
+        pipe_handle, source_process=source_process
+    )
+    fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
+    parent_sentinel = source_process
+
+    with os.fdopen(fd, "rb", closefd=True) as from_parent:
+        process.current_process()._inheriting = True
+        try:
+            preparation_data = load(from_parent)
+            spawn.prepare(preparation_data, parent_sentinel)
+            self = load(from_parent)
+        finally:
+            del process.current_process()._inheriting
+
+    exitcode = self._bootstrap(parent_sentinel)
+    sys.exit(exitcode)

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/process.py

@@ -0,0 +1,85 @@
+###############################################################################
+# LokyProcess implementation
+#
+# authors: Thomas Moreau and Olivier Grisel
+#
+# based on multiprocessing/process.py  (17/02/2017)
+#
+import sys
+from multiprocessing.context import assert_spawning
+from multiprocessing.process import BaseProcess
+
+
+class LokyProcess(BaseProcess):
+    _start_method = "loky"
+
+    def __init__(
+        self,
+        group=None,
+        target=None,
+        name=None,
+        args=(),
+        kwargs={},
+        daemon=None,
+        init_main_module=False,
+        env=None,
+    ):
+        super().__init__(
+            group=group,
+            target=target,
+            name=name,
+            args=args,
+            kwargs=kwargs,
+            daemon=daemon,
+        )
+        self.env = {} if env is None else env
+        self.authkey = self.authkey
+        self.init_main_module = init_main_module
+
+    @staticmethod
+    def _Popen(process_obj):
+        if sys.platform == "win32":
+            from .popen_loky_win32 import Popen
+        else:
+            from .popen_loky_posix import Popen
+        return Popen(process_obj)
+
+
+class LokyInitMainProcess(LokyProcess):
+    _start_method = "loky_init_main"
+
+    def __init__(
+        self,
+        group=None,
+        target=None,
+        name=None,
+        args=(),
+        kwargs={},
+        daemon=None,
+    ):
+        super().__init__(
+            group=group,
+            target=target,
+            name=name,
+            args=args,
+            kwargs=kwargs,
+            daemon=daemon,
+            init_main_module=True,
+        )
+
+
+#
+# We subclass bytes to avoid accidental transmission of auth keys over network
+#
+
+
+class AuthenticationKey(bytes):
+    def __reduce__(self):
+        try:
+            assert_spawning(self)
+        except RuntimeError:
+            raise TypeError(
+                "Pickling an AuthenticationKey object is "
+                "disallowed for security reasons"
+            )
+        return AuthenticationKey, (bytes(self),)

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/queues.py

@@ -0,0 +1,236 @@
+###############################################################################
+# Queue and SimpleQueue implementation for loky
+#
+# authors: Thomas Moreau, Olivier Grisel
+#
+# based on multiprocessing/queues.py (16/02/2017)
+# * Add some custom reducers for the Queues/SimpleQueue to tweak the
+#   pickling process. (overload Queue._feed/SimpleQueue.put)
+#
+import os
+import sys
+import errno
+import weakref
+import threading
+from multiprocessing import util
+from multiprocessing.queues import (
+    Full,
+    Queue as mp_Queue,
+    SimpleQueue as mp_SimpleQueue,
+    _sentinel,
+)
+from multiprocessing.context import assert_spawning
+
+from .reduction import dumps
+
+
+__all__ = ["Queue", "SimpleQueue", "Full"]
+
+
+class Queue(mp_Queue):
+    def __init__(self, maxsize=0, reducers=None, ctx=None):
+        super().__init__(maxsize=maxsize, ctx=ctx)
+        self._reducers = reducers
+
+    # Use custom queue set/get state to be able to reduce the custom reducers
+    def __getstate__(self):
+        assert_spawning(self)
+        return (
+            self._ignore_epipe,
+            self._maxsize,
+            self._reader,
+            self._writer,
+            self._reducers,
+            self._rlock,
+            self._wlock,
+            self._sem,
+            self._opid,
+        )
+
+    def __setstate__(self, state):
+        (
+            self._ignore_epipe,
+            self._maxsize,
+            self._reader,
+            self._writer,
+            self._reducers,
+            self._rlock,
+            self._wlock,
+            self._sem,
+            self._opid,
+        ) = state
+        if sys.version_info >= (3, 9):
+            self._reset()
+        else:
+            self._after_fork()
+
+    # Overload _start_thread to correctly call our custom _feed
+    def _start_thread(self):
+        util.debug("Queue._start_thread()")
+
+        # Start thread which transfers data from buffer to pipe
+        self._buffer.clear()
+        self._thread = threading.Thread(
+            target=Queue._feed,
+            args=(
+                self._buffer,
+                self._notempty,
+                self._send_bytes,
+                self._wlock,
+                self._writer.close,
+                self._reducers,
+                self._ignore_epipe,
+                self._on_queue_feeder_error,
+                self._sem,
+            ),
+            name="QueueFeederThread",
+        )
+        self._thread.daemon = True
+
+        util.debug("doing self._thread.start()")
+        self._thread.start()
+        util.debug("... done self._thread.start()")
+
+        # On process exit we will wait for data to be flushed to pipe.
+        #
+        # However, if this process created the queue then all
+        # processes which use the queue will be descendants of this
+        # process.  Therefore waiting for the queue to be flushed
+        # is pointless once all the child processes have been joined.
+        created_by_this_process = self._opid == os.getpid()
+        if not self._joincancelled and not created_by_this_process:
+            self._jointhread = util.Finalize(
+                self._thread,
+                Queue._finalize_join,
+                [weakref.ref(self._thread)],
+                exitpriority=-5,
+            )
+
+        # Send sentinel to the thread queue object when garbage collected
+        self._close = util.Finalize(
+            self,
+            Queue._finalize_close,
+            [self._buffer, self._notempty],
+            exitpriority=10,
+        )
+
+    # Overload the _feed methods to use our custom pickling strategy.
+    @staticmethod
+    def _feed(
+        buffer,
+        notempty,
+        send_bytes,
+        writelock,
+        close,
+        reducers,
+        ignore_epipe,
+        onerror,
+        queue_sem,
+    ):
+        util.debug("starting thread to feed data to pipe")
+        nacquire = notempty.acquire
+        nrelease = notempty.release
+        nwait = notempty.wait
+        bpopleft = buffer.popleft
+        sentinel = _sentinel
+        if sys.platform != "win32":
+            wacquire = writelock.acquire
+            wrelease = writelock.release
+        else:
+            wacquire = None
+
+        while True:
+            try:
+                nacquire()
+                try:
+                    if not buffer:
+                        nwait()
+                finally:
+                    nrelease()
+                try:
+                    while True:
+                        obj = bpopleft()
+                        if obj is sentinel:
+                            util.debug("feeder thread got sentinel -- exiting")
+                            close()
+                            return
+
+                        # serialize the data before acquiring the lock
+                        obj_ = dumps(obj, reducers=reducers)
+                        if wacquire is None:
+                            send_bytes(obj_)
+                        else:
+                            wacquire()
+                            try:
+                                send_bytes(obj_)
+                            finally:
+                                wrelease()
+                        # Remove references early to avoid leaking memory
+                        del obj, obj_
+                except IndexError:
+                    pass
+            except BaseException as e:
+                if ignore_epipe and getattr(e, "errno", 0) == errno.EPIPE:
+                    return
+                # Since this runs in a daemon thread the resources it uses
+                # may be become unusable while the process is cleaning up.
+                # We ignore errors which happen after the process has
+                # started to cleanup.
+                if util.is_exiting():
+                    util.info(f"error in queue thread: {e}")
+                    return
+                else:
+                    queue_sem.release()
+                    onerror(e, obj)
+
+    def _on_queue_feeder_error(self, e, obj):
+        """
+        Private API hook called when feeding data in the background thread
+        raises an exception.  For overriding by concurrent.futures.
+        """
+        import traceback
+
+        traceback.print_exc()
+
+
+class SimpleQueue(mp_SimpleQueue):
+    def __init__(self, reducers=None, ctx=None):
+        super().__init__(ctx=ctx)
+
+        # Add possiblity to use custom reducers
+        self._reducers = reducers
+
+    def close(self):
+        self._reader.close()
+        self._writer.close()
+
+    # Use custom queue set/get state to be able to reduce the custom reducers
+    def __getstate__(self):
+        assert_spawning(self)
+        return (
+            self._reader,
+            self._writer,
+            self._reducers,
+            self._rlock,
+            self._wlock,
+        )
+
+    def __setstate__(self, state):
+        (
+            self._reader,
+            self._writer,
+            self._reducers,
+            self._rlock,
+            self._wlock,
+        ) = state
+
+    # Overload put to use our customizable reducer
+    def put(self, obj):
+        # serialize the data before acquiring the lock
+        obj = dumps(obj, reducers=self._reducers)
+        if self._wlock is None:
+            # writes to a message oriented win32 pipe are atomic
+            self._writer.send_bytes(obj)
+        else:
+            with self._wlock:
+                self._writer.send_bytes(obj)

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/reduction.py

@@ -0,0 +1,223 @@
+###############################################################################
+# Customizable Pickler with some basic reducers
+#
+# author: Thomas Moreau
+#
+# adapted from multiprocessing/reduction.py (17/02/2017)
+#  * Replace the ForkingPickler with a similar _LokyPickler,
+#  * Add CustomizableLokyPickler to allow customizing pickling process
+#    on the fly.
+#
+import copyreg
+import io
+import functools
+import types
+import sys
+import os
+
+from multiprocessing import util
+from pickle import loads, HIGHEST_PROTOCOL
+
+###############################################################################
+# Enable custom pickling in Loky.
+
+_dispatch_table = {}
+
+
+def register(type_, reduce_function):
+    _dispatch_table[type_] = reduce_function
+
+
+###############################################################################
+# Registers extra pickling routines to improve picklization  for loky
+
+
+# make methods picklable
+def _reduce_method(m):
+    if m.__self__ is None:
+        return getattr, (m.__class__, m.__func__.__name__)
+    else:
+        return getattr, (m.__self__, m.__func__.__name__)
+
+
+class _C:
+    def f(self):
+        pass
+
+    @classmethod
+    def h(cls):
+        pass
+
+
+register(type(_C().f), _reduce_method)
+register(type(_C.h), _reduce_method)
+
+
+def _reduce_method_descriptor(m):
+    return getattr, (m.__objclass__, m.__name__)
+
+
+register(type(list.append), _reduce_method_descriptor)
+register(type(int.__add__), _reduce_method_descriptor)
+
+
+# Make partial func pickable
+def _reduce_partial(p):
+    return _rebuild_partial, (p.func, p.args, p.keywords or {})
+
+
+def _rebuild_partial(func, args, keywords):
+    return functools.partial(func, *args, **keywords)
+
+
+register(functools.partial, _reduce_partial)
+
+if sys.platform != "win32":
+    from ._posix_reduction import _mk_inheritable  # noqa: F401
+else:
+    from . import _win_reduction  # noqa: F401
+
+# global variable to change the pickler behavior
+try:
+    from joblib.externals import cloudpickle  # noqa: F401
+
+    DEFAULT_ENV = "cloudpickle"
+except ImportError:
+    # If cloudpickle is not present, fallback to pickle
+    DEFAULT_ENV = "pickle"
+
+ENV_LOKY_PICKLER = os.environ.get("LOKY_PICKLER", DEFAULT_ENV)
+_LokyPickler = None
+_loky_pickler_name = None
+
+
+def set_loky_pickler(loky_pickler=None):
+    global _LokyPickler, _loky_pickler_name
+
+    if loky_pickler is None:
+        loky_pickler = ENV_LOKY_PICKLER
+
+    loky_pickler_cls = None
+
+    # The default loky_pickler is cloudpickle
+    if loky_pickler in ["", None]:
+        loky_pickler = "cloudpickle"
+
+    if loky_pickler == _loky_pickler_name:
+        return
+
+    if loky_pickler == "cloudpickle":
+        from joblib.externals.cloudpickle import CloudPickler as loky_pickler_cls
+    else:
+        try:
+            from importlib import import_module
+
+            module_pickle = import_module(loky_pickler)
+            loky_pickler_cls = module_pickle.Pickler
+        except (ImportError, AttributeError) as e:
+            extra_info = (
+                "\nThis error occurred while setting loky_pickler to"
+                f" '{loky_pickler}', as required by the env variable "
+                "LOKY_PICKLER or the function set_loky_pickler."
+            )
+            e.args = (e.args[0] + extra_info,) + e.args[1:]
+            e.msg = e.args[0]
+            raise e
+
+    util.debug(
+        f"Using '{loky_pickler if loky_pickler else 'cloudpickle'}' for "
+        "serialization."
+    )
+
+    class CustomizablePickler(loky_pickler_cls):
+        _loky_pickler_cls = loky_pickler_cls
+
+        def _set_dispatch_table(self, dispatch_table):
+            for ancestor_class in self._loky_pickler_cls.mro():
+                dt_attribute = getattr(ancestor_class, "dispatch_table", None)
+                if isinstance(dt_attribute, types.MemberDescriptorType):
+                    # Ancestor class (typically _pickle.Pickler) has a
+                    # member_descriptor for its "dispatch_table" attribute. Use
+                    # it to set the dispatch_table as a member instead of a
+                    # dynamic attribute in the __dict__ of the instance,
+                    # otherwise it will not be taken into account by the C
+                    # implementation of the dump method if a subclass defines a
+                    # class-level dispatch_table attribute as was done in
+                    # cloudpickle 1.6.0:
+                    # https://github.com/joblib/loky/pull/260
+                    dt_attribute.__set__(self, dispatch_table)
+                    break
+
+            # On top of member descriptor set, also use setattr such that code
+            # that directly access self.dispatch_table gets a consistent view
+            # of the same table.
+            self.dispatch_table = dispatch_table
+
+        def __init__(self, writer, reducers=None, protocol=HIGHEST_PROTOCOL):
+            loky_pickler_cls.__init__(self, writer, protocol=protocol)
+            if reducers is None:
+                reducers = {}
+
+            if hasattr(self, "dispatch_table"):
+                # Force a copy that we will update without mutating the
+                # any class level defined dispatch_table.
+                loky_dt = dict(self.dispatch_table)
+            else:
+                # Use standard reducers as bases
+                loky_dt = copyreg.dispatch_table.copy()
+
+            # Register loky specific reducers
+            loky_dt.update(_dispatch_table)
+
+            # Set the new dispatch table, taking care of the fact that we
+            # need to use the member_descriptor when we inherit from a
+            # subclass of the C implementation of the Pickler base class
+            # with an class level dispatch_table attribute.
+            self._set_dispatch_table(loky_dt)
+
+            # Register the reducers
+            for type, reduce_func in reducers.items():
+                self.register(type, reduce_func)
+
+        def register(self, type, reduce_func):
+            """Attach a reducer function to a given type in the dispatch table."""
+            self.dispatch_table[type] = reduce_func
+
+    _LokyPickler = CustomizablePickler
+    _loky_pickler_name = loky_pickler
+
+
+def get_loky_pickler_name():
+    global _loky_pickler_name
+    return _loky_pickler_name
+
+
+def get_loky_pickler():
+    global _LokyPickler
+    return _LokyPickler
+
+
+# Set it to its default value
+set_loky_pickler()
+
+
+def dump(obj, file, reducers=None, protocol=None):
+    """Replacement for pickle.dump() using _LokyPickler."""
+    global _LokyPickler
+    _LokyPickler(file, reducers=reducers, protocol=protocol).dump(obj)
+
+
+def dumps(obj, reducers=None, protocol=None):
+    global _LokyPickler
+
+    buf = io.BytesIO()
+    dump(obj, buf, reducers=reducers, protocol=protocol)
+    return buf.getbuffer()
+
+
+__all__ = ["dump", "dumps", "loads", "register", "set_loky_pickler"]
+
+if sys.platform == "win32":
+    from multiprocessing.reduction import duplicate
+
+    __all__ += ["duplicate"]

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/resource_tracker.py

@@ -0,0 +1,411 @@
+###############################################################################
+# Server process to keep track of unlinked resources, like folders and
+# semaphores and clean them.
+#
+# author: Thomas Moreau
+#
+# Adapted from multiprocessing/resource_tracker.py
+#  * add some VERBOSE logging,
+#  * add support to track folders,
+#  * add Windows support,
+#  * refcounting scheme to avoid unlinking resources still in use.
+#
+# On Unix we run a server process which keeps track of unlinked
+# resources. The server ignores SIGINT and SIGTERM and reads from a
+# pipe. The resource_tracker implements a reference counting scheme: each time
+# a Python process anticipates the shared usage of a resource by another
+# process, it signals the resource_tracker of this shared usage, and in return,
+# the resource_tracker increments the resource's reference count by 1.
+# Similarly, when access to a resource is closed by a Python process, the
+# process notifies the resource_tracker by asking it to decrement the
+# resource's reference count by 1.  When the reference count drops to 0, the
+# resource_tracker attempts to clean up the underlying resource.
+
+# Finally, every other process connected to the resource tracker has a copy of
+# the writable end of the pipe used to communicate with it, so the resource
+# tracker gets EOF when all other processes have exited. Then the
+# resource_tracker process unlinks any remaining leaked resources (with
+# reference count above 0)
+
+# For semaphores, this is important because the system only supports a limited
+# number of named semaphores, and they will not be automatically removed till
+# the next reboot.  Without this resource tracker process, "killall python"
+# would probably leave unlinked semaphores.
+
+# Note that this behavior differs from CPython's resource_tracker, which only
+# implements list of shared resources, and not a proper refcounting scheme.
+# Also, CPython's resource tracker will only attempt to cleanup those shared
+# resources once all processes connected to the resource tracker have exited.
+
+
+import os
+import shutil
+import sys
+import signal
+import warnings
+from multiprocessing import util
+from multiprocessing.resource_tracker import (
+    ResourceTracker as _ResourceTracker,
+)
+
+from . import spawn
+
+if sys.platform == "win32":
+    import _winapi
+    import msvcrt
+    from multiprocessing.reduction import duplicate
+
+
+__all__ = ["ensure_running", "register", "unregister"]
+
+_HAVE_SIGMASK = hasattr(signal, "pthread_sigmask")
+_IGNORED_SIGNALS = (signal.SIGINT, signal.SIGTERM)
+
+
+def cleanup_noop(name):
+    raise RuntimeError("noop should never be registered or cleaned up")
+
+
+_CLEANUP_FUNCS = {
+    "noop": cleanup_noop,
+    "folder": shutil.rmtree,
+    "file": os.unlink,
+}
+
+if os.name == "posix":
+    import _multiprocessing
+
+    # Use sem_unlink() to clean up named semaphores.
+    #
+    # sem_unlink() may be missing if the Python build process detected the
+    # absence of POSIX named semaphores. In that case, no named semaphores were
+    # ever opened, so no cleanup would be necessary.
+    if hasattr(_multiprocessing, "sem_unlink"):
+        _CLEANUP_FUNCS.update(
+            {
+                "semlock": _multiprocessing.sem_unlink,
+            }
+        )
+
+
+VERBOSE = False
+
+
+class ResourceTracker(_ResourceTracker):
+    """Resource tracker with refcounting scheme.
+
+    This class is an extension of the multiprocessing ResourceTracker class
+    which implements a reference counting scheme to avoid unlinking shared
+    resources still in use in other processes.
+
+    This feature is notably used by `joblib.Parallel` to share temporary
+    folders and memory mapped files between the main process and the worker
+    processes.
+
+    The actual implementation of the refcounting scheme is in the main
+    function, which is run in a dedicated process.
+    """
+
+    def maybe_unlink(self, name, rtype):
+        """Decrement the refcount of a resource, and delete it if it hits 0"""
+        self._send("MAYBE_UNLINK", name, rtype)
+
+    def ensure_running(self):
+        """Make sure that resource tracker process is running.
+
+        This can be run from any process.  Usually a child process will use
+        the resource created by its parent.
+
+        This function is necessary for backward compatibility with python
+        versions before 3.13.7.
+        """
+        return self._ensure_running_and_write()
+
+    def _teardown_dead_process(self):
+        # Override this function for compatibility with windows and
+        # for python version before 3.13.7
+
+        # At this point, the resource_tracker process has been killed
+        # or crashed.
+        os.close(self._fd)
+
+        # Let's remove the process entry from the process table on POSIX system
+        # to avoid zombie processes.
+        if os.name == "posix":
+            try:
+                # _pid can be None if this process is a child from another
+                # python process, which has started the resource_tracker.
+                if self._pid is not None:
+                    os.waitpid(self._pid, 0)
+            except OSError:
+                # The resource_tracker has already been terminated.
+                pass
+        self._fd = None
+        self._pid = None
+
+        warnings.warn(
+            "resource_tracker: process died unexpectedly, relaunching. "
+            "Some folders/semaphores might leak."
+        )
+
+    def _launch(self):
+        # This is the overridden part of the resource tracker, which launches
+        # loky's version, which is compatible with windows and allow to track
+        # folders with external ref counting.
+
+        fds_to_pass = []
+        try:
+            fds_to_pass.append(sys.stderr.fileno())
+        except Exception:
+            pass
+
+        # Create a pipe for posix and windows
+        r, w = os.pipe()
+        if sys.platform == "win32":
+            _r = duplicate(msvcrt.get_osfhandle(r), inheritable=True)
+            os.close(r)
+            r = _r
+
+        cmd = f"from {main.__module__} import main; main({r}, {VERBOSE})"
+        try:
+            fds_to_pass.append(r)
+            # process will out live us, so no need to wait on pid
+            exe = spawn.get_executable()
+            args = [exe, *util._args_from_interpreter_flags(), "-c", cmd]
+            util.debug(f"launching resource tracker: {args}")
+            # bpo-33613: Register a signal mask that will block the
+            # signals.  This signal mask will be inherited by the child
+            # that is going to be spawned and will protect the child from a
+            # race condition that can make the child die before it
+            # registers signal handlers for SIGINT and SIGTERM. The mask is
+            # unregistered after spawning the child.
+            try:
+                if _HAVE_SIGMASK:
+                    signal.pthread_sigmask(signal.SIG_BLOCK, _IGNORED_SIGNALS)
+                pid = spawnv_passfds(exe, args, fds_to_pass)
+            finally:
+                if _HAVE_SIGMASK:
+                    signal.pthread_sigmask(
+                        signal.SIG_UNBLOCK, _IGNORED_SIGNALS
+                    )
+        except BaseException:
+            os.close(w)
+            raise
+        else:
+            self._fd = w
+            self._pid = pid
+        finally:
+            if sys.platform == "win32":
+                _winapi.CloseHandle(r)
+            else:
+                os.close(r)
+
+    def _ensure_running_and_write(self, msg=None):
+        """Make sure that resource tracker process is running.
+
+        This can be run from any process.  Usually a child process will use
+        the resource created by its parent.
+
+
+        This function is added for compatibility with python version before 3.13.7.
+        """
+        with self._lock:
+            if (
+                self._fd is not None
+            ):  # resource tracker was launched before, is it still running?
+                if msg is None:
+                    to_send = b"PROBE:0:noop\n"
+                else:
+                    to_send = msg
+                try:
+                    self._write(to_send)
+                except OSError:
+                    self._teardown_dead_process()
+                    self._launch()
+
+                msg = None  # message was sent in probe
+            else:
+                self._launch()
+
+        if msg is not None:
+            self._write(msg)
+
+    def _write(self, msg):
+        nbytes = os.write(self._fd, msg)
+        assert nbytes == len(msg), f"{nbytes=} != {len(msg)=}"
+
+    def __del__(self):
+        # ignore error due to trying to clean up child process which has already been
+        # shutdown on windows. See https://github.com/joblib/loky/pull/450
+        # This is only required if __del__ is defined
+        if not hasattr(_ResourceTracker, "__del__"):
+            return
+        try:
+            super().__del__()
+        except ChildProcessError:
+            pass
+
+
+_resource_tracker = ResourceTracker()
+ensure_running = _resource_tracker.ensure_running
+register = _resource_tracker.register
+maybe_unlink = _resource_tracker.maybe_unlink
+unregister = _resource_tracker.unregister
+getfd = _resource_tracker.getfd
+
+
+def main(fd, verbose=0):
+    """Run resource tracker."""
+    if verbose:
+        util.log_to_stderr(level=util.DEBUG)
+
+    # protect the process from ^C and "killall python" etc
+    signal.signal(signal.SIGINT, signal.SIG_IGN)
+    signal.signal(signal.SIGTERM, signal.SIG_IGN)
+
+    if _HAVE_SIGMASK:
+        signal.pthread_sigmask(signal.SIG_UNBLOCK, _IGNORED_SIGNALS)
+
+    for f in (sys.stdin, sys.stdout):
+        try:
+            f.close()
+        except Exception:
+            pass
+
+    if verbose:
+        util.debug("Main resource tracker is running")
+
+    registry = {rtype: {} for rtype in _CLEANUP_FUNCS.keys()}
+
+    try:
+        if sys.platform == "win32":
+            fd = msvcrt.open_osfhandle(fd, os.O_RDONLY)
+        # keep track of registered/unregistered resources
+        with open(fd, "rb") as f:
+            for line in f:
+                try:
+                    splitted = line.strip().decode("ascii").split(":")
+                    # name can potentially contain separator symbols (for
+                    # instance folders on Windows)
+                    cmd, name, rtype = (
+                        splitted[0],
+                        ":".join(splitted[1:-1]),
+                        splitted[-1],
+                    )
+
+                    if rtype not in _CLEANUP_FUNCS:
+                        raise ValueError(
+                            f"Cannot register {name} for automatic cleanup: "
+                            f"unknown resource type ({rtype}). Resource type "
+                            "should be one of the following: "
+                            f"{list(_CLEANUP_FUNCS.keys())}"
+                        )
+
+                    if cmd == "PROBE":
+                        pass
+                    elif cmd == "REGISTER":
+                        if name not in registry[rtype]:
+                            registry[rtype][name] = 1
+                        else:
+                            registry[rtype][name] += 1
+
+                        if verbose:
+                            util.debug(
+                                "[ResourceTracker] incremented refcount of "
+                                f"{rtype} {name} "
+                                f"(current {registry[rtype][name]})"
+                            )
+                    elif cmd == "UNREGISTER":
+                        del registry[rtype][name]
+                        if verbose:
+                            util.debug(
+                                f"[ResourceTracker] unregister {name} {rtype}: "
+                                f"registry({len(registry)})"
+                            )
+                    elif cmd == "MAYBE_UNLINK":
+                        registry[rtype][name] -= 1
+                        if verbose:
+                            util.debug(
+                                "[ResourceTracker] decremented refcount of "
+                                f"{rtype} {name} "
+                                f"(current {registry[rtype][name]})"
+                            )
+
+                        if registry[rtype][name] == 0:
+                            del registry[rtype][name]
+                            try:
+                                if verbose:
+                                    util.debug(
+                                        f"[ResourceTracker] unlink {name}"
+                                    )
+                                _CLEANUP_FUNCS[rtype](name)
+                            except Exception as e:
+                                warnings.warn(
+                                    f"resource_tracker: {name}: {e!r}"
+                                )
+
+                    else:
+                        raise RuntimeError(f"unrecognized command {cmd!r}")
+                except BaseException:
+                    try:
+                        sys.excepthook(*sys.exc_info())
+                    except BaseException:
+                        pass
+    finally:
+        # all processes have terminated; cleanup any remaining resources
+        def _unlink_resources(rtype_registry, rtype):
+            if rtype_registry:
+                try:
+                    warnings.warn(
+                        "resource_tracker: There appear to be "
+                        f"{len(rtype_registry)} leaked {rtype} objects to "
+                        "clean up at shutdown"
+                    )
+                except Exception:
+                    pass
+            for name in rtype_registry:
+                # For some reason the process which created and registered this
+                # resource has failed to unregister it. Presumably it has
+                # died.  We therefore clean it up.
+                try:
+                    _CLEANUP_FUNCS[rtype](name)
+                    if verbose:
+                        util.debug(f"[ResourceTracker] unlink {name}")
+                except Exception as e:
+                    warnings.warn(f"resource_tracker: {name}: {e!r}")
+
+        for rtype, rtype_registry in registry.items():
+            if rtype == "folder":
+                continue
+            else:
+                _unlink_resources(rtype_registry, rtype)
+
+        # The default cleanup routine for folders deletes everything inside
+        # those folders recursively, which can include other resources tracked
+        # by the resource tracker). To limit the risk of the resource tracker
+        # attempting to delete twice a resource (once as part of a tracked
+        # folder, and once as a resource), we delete the folders after all
+        # other resource types.
+        if "folder" in registry:
+            _unlink_resources(registry["folder"], "folder")
+
+    if verbose:
+        util.debug("resource tracker shut down")
+
+
+def spawnv_passfds(path, args, passfds):
+    if sys.platform != "win32":
+        args = [arg.encode("utf-8") for arg in args]
+        path = path.encode("utf-8")
+        return util.spawnv_passfds(path, args, passfds)
+    else:
+        passfds = sorted(passfds)
+        cmd = " ".join(f'"{x}"' for x in args)
+        try:
+            _, ht, pid, _ = _winapi.CreateProcess(
+                path, cmd, None, None, True, 0, None, None, None
+            )
+            _winapi.CloseHandle(ht)
+        except BaseException:
+            pass
+        return pid

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/spawn.py

@@ -0,0 +1,244 @@
+###############################################################################
+# Prepares and processes the data to setup the new process environment
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+# adapted from multiprocessing/spawn.py (17/02/2017)
+#  * Improve logging data
+#
+import os
+import sys
+import runpy
+import textwrap
+import types
+from multiprocessing import process, util
+
+
+if sys.platform != "win32":
+    WINEXE = False
+    WINSERVICE = False
+else:
+    import msvcrt
+    from multiprocessing.reduction import duplicate
+
+    WINEXE = sys.platform == "win32" and getattr(sys, "frozen", False)
+    WINSERVICE = sys.executable.lower().endswith("pythonservice.exe")
+
+if WINSERVICE:
+    _python_exe = os.path.join(sys.exec_prefix, "python.exe")
+else:
+    _python_exe = sys.executable
+
+
+def get_executable():
+    return _python_exe
+
+
+def _check_not_importing_main():
+    if getattr(process.current_process(), "_inheriting", False):
+        raise RuntimeError(
+            textwrap.dedent(
+                """\
+            An attempt has been made to start a new process before the
+            current process has finished its bootstrapping phase.
+
+            This probably means that you are not using fork to start your
+            child processes and you have forgotten to use the proper idiom
+            in the main module:
+
+                if __name__ == '__main__':
+                    freeze_support()
+                    ...
+
+            The "freeze_support()" line can be omitted if the program
+            is not going to be frozen to produce an executable."""
+            )
+        )
+
+
+def get_preparation_data(name, init_main_module=True):
+    """Return info about parent needed by child to unpickle process object."""
+    _check_not_importing_main()
+    d = dict(
+        log_to_stderr=util._log_to_stderr,
+        authkey=bytes(process.current_process().authkey),
+        name=name,
+        sys_argv=sys.argv,
+        orig_dir=process.ORIGINAL_DIR,
+        dir=os.getcwd(),
+    )
+
+    # Send sys_path and make sure the current directory will not be changed
+    d["sys_path"] = [p if p != "" else process.ORIGINAL_DIR for p in sys.path]
+
+    # Make sure to pass the information if the multiprocessing logger is active
+    if util._logger is not None:
+        d["log_level"] = util._logger.getEffectiveLevel()
+        if util._logger.handlers:
+            h = util._logger.handlers[0]
+            d["log_fmt"] = h.formatter._fmt
+
+    # Tell the child how to communicate with the resource_tracker
+    from .resource_tracker import _resource_tracker
+
+    _resource_tracker.ensure_running()
+    if sys.platform == "win32":
+        d["tracker_fd"] = msvcrt.get_osfhandle(_resource_tracker._fd)
+    else:
+        d["tracker_fd"] = _resource_tracker._fd
+
+    if os.name == "posix":
+        # joblib/loky#242: allow loky processes to retrieve the resource
+        # tracker of their parent in case the child processes depickles
+        # shared_memory objects, that are still tracked by multiprocessing's
+        # resource_tracker by default.
+        # XXX: this is a workaround that may be error prone: in the future, it
+        # would be better to have loky subclass multiprocessing's shared_memory
+        # to force registration of shared_memory segments via loky's
+        # resource_tracker.
+        from multiprocessing.resource_tracker import (
+            _resource_tracker as mp_resource_tracker,
+        )
+
+        # multiprocessing's resource_tracker must be running before loky
+        # process is created (othewise the child won't be able to use it if it
+        # is created later on)
+        mp_resource_tracker.ensure_running()
+        d["mp_tracker_fd"] = mp_resource_tracker._fd
+
+    # Figure out whether to initialise main in the subprocess as a module
+    # or through direct execution (or to leave it alone entirely)
+    if init_main_module:
+        main_module = sys.modules["__main__"]
+        try:
+            main_mod_name = getattr(main_module.__spec__, "name", None)
+        except BaseException:
+            main_mod_name = None
+        if main_mod_name is not None:
+            d["init_main_from_name"] = main_mod_name
+        elif sys.platform != "win32" or (not WINEXE and not WINSERVICE):
+            main_path = getattr(main_module, "__file__", None)
+            if main_path is not None:
+                if (
+                    not os.path.isabs(main_path)
+                    and process.ORIGINAL_DIR is not None
+                ):
+                    main_path = os.path.join(process.ORIGINAL_DIR, main_path)
+                d["init_main_from_path"] = os.path.normpath(main_path)
+
+    return d
+
+
+#
+# Prepare current process
+#
+old_main_modules = []
+
+
+def prepare(data, parent_sentinel=None):
+    """Try to get current process ready to unpickle process object."""
+    if "name" in data:
+        process.current_process().name = data["name"]
+
+    if "authkey" in data:
+        process.current_process().authkey = data["authkey"]
+
+    if "log_to_stderr" in data and data["log_to_stderr"]:
+        util.log_to_stderr()
+
+    if "log_level" in data:
+        util.get_logger().setLevel(data["log_level"])
+
+    if "log_fmt" in data:
+        import logging
+
+        util.get_logger().handlers[0].setFormatter(
+            logging.Formatter(data["log_fmt"])
+        )
+
+    if "sys_path" in data:
+        sys.path = data["sys_path"]
+
+    if "sys_argv" in data:
+        sys.argv = data["sys_argv"]
+
+    if "dir" in data:
+        os.chdir(data["dir"])
+
+    if "orig_dir" in data:
+        process.ORIGINAL_DIR = data["orig_dir"]
+
+    if "mp_tracker_fd" in data:
+        from multiprocessing.resource_tracker import (
+            _resource_tracker as mp_resource_tracker,
+        )
+
+        mp_resource_tracker._fd = data["mp_tracker_fd"]
+    if "tracker_fd" in data:
+        from .resource_tracker import _resource_tracker
+
+        if sys.platform == "win32":
+            handle = data["tracker_fd"]
+            handle = duplicate(handle, source_process=parent_sentinel)
+            _resource_tracker._fd = msvcrt.open_osfhandle(handle, os.O_RDONLY)
+        else:
+            _resource_tracker._fd = data["tracker_fd"]
+
+    if "init_main_from_name" in data:
+        _fixup_main_from_name(data["init_main_from_name"])
+    elif "init_main_from_path" in data:
+        _fixup_main_from_path(data["init_main_from_path"])
+
+
+# Multiprocessing module helpers to fix up the main module in
+# spawned subprocesses
+def _fixup_main_from_name(mod_name):
+    # __main__.py files for packages, directories, zip archives, etc, run
+    # their "main only" code unconditionally, so we don't even try to
+    # populate anything in __main__, nor do we make any changes to
+    # __main__ attributes
+    current_main = sys.modules["__main__"]
+    if mod_name == "__main__" or mod_name.endswith(".__main__"):
+        return
+
+    # If this process was forked, __main__ may already be populated
+    if getattr(current_main.__spec__, "name", None) == mod_name:
+        return
+
+    # Otherwise, __main__ may contain some non-main code where we need to
+    # support unpickling it properly. We rerun it as __mp_main__ and make
+    # the normal __main__ an alias to that
+    old_main_modules.append(current_main)
+    main_module = types.ModuleType("__mp_main__")
+    main_content = runpy.run_module(
+        mod_name, run_name="__mp_main__", alter_sys=True
+    )
+    main_module.__dict__.update(main_content)
+    sys.modules["__main__"] = sys.modules["__mp_main__"] = main_module
+
+
+def _fixup_main_from_path(main_path):
+    # If this process was forked, __main__ may already be populated
+    current_main = sys.modules["__main__"]
+
+    # Unfortunately, the main ipython launch script historically had no
+    # "if __name__ == '__main__'" guard, so we work around that
+    # by treating it like a __main__.py file
+    # See https://github.com/ipython/ipython/issues/4698
+    main_name = os.path.splitext(os.path.basename(main_path))[0]
+    if main_name == "ipython":
+        return
+
+    # Otherwise, if __file__ already has the setting we expect,
+    # there's nothing more to do
+    if getattr(current_main, "__file__", None) == main_path:
+        return
+
+    # If the parent process has sent a path through rather than a module
+    # name we assume it is an executable script that may contain
+    # non-main code that needs to be executed
+    old_main_modules.append(current_main)
+    main_module = types.ModuleType("__mp_main__")
+    main_content = runpy.run_path(main_path, run_name="__mp_main__")
+    main_module.__dict__.update(main_content)
+    sys.modules["__main__"] = sys.modules["__mp_main__"] = main_module

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/synchronize.py

@@ -0,0 +1,409 @@
+###############################################################################
+# Synchronization primitives based on our SemLock implementation
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+# adapted from multiprocessing/synchronize.py (17/02/2017)
+#  * Remove ctx argument for compatibility reason
+#  * Registers a cleanup function with the loky resource_tracker to remove the
+#    semaphore when the process dies instead.
+#
+# TODO: investigate which Python version is required to be able to use
+# multiprocessing.resource_tracker and therefore multiprocessing.synchronize
+# instead of a loky-specific fork.
+
+import os
+import sys
+import tempfile
+import threading
+import _multiprocessing
+from time import time as _time
+from multiprocessing import process, util
+from multiprocessing.context import assert_spawning
+
+from . import resource_tracker
+
+__all__ = [
+    "Lock",
+    "RLock",
+    "Semaphore",
+    "BoundedSemaphore",
+    "Condition",
+    "Event",
+]
+# Try to import the mp.synchronize module cleanly, if it fails
+# raise ImportError for platforms lacking a working sem_open implementation.
+# See issue 3770
+try:
+    from _multiprocessing import SemLock as _SemLock
+    from _multiprocessing import sem_unlink
+except ImportError:
+    raise ImportError(
+        "This platform lacks a functioning sem_open"
+        " implementation, therefore, the required"
+        " synchronization primitives needed will not"
+        " function, see issue 3770."
+    )
+
+#
+# Constants
+#
+
+RECURSIVE_MUTEX, SEMAPHORE = range(2)
+SEM_VALUE_MAX = _multiprocessing.SemLock.SEM_VALUE_MAX
+
+
+#
+# Base class for semaphores and mutexes; wraps `_multiprocessing.SemLock`
+#
+
+
+class SemLock:
+
+    _rand = tempfile._RandomNameSequence()
+
+    def __init__(self, kind, value, maxvalue, name=None):
+        # unlink_now is only used on win32 or when we are using fork.
+        unlink_now = False
+        if name is None:
+            # Try to find an unused name for the SemLock instance.
+            for _ in range(100):
+                try:
+                    self._semlock = _SemLock(
+                        kind, value, maxvalue, SemLock._make_name(), unlink_now
+                    )
+                except FileExistsError:  # pragma: no cover
+                    pass
+                else:
+                    break
+            else:  # pragma: no cover
+                raise FileExistsError("cannot find name for semaphore")
+        else:
+            self._semlock = _SemLock(kind, value, maxvalue, name, unlink_now)
+        self.name = name
+        util.debug(
+            f"created semlock with handle {self._semlock.handle} and name "
+            f'"{self.name}"'
+        )
+
+        self._make_methods()
+
+        def _after_fork(obj):
+            obj._semlock._after_fork()
+
+        util.register_after_fork(self, _after_fork)
+
+        # When the object is garbage collected or the
+        # process shuts down we unlink the semaphore name
+        resource_tracker.register(self._semlock.name, "semlock")
+        util.Finalize(
+            self, SemLock._cleanup, (self._semlock.name,), exitpriority=0
+        )
+
+    @staticmethod
+    def _cleanup(name):
+        try:
+            sem_unlink(name)
+        except FileNotFoundError:
+            # Already unlinked, possibly by user code: ignore and make sure to
+            # unregister the semaphore from the resource tracker.
+            pass
+        finally:
+            resource_tracker.unregister(name, "semlock")
+
+    def _make_methods(self):
+        self.acquire = self._semlock.acquire
+        self.release = self._semlock.release
+
+    def __enter__(self):
+        return self._semlock.acquire()
+
+    def __exit__(self, *args):
+        return self._semlock.release()
+
+    def __getstate__(self):
+        assert_spawning(self)
+        sl = self._semlock
+        h = sl.handle
+        return (h, sl.kind, sl.maxvalue, sl.name)
+
+    def __setstate__(self, state):
+        self._semlock = _SemLock._rebuild(*state)
+        util.debug(
+            f'recreated blocker with handle {state[0]!r} and name "{state[3]}"'
+        )
+        self._make_methods()
+
+    @staticmethod
+    def _make_name():
+        # OSX does not support long names for semaphores
+        return f"/loky-{os.getpid()}-{next(SemLock._rand)}"
+
+
+#
+# Semaphore
+#
+
+
+class Semaphore(SemLock):
+    def __init__(self, value=1):
+        SemLock.__init__(self, SEMAPHORE, value, SEM_VALUE_MAX)
+
+    def get_value(self):
+        if sys.platform == "darwin":
+            raise NotImplementedError("OSX does not implement sem_getvalue")
+        return self._semlock._get_value()
+
+    def __repr__(self):
+        try:
+            value = self._semlock._get_value()
+        except Exception:
+            value = "unknown"
+        return f"<{self.__class__.__name__}(value={value})>"
+
+
+#
+# Bounded semaphore
+#
+
+
+class BoundedSemaphore(Semaphore):
+    def __init__(self, value=1):
+        SemLock.__init__(self, SEMAPHORE, value, value)
+
+    def __repr__(self):
+        try:
+            value = self._semlock._get_value()
+        except Exception:
+            value = "unknown"
+        return (
+            f"<{self.__class__.__name__}(value={value}, "
+            f"maxvalue={self._semlock.maxvalue})>"
+        )
+
+
+#
+# Non-recursive lock
+#
+
+
+class Lock(SemLock):
+    def __init__(self):
+        super().__init__(SEMAPHORE, 1, 1)
+
+    def __repr__(self):
+        try:
+            if self._semlock._is_mine():
+                name = process.current_process().name
+                if threading.current_thread().name != "MainThread":
+                    name = f"{name}|{threading.current_thread().name}"
+            elif self._semlock._get_value() == 1:
+                name = "None"
+            elif self._semlock._count() > 0:
+                name = "SomeOtherThread"
+            else:
+                name = "SomeOtherProcess"
+        except Exception:
+            name = "unknown"
+        return f"<{self.__class__.__name__}(owner={name})>"
+
+
+#
+# Recursive lock
+#
+
+
+class RLock(SemLock):
+    def __init__(self):
+        super().__init__(RECURSIVE_MUTEX, 1, 1)
+
+    def __repr__(self):
+        try:
+            if self._semlock._is_mine():
+                name = process.current_process().name
+                if threading.current_thread().name != "MainThread":
+                    name = f"{name}|{threading.current_thread().name}"
+                count = self._semlock._count()
+            elif self._semlock._get_value() == 1:
+                name, count = "None", 0
+            elif self._semlock._count() > 0:
+                name, count = "SomeOtherThread", "nonzero"
+            else:
+                name, count = "SomeOtherProcess", "nonzero"
+        except Exception:
+            name, count = "unknown", "unknown"
+        return f"<{self.__class__.__name__}({name}, {count})>"
+
+
+#
+# Condition variable
+#
+
+
+class Condition:
+    def __init__(self, lock=None):
+        self._lock = lock or RLock()
+        self._sleeping_count = Semaphore(0)
+        self._woken_count = Semaphore(0)
+        self._wait_semaphore = Semaphore(0)
+        self._make_methods()
+
+    def __getstate__(self):
+        assert_spawning(self)
+        return (
+            self._lock,
+            self._sleeping_count,
+            self._woken_count,
+            self._wait_semaphore,
+        )
+
+    def __setstate__(self, state):
+        (
+            self._lock,
+            self._sleeping_count,
+            self._woken_count,
+            self._wait_semaphore,
+        ) = state
+        self._make_methods()
+
+    def __enter__(self):
+        return self._lock.__enter__()
+
+    def __exit__(self, *args):
+        return self._lock.__exit__(*args)
+
+    def _make_methods(self):
+        self.acquire = self._lock.acquire
+        self.release = self._lock.release
+
+    def __repr__(self):
+        try:
+            num_waiters = (
+                self._sleeping_count._semlock._get_value()
+                - self._woken_count._semlock._get_value()
+            )
+        except Exception:
+            num_waiters = "unknown"
+        return f"<{self.__class__.__name__}({self._lock}, {num_waiters})>"
+
+    def wait(self, timeout=None):
+        assert (
+            self._lock._semlock._is_mine()
+        ), "must acquire() condition before using wait()"
+
+        # indicate that this thread is going to sleep
+        self._sleeping_count.release()
+
+        # release lock
+        count = self._lock._semlock._count()
+        for _ in range(count):
+            self._lock.release()
+
+        try:
+            # wait for notification or timeout
+            return self._wait_semaphore.acquire(True, timeout)
+        finally:
+            # indicate that this thread has woken
+            self._woken_count.release()
+
+            # reacquire lock
+            for _ in range(count):
+                self._lock.acquire()
+
+    def notify(self):
+        assert self._lock._semlock._is_mine(), "lock is not owned"
+        assert not self._wait_semaphore.acquire(False)
+
+        # to take account of timeouts since last notify() we subtract
+        # woken_count from sleeping_count and rezero woken_count
+        while self._woken_count.acquire(False):
+            res = self._sleeping_count.acquire(False)
+            assert res
+
+        if self._sleeping_count.acquire(False):  # try grabbing a sleeper
+            self._wait_semaphore.release()  # wake up one sleeper
+            self._woken_count.acquire()  # wait for the sleeper to wake
+
+            # rezero _wait_semaphore in case a timeout just happened
+            self._wait_semaphore.acquire(False)
+
+    def notify_all(self):
+        assert self._lock._semlock._is_mine(), "lock is not owned"
+        assert not self._wait_semaphore.acquire(False)
+
+        # to take account of timeouts since last notify*() we subtract
+        # woken_count from sleeping_count and rezero woken_count
+        while self._woken_count.acquire(False):
+            res = self._sleeping_count.acquire(False)
+            assert res
+
+        sleepers = 0
+        while self._sleeping_count.acquire(False):
+            self._wait_semaphore.release()  # wake up one sleeper
+            sleepers += 1
+
+        if sleepers:
+            for _ in range(sleepers):
+                self._woken_count.acquire()  # wait for a sleeper to wake
+
+            # rezero wait_semaphore in case some timeouts just happened
+            while self._wait_semaphore.acquire(False):
+                pass
+
+    def wait_for(self, predicate, timeout=None):
+        result = predicate()
+        if result:
+            return result
+        if timeout is not None:
+            endtime = _time() + timeout
+        else:
+            endtime = None
+            waittime = None
+        while not result:
+            if endtime is not None:
+                waittime = endtime - _time()
+                if waittime <= 0:
+                    break
+            self.wait(waittime)
+            result = predicate()
+        return result
+
+
+#
+# Event
+#
+
+
+class Event:
+    def __init__(self):
+        self._cond = Condition(Lock())
+        self._flag = Semaphore(0)
+
+    def is_set(self):
+        with self._cond:
+            if self._flag.acquire(False):
+                self._flag.release()
+                return True
+            return False
+
+    def set(self):
+        with self._cond:
+            self._flag.acquire(False)
+            self._flag.release()
+            self._cond.notify_all()
+
+    def clear(self):
+        with self._cond:
+            self._flag.acquire(False)
+
+    def wait(self, timeout=None):
+        with self._cond:
+            if self._flag.acquire(False):
+                self._flag.release()
+            else:
+                self._cond.wait(timeout)
+
+            if self._flag.acquire(False):
+                self._flag.release()
+                return True
+            return False

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/backend/utils.py

@@ -0,0 +1,181 @@
+import os
+import sys
+import time
+import errno
+import signal
+import warnings
+import subprocess
+import traceback
+
+try:
+    import psutil
+except ImportError:
+    psutil = None
+
+
+def kill_process_tree(process, use_psutil=True):
+    """Terminate process and its descendants with SIGKILL"""
+    if use_psutil and psutil is not None:
+        _kill_process_tree_with_psutil(process)
+    else:
+        _kill_process_tree_without_psutil(process)
+
+
+def recursive_terminate(process, use_psutil=True):
+    warnings.warn(
+        "recursive_terminate is deprecated in loky 3.2, use kill_process_tree"
+        "instead",
+        DeprecationWarning,
+    )
+    kill_process_tree(process, use_psutil=use_psutil)
+
+
+def _kill_process_tree_with_psutil(process):
+    try:
+        descendants = psutil.Process(process.pid).children(recursive=True)
+    except psutil.NoSuchProcess:
+        return
+
+    # Kill the descendants in reverse order to avoid killing the parents before
+    # the descendant in cases where there are more processes nested.
+    for descendant in descendants[::-1]:
+        try:
+            descendant.kill()
+        except psutil.NoSuchProcess:
+            pass
+
+    try:
+        psutil.Process(process.pid).kill()
+    except psutil.NoSuchProcess:
+        pass
+    process.join()
+
+
+def _kill_process_tree_without_psutil(process):
+    """Terminate a process and its descendants."""
+    try:
+        if sys.platform == "win32":
+            _windows_taskkill_process_tree(process.pid)
+        else:
+            _posix_recursive_kill(process.pid)
+    except Exception:  # pragma: no cover
+        details = traceback.format_exc()
+        warnings.warn(
+            "Failed to kill subprocesses on this platform. Please install"
+            "psutil: https://github.com/giampaolo/psutil\n"
+            f"Details:\n{details}"
+        )
+        # In case we cannot introspect or kill the descendants, we fall back to
+        # only killing the main process.
+        #
+        # Note: on Windows, process.kill() is an alias for process.terminate()
+        # which in turns calls the Win32 API function TerminateProcess().
+        process.kill()
+    process.join()
+
+
+def _windows_taskkill_process_tree(pid):
+    # On windows, the taskkill function with option `/T` terminate a given
+    # process pid and its children.
+    try:
+        subprocess.check_output(
+            ["taskkill", "/F", "/T", "/PID", str(pid)], stderr=None
+        )
+    except subprocess.CalledProcessError as e:
+        # In Windows, taskkill returns 128, 255 for no process found.
+        if e.returncode not in [128, 255]:
+            # Let's raise to let the caller log the error details in a
+            # warning and only kill the root process.
+            raise  # pragma: no cover
+
+
+def _kill(pid):
+    # Not all systems (e.g. Windows) have a SIGKILL, but the C specification
+    # mandates a SIGTERM signal. While Windows is handled specifically above,
+    # let's try to be safe for other hypothetic platforms that only have
+    # SIGTERM without SIGKILL.
+    kill_signal = getattr(signal, "SIGKILL", signal.SIGTERM)
+    try:
+        os.kill(pid, kill_signal)
+    except OSError as e:
+        # if OSError is raised with [Errno 3] no such process, the process
+        # is already terminated, else, raise the error and let the top
+        # level function raise a warning and retry to kill the process.
+        if e.errno != errno.ESRCH:
+            raise  # pragma: no cover
+
+
+def _posix_recursive_kill(pid):
+    """Recursively kill the descendants of a process before killing it."""
+    try:
+        children_pids = subprocess.check_output(
+            ["pgrep", "-P", str(pid)], stderr=None, text=True
+        )
+    except subprocess.CalledProcessError as e:
+        # `ps` returns 1 when no child process has been found
+        if e.returncode == 1:
+            children_pids = ""
+        else:
+            raise  # pragma: no cover
+
+    # Decode the result, split the cpid and remove the trailing line
+    for cpid in children_pids.splitlines():
+        cpid = int(cpid)
+        _posix_recursive_kill(cpid)
+
+    _kill(pid)
+
+
+def get_exitcodes_terminated_worker(processes):
+    """Return a formatted string with the exitcodes of terminated workers.
+
+    If necessary, wait (up to .25s) for the system to correctly set the
+    exitcode of one terminated worker.
+    """
+    patience = 5
+
+    # Catch the exitcode of the terminated workers. There should at least be
+    # one. If not, wait a bit for the system to correctly set the exitcode of
+    # the terminated worker.
+    exitcodes = [
+        p.exitcode for p in list(processes.values()) if p.exitcode is not None
+    ]
+    while not exitcodes and patience > 0:
+        patience -= 1
+        exitcodes = [
+            p.exitcode
+            for p in list(processes.values())
+            if p.exitcode is not None
+        ]
+        time.sleep(0.05)
+
+    return _format_exitcodes(exitcodes)
+
+
+def _format_exitcodes(exitcodes):
+    """Format a list of exit code with names of the signals if possible"""
+    str_exitcodes = [
+        f"{_get_exitcode_name(e)}({e})" for e in exitcodes if e is not None
+    ]
+    return "{" + ", ".join(str_exitcodes) + "}"
+
+
+def _get_exitcode_name(exitcode):
+    if sys.platform == "win32":
+        # The exitcode are unreliable  on windows (see bpo-31863).
+        # For this case, return UNKNOWN
+        return "UNKNOWN"
+
+    if exitcode < 0:
+        try:
+            import signal
+
+            return signal.Signals(-exitcode).name
+        except ValueError:
+            return "UNKNOWN"
+    elif exitcode != 255:
+        # The exitcode are unreliable on forkserver were 255 is always returned
+        # (see bpo-30589). For this case, return UNKNOWN
+        return "EXIT"
+
+    return "UNKNOWN"

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/cloudpickle_wrapper.py

@@ -0,0 +1,102 @@
+import inspect
+from functools import partial
+from joblib.externals.cloudpickle import dumps, loads
+
+
+WRAP_CACHE = {}
+
+
+class CloudpickledObjectWrapper:
+    def __init__(self, obj, keep_wrapper=False):
+        self._obj = obj
+        self._keep_wrapper = keep_wrapper
+
+    def __reduce__(self):
+        _pickled_object = dumps(self._obj)
+        if not self._keep_wrapper:
+            return loads, (_pickled_object,)
+
+        return _reconstruct_wrapper, (_pickled_object, self._keep_wrapper)
+
+    def __getattr__(self, attr):
+        # Ensure that the wrapped object can be used seemlessly as the
+        # previous object.
+        if attr not in ["_obj", "_keep_wrapper"]:
+            return getattr(self._obj, attr)
+        return getattr(self, attr)
+
+
+# Make sure the wrapped object conserves the callable property
+class CallableObjectWrapper(CloudpickledObjectWrapper):
+    def __call__(self, *args, **kwargs):
+        return self._obj(*args, **kwargs)
+
+
+def _wrap_non_picklable_objects(obj, keep_wrapper):
+    if callable(obj):
+        return CallableObjectWrapper(obj, keep_wrapper=keep_wrapper)
+    return CloudpickledObjectWrapper(obj, keep_wrapper=keep_wrapper)
+
+
+def _reconstruct_wrapper(_pickled_object, keep_wrapper):
+    obj = loads(_pickled_object)
+    return _wrap_non_picklable_objects(obj, keep_wrapper)
+
+
+def _wrap_objects_when_needed(obj):
+    # Function to introspect an object and decide if it should be wrapped or
+    # not.
+    need_wrap = "__main__" in getattr(obj, "__module__", "")
+    if isinstance(obj, partial):
+        return partial(
+            _wrap_objects_when_needed(obj.func),
+            *[_wrap_objects_when_needed(a) for a in obj.args],
+            **{
+                k: _wrap_objects_when_needed(v)
+                for k, v in obj.keywords.items()
+            },
+        )
+    if callable(obj):
+        # Need wrap if the object is a function defined in a local scope of
+        # another function.
+        func_code = getattr(obj, "__code__", "")
+        need_wrap |= getattr(func_code, "co_flags", 0) & inspect.CO_NESTED
+
+        # Need wrap if the obj is a lambda expression
+        func_name = getattr(obj, "__name__", "")
+        need_wrap |= "<lambda>" in func_name
+
+    if not need_wrap:
+        return obj
+
+    wrapped_obj = WRAP_CACHE.get(obj)
+    if wrapped_obj is None:
+        wrapped_obj = _wrap_non_picklable_objects(obj, keep_wrapper=False)
+        WRAP_CACHE[obj] = wrapped_obj
+    return wrapped_obj
+
+
+def wrap_non_picklable_objects(obj, keep_wrapper=True):
+    """Wrapper for non-picklable object to use cloudpickle to serialize them.
+
+    Note that this wrapper tends to slow down the serialization process as it
+    is done with cloudpickle which is typically slower compared to pickle. The
+    proper way to solve serialization issues is to avoid defining functions and
+    objects in the main scripts and to implement __reduce__ functions for
+    complex classes.
+    """
+    # If obj is a  class, create a CloudpickledClassWrapper which instantiates
+    # the object internally and wrap it directly in a CloudpickledObjectWrapper
+    if inspect.isclass(obj):
+
+        class CloudpickledClassWrapper(CloudpickledObjectWrapper):
+            def __init__(self, *args, **kwargs):
+                self._obj = obj(*args, **kwargs)
+                self._keep_wrapper = keep_wrapper
+
+        CloudpickledClassWrapper.__name__ = obj.__name__
+        return CloudpickledClassWrapper
+
+    # If obj is an instance of a class, just wrap it in a regular
+    # CloudpickledObjectWrapper
+    return _wrap_non_picklable_objects(obj, keep_wrapper=keep_wrapper)

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/initializers.py

@@ -0,0 +1,80 @@
+import warnings
+
+
+def _viztracer_init(init_kwargs):
+    """Initialize viztracer's profiler in worker processes"""
+    from viztracer import VizTracer
+
+    tracer = VizTracer(**init_kwargs)
+    tracer.register_exit()
+    tracer.start()
+
+
+def _make_viztracer_initializer_and_initargs():
+    try:
+        import viztracer
+
+        tracer = viztracer.get_tracer()
+        if tracer is not None and getattr(tracer, "enable", False):
+            # Profiler is active: introspect its configuration to
+            # initialize the workers with the same configuration.
+            return _viztracer_init, (tracer.init_kwargs,)
+    except ImportError:
+        # viztracer is not installed: nothing to do
+        pass
+    except Exception as e:
+        # In case viztracer's API evolve, we do not want to crash loky but
+        # we want to know about it to be able to update loky.
+        warnings.warn(f"Unable to introspect viztracer state: {e}")
+    return None, ()
+
+
+class _ChainedInitializer:
+    """Compound worker initializer
+
+    This is meant to be used in conjunction with _chain_initializers to
+    produce  the necessary chained_args list to be passed to __call__.
+    """
+
+    def __init__(self, initializers):
+        self._initializers = initializers
+
+    def __call__(self, *chained_args):
+        for initializer, args in zip(self._initializers, chained_args):
+            initializer(*args)
+
+
+def _chain_initializers(initializer_and_args):
+    """Convenience helper to combine a sequence of initializers.
+
+    If some initializers are None, they are filtered out.
+    """
+    filtered_initializers = []
+    filtered_initargs = []
+    for initializer, initargs in initializer_and_args:
+        if initializer is not None:
+            filtered_initializers.append(initializer)
+            filtered_initargs.append(initargs)
+
+    if not filtered_initializers:
+        return None, ()
+    elif len(filtered_initializers) == 1:
+        return filtered_initializers[0], filtered_initargs[0]
+    else:
+        return _ChainedInitializer(filtered_initializers), filtered_initargs
+
+
+def _prepare_initializer(initializer, initargs):
+    if initializer is not None and not callable(initializer):
+        raise TypeError(
+            f"initializer must be a callable, got: {initializer!r}"
+        )
+
+    # Introspect runtime to determine if we need to propagate the viztracer
+    # profiler information to the workers:
+    return _chain_initializers(
+        [
+            (initializer, initargs),
+            _make_viztracer_initializer_and_initargs(),
+        ]
+    )

Backend/venv/lib/python3.12/site-packages/joblib/externals/loky/reusable_executor.py

@@ -0,0 +1,294 @@
+###############################################################################
+# Reusable ProcessPoolExecutor
+#
+# author: Thomas Moreau and Olivier Grisel
+#
+import time
+import warnings
+import threading
+import multiprocessing as mp
+
+from .process_executor import ProcessPoolExecutor, EXTRA_QUEUED_CALLS
+from .backend.context import cpu_count
+from .backend import get_context
+
+__all__ = ["get_reusable_executor"]
+
+# Singleton executor and id management
+_executor_lock = threading.RLock()
+_next_executor_id = 0
+_executor = None
+_executor_kwargs = None
+
+
+def _get_next_executor_id():
+    """Ensure that each successive executor instance has a unique, monotonic id.
+
+    The purpose of this monotonic id is to help debug and test automated
+    instance creation.
+    """
+    global _next_executor_id
+    with _executor_lock:
+        executor_id = _next_executor_id
+        _next_executor_id += 1
+        return executor_id
+
+
+def get_reusable_executor(
+    max_workers=None,
+    context=None,
+    timeout=10,
+    kill_workers=False,
+    reuse="auto",
+    job_reducers=None,
+    result_reducers=None,
+    initializer=None,
+    initargs=(),
+    env=None,
+):
+    """Return the current ReusableExectutor instance.
+
+    Start a new instance if it has not been started already or if the previous
+    instance was left in a broken state.
+
+    If the previous instance does not have the requested number of workers, the
+    executor is dynamically resized to adjust the number of workers prior to
+    returning.
+
+    Reusing a singleton instance spares the overhead of starting new worker
+    processes and importing common python packages each time.
+
+    ``max_workers`` controls the maximum number of tasks that can be running in
+    parallel in worker processes. By default this is set to the number of
+    CPUs on the host.
+
+    Setting ``timeout`` (in seconds) makes idle workers automatically shutdown
+    so as to release system resources. New workers are respawn upon submission
+    of new tasks so that ``max_workers`` are available to accept the newly
+    submitted tasks. Setting ``timeout`` to around 100 times the time required
+    to spawn new processes and import packages in them (on the order of 100ms)
+    ensures that the overhead of spawning workers is negligible.
+
+    Setting ``kill_workers=True`` makes it possible to forcibly interrupt
+    previously spawned jobs to get a new instance of the reusable executor
+    with new constructor argument values.
+
+    The ``job_reducers`` and ``result_reducers`` are used to customize the
+    pickling of tasks and results send to the executor.
+
+    When provided, the ``initializer`` is run first in newly spawned
+    processes with argument ``initargs``.
+
+    The environment variable in the child process are a copy of the values in
+    the main process. One can provide a dict ``{ENV: VAL}`` where ``ENV`` and
+    ``VAL`` are string literals to overwrite the environment variable ``ENV``
+    in the child processes to value ``VAL``. The environment variables are set
+    in the children before any module is loaded. This only works with the
+    ``loky`` context.
+    """
+    _executor, _ = _ReusablePoolExecutor.get_reusable_executor(
+        max_workers=max_workers,
+        context=context,
+        timeout=timeout,
+        kill_workers=kill_workers,
+        reuse=reuse,
+        job_reducers=job_reducers,
+        result_reducers=result_reducers,
+        initializer=initializer,
+        initargs=initargs,
+        env=env,
+    )
+    return _executor
+
+
+class _ReusablePoolExecutor(ProcessPoolExecutor):
+    def __init__(
+        self,
+        submit_resize_lock,
+        max_workers=None,
+        context=None,
+        timeout=None,
+        executor_id=0,
+        job_reducers=None,
+        result_reducers=None,
+        initializer=None,
+        initargs=(),
+        env=None,
+    ):
+        super().__init__(
+            max_workers=max_workers,
+            context=context,
+            timeout=timeout,
+            job_reducers=job_reducers,
+            result_reducers=result_reducers,
+            initializer=initializer,
+            initargs=initargs,
+            env=env,
+        )
+        self.executor_id = executor_id
+        self._submit_resize_lock = submit_resize_lock
+
+    @classmethod
+    def get_reusable_executor(
+        cls,
+        max_workers=None,
+        context=None,
+        timeout=10,
+        kill_workers=False,
+        reuse="auto",
+        job_reducers=None,
+        result_reducers=None,
+        initializer=None,
+        initargs=(),
+        env=None,
+    ):
+        with _executor_lock:
+            global _executor, _executor_kwargs
+            executor = _executor
+
+            if max_workers is None:
+                if reuse is True and executor is not None:
+                    max_workers = executor._max_workers
+                else:
+                    max_workers = cpu_count()
+            elif max_workers <= 0:
+                raise ValueError(
+                    f"max_workers must be greater than 0, got {max_workers}."
+                )
+
+            if isinstance(context, str):
+                context = get_context(context)
+            if context is not None and context.get_start_method() == "fork":
+                raise ValueError(
+                    "Cannot use reusable executor with the 'fork' context"
+                )
+
+            kwargs = dict(
+                context=context,
+                timeout=timeout,
+                job_reducers=job_reducers,
+                result_reducers=result_reducers,
+                initializer=initializer,
+                initargs=initargs,
+                env=env,
+            )
+            if executor is None:
+                is_reused = False
+                mp.util.debug(
+                    f"Create a executor with max_workers={max_workers}."
+                )
+                executor_id = _get_next_executor_id()
+                _executor_kwargs = kwargs
+                _executor = executor = cls(
+                    _executor_lock,
+                    max_workers=max_workers,
+                    executor_id=executor_id,
+                    **kwargs,
+                )
+            else:
+                if reuse == "auto":
+                    reuse = kwargs == _executor_kwargs
+                if (
+                    executor._flags.broken
+                    or executor._flags.shutdown
+                    or not reuse
+                    or executor.queue_size < max_workers
+                ):
+                    if executor._flags.broken:
+                        reason = "broken"
+                    elif executor._flags.shutdown:
+                        reason = "shutdown"
+                    elif executor.queue_size < max_workers:
+                        # Do not reuse the executor if the queue size is too
+                        # small as this would lead to limited parallelism.
+                        reason = "queue size is too small"
+                    else:
+                        reason = "arguments have changed"
+                    mp.util.debug(
+                        "Creating a new executor with max_workers="
+                        f"{max_workers} as the previous instance cannot be "
+                        f"reused ({reason})."
+                    )
+                    executor.shutdown(wait=True, kill_workers=kill_workers)
+                    _executor = executor = _executor_kwargs = None
+                    # Recursive call to build a new instance
+                    return cls.get_reusable_executor(
+                        max_workers=max_workers, **kwargs
+                    )
+                else:
+                    mp.util.debug(
+                        "Reusing existing executor with "
+                        f"max_workers={executor._max_workers}."
+                    )
+                    is_reused = True
+                    executor._resize(max_workers)
+
+        return executor, is_reused
+
+    def submit(self, fn, *args, **kwargs):
+        with self._submit_resize_lock:
+            return super().submit(fn, *args, **kwargs)
+
+    def _resize(self, max_workers):
+        with self._submit_resize_lock:
+            if max_workers is None:
+                raise ValueError("Trying to resize with max_workers=None")
+            elif max_workers == self._max_workers:
+                return
+
+            if self._executor_manager_thread is None:
+                # If the executor_manager_thread has not been started
+                # then no processes have been spawned and we can just
+                # update _max_workers and return
+                self._max_workers = max_workers
+                return
+
+            self._wait_job_completion()
+
+            # Some process might have returned due to timeout so check how many
+            # children are still alive. Use the _process_management_lock to
+            # ensure that no process are spawned or timeout during the resize.
+            with self._processes_management_lock:
+                processes = list(self._processes.values())
+                nb_children_alive = sum(p.is_alive() for p in processes)
+                self._max_workers = max_workers
+                for _ in range(max_workers, nb_children_alive):
+                    self._call_queue.put(None)
+            while (
+                len(self._processes) > max_workers and not self._flags.broken
+            ):
+                time.sleep(1e-3)
+
+            self._adjust_process_count()
+            processes = list(self._processes.values())
+            while not all(p.is_alive() for p in processes):
+                time.sleep(1e-3)
+
+    def _wait_job_completion(self):
+        """Wait for the cache to be empty before resizing the pool."""
+        # Issue a warning to the user about the bad effect of this usage.
+        if self._pending_work_items:
+            warnings.warn(
+                "Trying to resize an executor with running jobs: "
+                "waiting for jobs completion before resizing.",
+                UserWarning,
+            )
+            mp.util.debug(
+                f"Executor {self.executor_id} waiting for jobs completion "
+                "before resizing"
+            )
+        # Wait for the completion of the jobs
+        while self._pending_work_items:
+            time.sleep(1e-3)
+
+    def _setup_queues(self, job_reducers, result_reducers):
+        # As this executor can be resized, use a large queue size to avoid
+        # underestimating capacity and introducing overhead
+        # Also handle the case where the user set max_workers to a value larger
+        # than cpu_count(), to avoid limiting the number of parallel jobs.
+
+        min_queue_size = max(cpu_count(), self._max_workers)
+        self.queue_size = 2 * min_queue_size + EXTRA_QUEUED_CALLS
+        super()._setup_queues(
+            job_reducers, result_reducers, queue_size=self.queue_size
+        )