Vendor loky 3.1.0 (#1269)

CHANGES.rst

@@ -12,6 +12,10 @@ Development version
   the temporary memmap folder contents concurrently.
   https://github.com/joblib/joblib/pull/1263
 
+- Vendor loky 3.1.0 with several fixes to more robustly forcibly terminate
+  worker processes in case of a crash.
+  https://github.com/joblib/joblib/pull/1269
+
 Release 1.1.0
 --------------
 

joblib/externals/loky/__init__.py

@@ -3,11 +3,18 @@
 :class:`ProcessPoolExecutor` and a function :func:`get_reusable_executor` which
 hide the pool management under the hood.
 """
-from ._base import Executor, Future
-from ._base import wait, as_completed
-from ._base import TimeoutError, CancelledError
-from ._base import ALL_COMPLETED, FIRST_COMPLETED, FIRST_EXCEPTION
+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
@@ -22,4 +29,4 @@
            "wrap_non_picklable_objects", "set_loky_pickler"]
 
 
-__version__ = '3.0.0'
+__version__ = '3.1.0'