Blob Blame History Raw
From 59683c433fd4c19f4921e4b44b8a70174e82fc4b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Tue, 10 Sep 2019 08:32:24 +0200
Subject: [PATCH 18/18] Unbundle cloudpickle

---
 joblib/externals/cloudpickle/__init__.py     |   11 -
 joblib/externals/cloudpickle/cloudpickle.py  | 1380 ------------------
 joblib/externals/loky/backend/reduction.py   |    4 +-
 joblib/externals/loky/cloudpickle_wrapper.py |    2 +-
 joblib/parallel.py                           |    2 +-
 setup.py                                     |    2 +-
 6 files changed, 5 insertions(+), 1396 deletions(-)
 delete mode 100644 joblib/externals/cloudpickle/__init__.py
 delete mode 100644 joblib/externals/cloudpickle/cloudpickle.py

diff --git a/joblib/externals/cloudpickle/__init__.py b/joblib/externals/cloudpickle/__init__.py
deleted file mode 100644
index 9806b5c7b2..0000000000
--- a/joblib/externals/cloudpickle/__init__.py
+++ /dev/null
@@ -1,11 +0,0 @@
-from __future__ import absolute_import
-
-import sys
-import pickle
-
-
-from .cloudpickle import *
-if sys.version_info[:2] >= (3, 8):
-    from .cloudpickle_fast import CloudPickler, dumps, dump
-
-__version__ = '1.2.1'
diff --git a/joblib/externals/cloudpickle/cloudpickle.py b/joblib/externals/cloudpickle/cloudpickle.py
deleted file mode 100644
index cc74c642ec..0000000000
--- a/joblib/externals/cloudpickle/cloudpickle.py
+++ /dev/null
@@ -1,1380 +0,0 @@
-"""
-This class is defined to override standard pickle functionality
-
-The goals of it follow:
--Serialize lambdas and nested functions to compiled byte code
--Deal with main module correctly
--Deal with other non-serializable objects
-
-It does not include an unpickler, as standard python unpickling suffices.
-
-This module was extracted from the `cloud` package, developed by `PiCloud, Inc.
-<https://web.archive.org/web/20140626004012/http://www.picloud.com/>`_.
-
-Copyright (c) 2012, Regents of the University of California.
-Copyright (c) 2009 `PiCloud, Inc. <https://web.archive.org/web/20140626004012/http://www.picloud.com/>`_.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-    * Redistributions in binary form must reproduce the above copyright
-      notice, this list of conditions and the following disclaimer in the
-      documentation and/or other materials provided with the distribution.
-    * Neither the name of the University of California, Berkeley nor the
-      names of its contributors may be used to endorse or promote
-      products derived from this software without specific prior written
-      permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-"""
-from __future__ import print_function
-
-import dis
-from functools import partial
-import io
-import itertools
-import logging
-import opcode
-import operator
-import pickle
-import platform
-import struct
-import sys
-import traceback
-import types
-import weakref
-import uuid
-import threading
-
-
-try:
-    from enum import Enum
-except ImportError:
-    Enum = None
-
-# cloudpickle is meant for inter process communication: we expect all
-# communicating processes to run the same Python version hence we favor
-# communication speed over compatibility:
-DEFAULT_PROTOCOL = pickle.HIGHEST_PROTOCOL
-
-# Track the provenance of reconstructed dynamic classes to make it possible to
-# recontruct instances from the matching singleton class definition when
-# appropriate and preserve the usual "isinstance" semantics of Python objects.
-_DYNAMIC_CLASS_TRACKER_BY_CLASS = weakref.WeakKeyDictionary()
-_DYNAMIC_CLASS_TRACKER_BY_ID = weakref.WeakValueDictionary()
-_DYNAMIC_CLASS_TRACKER_LOCK = threading.Lock()
-
-PYPY = platform.python_implementation() == "PyPy"
-
-builtin_code_type = None
-if PYPY:
-    # builtin-code objects only exist in pypy
-    builtin_code_type = type(float.__new__.__code__)
-
-if sys.version_info[0] < 3:  # pragma: no branch
-    from pickle import Pickler
-    try:
-        from cStringIO import StringIO
-    except ImportError:
-        from StringIO import StringIO
-    string_types = (basestring,)  # noqa
-    PY3 = False
-    PY2 = True
-else:
-    types.ClassType = type
-    from pickle import _Pickler as Pickler
-    from io import BytesIO as StringIO
-    string_types = (str,)
-    PY3 = True
-    PY2 = False
-    from importlib._bootstrap import _find_spec
-
-_extract_code_globals_cache = weakref.WeakKeyDictionary()
-
-
-def _ensure_tracking(class_def):
-    with _DYNAMIC_CLASS_TRACKER_LOCK:
-        class_tracker_id = _DYNAMIC_CLASS_TRACKER_BY_CLASS.get(class_def)
-        if class_tracker_id is None:
-            class_tracker_id = uuid.uuid4().hex
-            _DYNAMIC_CLASS_TRACKER_BY_CLASS[class_def] = class_tracker_id
-            _DYNAMIC_CLASS_TRACKER_BY_ID[class_tracker_id] = class_def
-    return class_tracker_id
-
-
-def _lookup_class_or_track(class_tracker_id, class_def):
-    if class_tracker_id is not None:
-        with _DYNAMIC_CLASS_TRACKER_LOCK:
-            class_def = _DYNAMIC_CLASS_TRACKER_BY_ID.setdefault(
-                class_tracker_id, class_def)
-            _DYNAMIC_CLASS_TRACKER_BY_CLASS[class_def] = class_tracker_id
-    return class_def
-
-if sys.version_info[:2] >= (3, 5):
-    from pickle import _getattribute
-elif sys.version_info[:2] >= (3, 4):
-    from pickle import _getattribute as _py34_getattribute
-    #  pickle._getattribute does not return the parent under Python 3.4
-    def _getattribute(obj, name):
-        return _py34_getattribute(obj, name), None
-else:
-    # pickle._getattribute is a python3 addition and enchancement of getattr,
-    # that can handle dotted attribute names. In cloudpickle for python2,
-    # handling dotted names is not needed, so we simply define _getattribute as
-    # a wrapper around getattr.
-    def _getattribute(obj, name):
-        return getattr(obj, name, None), None
-
-
-def _whichmodule(obj, name):
-    """Find the module an object belongs to.
-
-    This function differs from ``pickle.whichmodule`` in two ways:
-    - it does not mangle the cases where obj's module is __main__ and obj was
-      not found in any module.
-    - Errors arising during module introspection are ignored, as those errors
-      are considered unwanted side effects.
-    """
-    module_name = getattr(obj, '__module__', None)
-    if module_name is not None:
-        return module_name
-    # Protect the iteration by using a list copy of sys.modules against dynamic
-    # modules that trigger imports of other modules upon calls to getattr.
-    for module_name, module in list(sys.modules.items()):
-        if module_name == '__main__' or module is None:
-            continue
-        try:
-            if _getattribute(module, name)[0] is obj:
-                return module_name
-        except Exception:
-            pass
-    return None
-
-
-def _is_global(obj, name=None):
-    """Determine if obj can be pickled as attribute of a file-backed module"""
-    if name is None:
-        name = getattr(obj, '__qualname__', None)
-    if name is None:
-        name = getattr(obj, '__name__', None)
-
-    module_name = _whichmodule(obj, name)
-
-    if module_name is None:
-        # In this case, obj.__module__ is None AND obj was not found in any
-        # imported module. obj is thus treated as dynamic.
-        return False
-
-    if module_name == "__main__":
-        return False
-
-    module = sys.modules.get(module_name, None)
-    if module is None:
-        # The main reason why obj's module would not be imported is that this
-        # module has been dynamically created, using for example
-        # types.ModuleType. The other possibility is that module was removed
-        # from sys.modules after obj was created/imported. But this case is not
-        # supported, as the standard pickle does not support it either.
-        return False
-
-    # module has been added to sys.modules, but it can still be dynamic.
-    if _is_dynamic(module):
-        return False
-
-    try:
-        obj2, parent = _getattribute(module, name)
-    except AttributeError:
-        # obj was not found inside the module it points to
-        return False
-    return obj2 is obj
-
-
-def _extract_code_globals(co):
-    """
-    Find all globals names read or written to by codeblock co
-    """
-    out_names = _extract_code_globals_cache.get(co)
-    if out_names is None:
-        names = co.co_names
-        out_names = {names[oparg] for _, oparg in _walk_global_ops(co)}
-
-        # Declaring a function inside another one using the "def ..."
-        # syntax generates a constant code object corresonding to the one
-        # of the nested function's As the nested function may itself need
-        # global variables, we need to introspect its code, extract its
-        # globals, (look for code object in it's co_consts attribute..) and
-        # add the result to code_globals
-        if co.co_consts:
-            for const in co.co_consts:
-                if isinstance(const, types.CodeType):
-                    out_names |= _extract_code_globals(const)
-
-        _extract_code_globals_cache[co] = out_names
-
-    return out_names
-
-
-def _find_imported_submodules(code, top_level_dependencies):
-    """
-    Find currently imported submodules used by a function.
-
-    Submodules used by a function need to be detected and referenced for the
-    function to work correctly at depickling time. Because submodules can be
-    referenced as attribute of their parent package (``package.submodule``), we
-    need a special introspection technique that does not rely on GLOBAL-related
-    opcodes to find references of them in a code object.
-
-    Example:
-    ```
-    import concurrent.futures
-    import cloudpickle
-    def func():
-        x = concurrent.futures.ThreadPoolExecutor
-    if __name__ == '__main__':
-        cloudpickle.dumps(func)
-    ```
-    The globals extracted by cloudpickle in the function's state include the
-    concurrent package, but not its submodule (here, concurrent.futures), which
-    is the module used by func. Find_imported_submodules will detect the usage
-    of concurrent.futures. Saving this module alongside with func will ensure
-    that calling func once depickled does not fail due to concurrent.futures
-    not being imported
-    """
-
-    subimports = []
-    # check if any known dependency is an imported package
-    for x in top_level_dependencies:
-        if (isinstance(x, types.ModuleType) and
-                hasattr(x, '__package__') and x.__package__):
-            # check if the package has any currently loaded sub-imports
-            prefix = x.__name__ + '.'
-            # A concurrent thread could mutate sys.modules,
-            # make sure we iterate over a copy to avoid exceptions
-            for name in list(sys.modules):
-                # Older versions of pytest will add a "None" module to
-                # sys.modules.
-                if name is not None and name.startswith(prefix):
-                    # check whether the function can address the sub-module
-                    tokens = set(name[len(prefix):].split('.'))
-                    if not tokens - set(code.co_names):
-                        subimports.append(sys.modules[name])
-    return subimports
-
-
-def _make_cell_set_template_code():
-    """Get the Python compiler to emit LOAD_FAST(arg); STORE_DEREF
-
-    Notes
-    -----
-    In Python 3, we could use an easier function:
-
-    .. code-block:: python
-
-       def f():
-           cell = None
-
-           def _stub(value):
-               nonlocal cell
-               cell = value
-
-           return _stub
-
-        _cell_set_template_code = f().__code__
-
-    This function is _only_ a LOAD_FAST(arg); STORE_DEREF, but that is
-    invalid syntax on Python 2. If we use this function we also don't need
-    to do the weird freevars/cellvars swap below
-    """
-    def inner(value):
-        lambda: cell  # make ``cell`` a closure so that we get a STORE_DEREF
-        cell = value
-
-    co = inner.__code__
-
-    # NOTE: we are marking the cell variable as a free variable intentionally
-    # so that we simulate an inner function instead of the outer function. This
-    # is what gives us the ``nonlocal`` behavior in a Python 2 compatible way.
-    if PY2:  # pragma: no branch
-        return types.CodeType(
-            co.co_argcount,
-            co.co_nlocals,
-            co.co_stacksize,
-            co.co_flags,
-            co.co_code,
-            co.co_consts,
-            co.co_names,
-            co.co_varnames,
-            co.co_filename,
-            co.co_name,
-            co.co_firstlineno,
-            co.co_lnotab,
-            co.co_cellvars,  # this is the trickery
-            (),
-        )
-    else:
-        if hasattr(types.CodeType, "co_posonlyargcount"):  # pragma: no branch
-            return types.CodeType(
-                co.co_argcount,
-                co.co_posonlyargcount,  # Python3.8 with PEP570
-                co.co_kwonlyargcount,
-                co.co_nlocals,
-                co.co_stacksize,
-                co.co_flags,
-                co.co_code,
-                co.co_consts,
-                co.co_names,
-                co.co_varnames,
-                co.co_filename,
-                co.co_name,
-                co.co_firstlineno,
-                co.co_lnotab,
-                co.co_cellvars,  # this is the trickery
-                (),
-            )
-        else:
-            return types.CodeType(
-                co.co_argcount,
-                co.co_kwonlyargcount,
-                co.co_nlocals,
-                co.co_stacksize,
-                co.co_flags,
-                co.co_code,
-                co.co_consts,
-                co.co_names,
-                co.co_varnames,
-                co.co_filename,
-                co.co_name,
-                co.co_firstlineno,
-                co.co_lnotab,
-                co.co_cellvars,  # this is the trickery
-                (),
-            )
-
-_cell_set_template_code = _make_cell_set_template_code()
-
-
-def cell_set(cell, value):
-    """Set the value of a closure cell.
-    """
-    return types.FunctionType(
-        _cell_set_template_code,
-        {},
-        '_cell_set_inner',
-        (),
-        (cell,),
-    )(value)
-
-
-# relevant opcodes
-STORE_GLOBAL = opcode.opmap['STORE_GLOBAL']
-DELETE_GLOBAL = opcode.opmap['DELETE_GLOBAL']
-LOAD_GLOBAL = opcode.opmap['LOAD_GLOBAL']
-GLOBAL_OPS = (STORE_GLOBAL, DELETE_GLOBAL, LOAD_GLOBAL)
-HAVE_ARGUMENT = dis.HAVE_ARGUMENT
-EXTENDED_ARG = dis.EXTENDED_ARG
-
-
-_BUILTIN_TYPE_NAMES = {}
-for k, v in types.__dict__.items():
-    if type(v) is type:
-        _BUILTIN_TYPE_NAMES[v] = k
-
-
-def _builtin_type(name):
-    return getattr(types, name)
-
-
-if sys.version_info < (3, 4):  # pragma: no branch
-    def _walk_global_ops(code):
-        """
-        Yield (opcode, argument number) tuples for all
-        global-referencing instructions in *code*.
-        """
-        code = getattr(code, 'co_code', b'')
-        if PY2:  # pragma: no branch
-            code = map(ord, code)
-
-        n = len(code)
-        i = 0
-        extended_arg = 0
-        while i < n:
-            op = code[i]
-            i += 1
-            if op >= HAVE_ARGUMENT:
-                oparg = code[i] + code[i + 1] * 256 + extended_arg
-                extended_arg = 0
-                i += 2
-                if op == EXTENDED_ARG:
-                    extended_arg = oparg * 65536
-                if op in GLOBAL_OPS:
-                    yield op, oparg
-
-else:
-    def _walk_global_ops(code):
-        """
-        Yield (opcode, argument number) tuples for all
-        global-referencing instructions in *code*.
-        """
-        for instr in dis.get_instructions(code):
-            op = instr.opcode
-            if op in GLOBAL_OPS:
-                yield op, instr.arg
-
-
-def _extract_class_dict(cls):
-    """Retrieve a copy of the dict of a class without the inherited methods"""
-    clsdict = dict(cls.__dict__)  # copy dict proxy to a dict
-    if len(cls.__bases__) == 1:
-        inherited_dict = cls.__bases__[0].__dict__
-    else:
-        inherited_dict = {}
-        for base in reversed(cls.__bases__):
-            inherited_dict.update(base.__dict__)
-    to_remove = []
-    for name, value in clsdict.items():
-        try:
-            base_value = inherited_dict[name]
-            if value is base_value:
-                to_remove.append(name)
-        except KeyError:
-            pass
-    for name in to_remove:
-        clsdict.pop(name)
-    return clsdict
-
-
-class CloudPickler(Pickler):
-
-    dispatch = Pickler.dispatch.copy()
-
-    def __init__(self, file, protocol=None):
-        if protocol is None:
-            protocol = DEFAULT_PROTOCOL
-        Pickler.__init__(self, file, protocol=protocol)
-        # map ids to dictionary. used to ensure that functions can share global env
-        self.globals_ref = {}
-
-    def dump(self, obj):
-        self.inject_addons()
-        try:
-            return Pickler.dump(self, obj)
-        except RuntimeError as e:
-            if 'recursion' in e.args[0]:
-                msg = """Could not pickle object as excessively deep recursion required."""
-                raise pickle.PicklingError(msg)
-            else:
-                raise
-
-    def save_memoryview(self, obj):
-        self.save(obj.tobytes())
-
-    dispatch[memoryview] = save_memoryview
-
-    if PY2:  # pragma: no branch
-        def save_buffer(self, obj):
-            self.save(str(obj))
-
-        dispatch[buffer] = save_buffer  # noqa: F821 'buffer' was removed in Python 3
-
-    def save_module(self, obj):
-        """
-        Save a module as an import
-        """
-        if _is_dynamic(obj):
-            self.save_reduce(dynamic_subimport, (obj.__name__, vars(obj)),
-                             obj=obj)
-        else:
-            self.save_reduce(subimport, (obj.__name__,), obj=obj)
-
-    dispatch[types.ModuleType] = save_module
-
-    def save_codeobject(self, obj):
-        """
-        Save a code object
-        """
-        if PY3:  # pragma: no branch
-            if hasattr(obj, "co_posonlyargcount"):  # pragma: no branch
-                args = (
-                    obj.co_argcount, obj.co_posonlyargcount,
-                    obj.co_kwonlyargcount, obj.co_nlocals, obj.co_stacksize,
-                    obj.co_flags, obj.co_code, obj.co_consts, obj.co_names,
-                    obj.co_varnames, obj.co_filename, obj.co_name,
-                    obj.co_firstlineno, obj.co_lnotab, obj.co_freevars,
-                    obj.co_cellvars
-                )
-            else:
-                args = (
-                    obj.co_argcount, obj.co_kwonlyargcount, obj.co_nlocals,
-                    obj.co_stacksize, obj.co_flags, obj.co_code, obj.co_consts,
-                    obj.co_names, obj.co_varnames, obj.co_filename,
-                    obj.co_name, obj.co_firstlineno, obj.co_lnotab,
-                    obj.co_freevars, obj.co_cellvars
-                )
-        else:
-            args = (
-                obj.co_argcount, obj.co_nlocals, obj.co_stacksize, obj.co_flags, obj.co_code,
-                obj.co_consts, obj.co_names, obj.co_varnames, obj.co_filename, obj.co_name,
-                obj.co_firstlineno, obj.co_lnotab, obj.co_freevars, obj.co_cellvars
-            )
-        self.save_reduce(types.CodeType, args, obj=obj)
-
-    dispatch[types.CodeType] = save_codeobject
-
-    def save_function(self, obj, name=None):
-        """ Registered with the dispatch to handle all function types.
-
-        Determines what kind of function obj is (e.g. lambda, defined at
-        interactive prompt, etc) and handles the pickling appropriately.
-        """
-        if _is_global(obj, name=name):
-            return Pickler.save_global(self, obj, name=name)
-        elif PYPY and isinstance(obj.__code__, builtin_code_type):
-            return self.save_pypy_builtin_func(obj)
-        else:
-            return self.save_function_tuple(obj)
-
-    dispatch[types.FunctionType] = save_function
-
-    def save_pypy_builtin_func(self, obj):
-        """Save pypy equivalent of builtin functions.
-
-        PyPy does not have the concept of builtin-functions. Instead,
-        builtin-functions are simple function instances, but with a
-        builtin-code attribute.
-        Most of the time, builtin functions should be pickled by attribute. But
-        PyPy has flaky support for __qualname__, so some builtin functions such
-        as float.__new__ will be classified as dynamic. For this reason only,
-        we created this special routine. Because builtin-functions are not
-        expected to have closure or globals, there is no additional hack
-        (compared the one already implemented in pickle) to protect ourselves
-        from reference cycles. A simple (reconstructor, newargs, obj.__dict__)
-        tuple is save_reduced.
-
-        Note also that PyPy improved their support for __qualname__ in v3.6, so
-        this routing should be removed when cloudpickle supports only PyPy 3.6
-        and later.
-        """
-        rv = (types.FunctionType, (obj.__code__, {}, obj.__name__,
-                                   obj.__defaults__, obj.__closure__),
-              obj.__dict__)
-        self.save_reduce(*rv, obj=obj)
-
-    def _save_dynamic_enum(self, obj, clsdict):
-        """Special handling for dynamic Enum subclasses
-
-        Use a dedicated Enum constructor (inspired by EnumMeta.__call__) as the
-        EnumMeta metaclass has complex initialization that makes the Enum
-        subclasses hold references to their own instances.
-        """
-        members = dict((e.name, e.value) for e in obj)
-
-        # Python 2.7 with enum34 can have no qualname:
-        qualname = getattr(obj, "__qualname__", None)
-
-        self.save_reduce(_make_skeleton_enum,
-                         (obj.__bases__, obj.__name__, qualname, members,
-                          obj.__module__, _ensure_tracking(obj), None),
-                         obj=obj)
-
-        # Cleanup the clsdict that will be passed to _rehydrate_skeleton_class:
-        # Those attributes are already handled by the metaclass.
-        for attrname in ["_generate_next_value_", "_member_names_",
-                         "_member_map_", "_member_type_",
-                         "_value2member_map_"]:
-            clsdict.pop(attrname, None)
-        for member in members:
-            clsdict.pop(member)
-
-    def save_dynamic_class(self, obj):
-        """Save a class that can't be stored as module global.
-
-        This method is used to serialize classes that are defined inside
-        functions, or that otherwise can't be serialized as attribute lookups
-        from global modules.
-        """
-        clsdict = _extract_class_dict(obj)
-        clsdict.pop('__weakref__', None)
-
-        # For ABCMeta in python3.7+, remove _abc_impl as it is not picklable.
-        # This is a fix which breaks the cache but this only makes the first
-        # calls to issubclass slower.
-        if "_abc_impl" in clsdict:
-            import abc
-            (registry, _, _, _) = abc._get_dump(obj)
-            clsdict["_abc_impl"] = [subclass_weakref()
-                                    for subclass_weakref in registry]
-
-        # On PyPy, __doc__ is a readonly attribute, so we need to include it in
-        # the initial skeleton class.  This is safe because we know that the
-        # doc can't participate in a cycle with the original class.
-        type_kwargs = {'__doc__': clsdict.pop('__doc__', None)}
-
-        if hasattr(obj, "__slots__"):
-            type_kwargs['__slots__'] = obj.__slots__
-            # pickle string length optimization: member descriptors of obj are
-            # created automatically from obj's __slots__ attribute, no need to
-            # save them in obj's state
-            if isinstance(obj.__slots__, string_types):
-                clsdict.pop(obj.__slots__)
-            else:
-                for k in obj.__slots__:
-                    clsdict.pop(k, None)
-
-        # If type overrides __dict__ as a property, include it in the type
-        # kwargs. In Python 2, we can't set this attribute after construction.
-        __dict__ = clsdict.pop('__dict__', None)
-        if isinstance(__dict__, property):
-            type_kwargs['__dict__'] = __dict__
-
-        save = self.save
-        write = self.write
-
-        # We write pickle instructions explicitly here to handle the
-        # possibility that the type object participates in a cycle with its own
-        # __dict__. We first write an empty "skeleton" version of the class and
-        # memoize it before writing the class' __dict__ itself. We then write
-        # instructions to "rehydrate" the skeleton class by restoring the
-        # attributes from the __dict__.
-        #
-        # A type can appear in a cycle with its __dict__ if an instance of the
-        # type appears in the type's __dict__ (which happens for the stdlib
-        # Enum class), or if the type defines methods that close over the name
-        # of the type, (which is common for Python 2-style super() calls).
-
-        # Push the rehydration function.
-        save(_rehydrate_skeleton_class)
-
-        # Mark the start of the args tuple for the rehydration function.
-        write(pickle.MARK)
-
-        # Create and memoize an skeleton class with obj's name and bases.
-        if Enum is not None and issubclass(obj, Enum):
-            # Special handling of Enum subclasses
-            self._save_dynamic_enum(obj, clsdict)
-        else:
-            # "Regular" class definition:
-            tp = type(obj)
-            self.save_reduce(_make_skeleton_class,
-                             (tp, obj.__name__, obj.__bases__, type_kwargs,
-                              _ensure_tracking(obj), None),
-                             obj=obj)
-
-        # Now save the rest of obj's __dict__. Any references to obj
-        # encountered while saving will point to the skeleton class.
-        save(clsdict)
-
-        # Write a tuple of (skeleton_class, clsdict).
-        write(pickle.TUPLE)
-
-        # Call _rehydrate_skeleton_class(skeleton_class, clsdict)
-        write(pickle.REDUCE)
-
-    def save_function_tuple(self, func):
-        """  Pickles an actual func object.
-
-        A func comprises: code, globals, defaults, closure, and dict.  We
-        extract and save these, injecting reducing functions at certain points
-        to recreate the func object.  Keep in mind that some of these pieces
-        can contain a ref to the func itself.  Thus, a naive save on these
-        pieces could trigger an infinite loop of save's.  To get around that,
-        we first create a skeleton func object using just the code (this is
-        safe, since this won't contain a ref to the func), and memoize it as
-        soon as it's created.  The other stuff can then be filled in later.
-        """
-        if is_tornado_coroutine(func):
-            self.save_reduce(_rebuild_tornado_coroutine, (func.__wrapped__,),
-                             obj=func)
-            return
-
-        save = self.save
-        write = self.write
-
-        code, f_globals, defaults, closure_values, dct, base_globals = self.extract_func_data(func)
-
-        save(_fill_function)  # skeleton function updater
-        write(pickle.MARK)    # beginning of tuple that _fill_function expects
-
-        # Extract currently-imported submodules used by func. Storing these
-        # modules in a smoke _cloudpickle_subimports attribute of the object's
-        # state will trigger the side effect of importing these modules at
-        # unpickling time (which is necessary for func to work correctly once
-        # depickled)
-        submodules = _find_imported_submodules(
-            code,
-            itertools.chain(f_globals.values(), closure_values or ()),
-        )
-
-        # create a skeleton function object and memoize it
-        save(_make_skel_func)
-        save((
-            code,
-            len(closure_values) if closure_values is not None else -1,
-            base_globals,
-        ))
-        write(pickle.REDUCE)
-        self.memoize(func)
-
-        # save the rest of the func data needed by _fill_function
-        state = {
-            'globals': f_globals,
-            'defaults': defaults,
-            'dict': dct,
-            'closure_values': closure_values,
-            'module': func.__module__,
-            'name': func.__name__,
-            'doc': func.__doc__,
-            '_cloudpickle_submodules': submodules
-        }
-        if hasattr(func, '__annotations__') and sys.version_info >= (3, 4):
-            state['annotations'] = func.__annotations__
-        if hasattr(func, '__qualname__'):
-            state['qualname'] = func.__qualname__
-        if hasattr(func, '__kwdefaults__'):
-            state['kwdefaults'] = func.__kwdefaults__
-        save(state)
-        write(pickle.TUPLE)
-        write(pickle.REDUCE)  # applies _fill_function on the tuple
-
-    def extract_func_data(self, func):
-        """
-        Turn the function into a tuple of data necessary to recreate it:
-            code, globals, defaults, closure_values, dict
-        """
-        code = func.__code__
-
-        # extract all global ref's
-        func_global_refs = _extract_code_globals(code)
-
-        # process all variables referenced by global environment
-        f_globals = {}
-        for var in func_global_refs:
-            if var in func.__globals__:
-                f_globals[var] = func.__globals__[var]
-
-        # defaults requires no processing
-        defaults = func.__defaults__
-
-        # process closure
-        closure = (
-            list(map(_get_cell_contents, func.__closure__))
-            if func.__closure__ is not None
-            else None
-        )
-
-        # save the dict
-        dct = func.__dict__
-
-        # base_globals represents the future global namespace of func at
-        # unpickling time. Looking it up and storing it in globals_ref allow
-        # functions sharing the same globals at pickling time to also
-        # share them once unpickled, at one condition: since globals_ref is
-        # an attribute of a Cloudpickler instance, and that a new CloudPickler is
-        # created each time pickle.dump or pickle.dumps is called, functions
-        # also need to be saved within the same invokation of
-        # cloudpickle.dump/cloudpickle.dumps (for example: cloudpickle.dumps([f1, f2])). There
-        # is no such limitation when using Cloudpickler.dump, as long as the
-        # multiple invokations are bound to the same Cloudpickler.
-        base_globals = self.globals_ref.setdefault(id(func.__globals__), {})
-
-        if base_globals == {}:
-            # Add module attributes used to resolve relative imports
-            # instructions inside func.
-            for k in ["__package__", "__name__", "__path__", "__file__"]:
-                # Some built-in functions/methods such as object.__new__  have
-                # their __globals__ set to None in PyPy
-                if func.__globals__ is not None and k in func.__globals__:
-                    base_globals[k] = func.__globals__[k]
-
-        return (code, f_globals, defaults, closure, dct, base_globals)
-
-    if not PY3:  # pragma: no branch
-        # Python3 comes with native reducers that allow builtin functions and
-        # methods pickling as module/class attributes.  The following method
-        # extends this for python2.
-        # Please note that currently, neither pickle nor cloudpickle support
-        # dynamically created builtin functions/method pickling.
-        def save_builtin_function_or_method(self, obj):
-            is_bound = getattr(obj, '__self__', None) is not None
-            if is_bound:
-                # obj is a bound builtin method.
-                rv = (getattr, (obj.__self__, obj.__name__))
-                return self.save_reduce(obj=obj, *rv)
-
-            is_unbound = hasattr(obj, '__objclass__')
-            if is_unbound:
-                # obj is an unbound builtin method (accessed from its class)
-                rv = (getattr, (obj.__objclass__, obj.__name__))
-                return self.save_reduce(obj=obj, *rv)
-
-            # Otherwise, obj is not a method, but a function. Fallback to
-            # default pickling by attribute.
-            return Pickler.save_global(self, obj)
-
-        dispatch[types.BuiltinFunctionType] = save_builtin_function_or_method
-
-        # A comprehensive summary of the various kinds of builtin methods can
-        # be found in PEP 579: https://www.python.org/dev/peps/pep-0579/
-        classmethod_descriptor_type = type(float.__dict__['fromhex'])
-        wrapper_descriptor_type = type(float.__repr__)
-        method_wrapper_type = type(1.5.__repr__)
-
-        dispatch[classmethod_descriptor_type] = save_builtin_function_or_method
-        dispatch[wrapper_descriptor_type] = save_builtin_function_or_method
-        dispatch[method_wrapper_type] = save_builtin_function_or_method
-
-    if sys.version_info[:2] < (3, 4):
-        method_descriptor = type(str.upper)
-        dispatch[method_descriptor] = save_builtin_function_or_method
-
-    def save_global(self, obj, name=None, pack=struct.pack):
-        """
-        Save a "global".
-
-        The name of this method is somewhat misleading: all types get
-        dispatched here.
-        """
-        if obj is type(None):
-            return self.save_reduce(type, (None,), obj=obj)
-        elif obj is type(Ellipsis):
-            return self.save_reduce(type, (Ellipsis,), obj=obj)
-        elif obj is type(NotImplemented):
-            return self.save_reduce(type, (NotImplemented,), obj=obj)
-        elif obj in _BUILTIN_TYPE_NAMES:
-            return self.save_reduce(
-                _builtin_type, (_BUILTIN_TYPE_NAMES[obj],), obj=obj)
-        elif name is not None:
-            Pickler.save_global(self, obj, name=name)
-        elif not _is_global(obj, name=name):
-            self.save_dynamic_class(obj)
-        else:
-            Pickler.save_global(self, obj, name=name)
-
-    dispatch[type] = save_global
-    dispatch[types.ClassType] = save_global
-
-    def save_instancemethod(self, obj):
-        # Memoization rarely is ever useful due to python bounding
-        if obj.__self__ is None:
-            self.save_reduce(getattr, (obj.im_class, obj.__name__))
-        else:
-            if PY3:  # pragma: no branch
-                self.save_reduce(types.MethodType, (obj.__func__, obj.__self__), obj=obj)
-            else:
-                self.save_reduce(types.MethodType, (obj.__func__, obj.__self__, obj.__self__.__class__),
-                                 obj=obj)
-
-    dispatch[types.MethodType] = save_instancemethod
-
-    def save_inst(self, obj):
-        """Inner logic to save instance. Based off pickle.save_inst"""
-        cls = obj.__class__
-
-        # Try the dispatch table (pickle module doesn't do it)
-        f = self.dispatch.get(cls)
-        if f:
-            f(self, obj)  # Call unbound method with explicit self
-            return
-
-        memo = self.memo
-        write = self.write
-        save = self.save
-
-        if hasattr(obj, '__getinitargs__'):
-            args = obj.__getinitargs__()
-            len(args)  # XXX Assert it's a sequence
-            pickle._keep_alive(args, memo)
-        else:
-            args = ()
-
-        write(pickle.MARK)
-
-        if self.bin:
-            save(cls)
-            for arg in args:
-                save(arg)
-            write(pickle.OBJ)
-        else:
-            for arg in args:
-                save(arg)
-            write(pickle.INST + cls.__module__ + '\n' + cls.__name__ + '\n')
-
-        self.memoize(obj)
-
-        try:
-            getstate = obj.__getstate__
-        except AttributeError:
-            stuff = obj.__dict__
-        else:
-            stuff = getstate()
-            pickle._keep_alive(stuff, memo)
-        save(stuff)
-        write(pickle.BUILD)
-
-    if PY2:  # pragma: no branch
-        dispatch[types.InstanceType] = save_inst
-
-    def save_property(self, obj):
-        # properties not correctly saved in python
-        self.save_reduce(property, (obj.fget, obj.fset, obj.fdel, obj.__doc__), obj=obj)
-
-    dispatch[property] = save_property
-
-    def save_classmethod(self, obj):
-        orig_func = obj.__func__
-        self.save_reduce(type(obj), (orig_func,), obj=obj)
-
-    dispatch[classmethod] = save_classmethod
-    dispatch[staticmethod] = save_classmethod
-
-    def save_itemgetter(self, obj):
-        """itemgetter serializer (needed for namedtuple support)"""
-        class Dummy:
-            def __getitem__(self, item):
-                return item
-        items = obj(Dummy())
-        if not isinstance(items, tuple):
-            items = (items,)
-        return self.save_reduce(operator.itemgetter, items)
-
-    if type(operator.itemgetter) is type:
-        dispatch[operator.itemgetter] = save_itemgetter
-
-    def save_attrgetter(self, obj):
-        """attrgetter serializer"""
-        class Dummy(object):
-            def __init__(self, attrs, index=None):
-                self.attrs = attrs
-                self.index = index
-            def __getattribute__(self, item):
-                attrs = object.__getattribute__(self, "attrs")
-                index = object.__getattribute__(self, "index")
-                if index is None:
-                    index = len(attrs)
-                    attrs.append(item)
-                else:
-                    attrs[index] = ".".join([attrs[index], item])
-                return type(self)(attrs, index)
-        attrs = []
-        obj(Dummy(attrs))
-        return self.save_reduce(operator.attrgetter, tuple(attrs))
-
-    if type(operator.attrgetter) is type:
-        dispatch[operator.attrgetter] = save_attrgetter
-
-    def save_file(self, obj):
-        """Save a file"""
-        try:
-            import StringIO as pystringIO  # we can't use cStringIO as it lacks the name attribute
-        except ImportError:
-            import io as pystringIO
-
-        if not hasattr(obj, 'name') or not hasattr(obj, 'mode'):
-            raise pickle.PicklingError("Cannot pickle files that do not map to an actual file")
-        if obj is sys.stdout:
-            return self.save_reduce(getattr, (sys, 'stdout'), obj=obj)
-        if obj is sys.stderr:
-            return self.save_reduce(getattr, (sys, 'stderr'), obj=obj)
-        if obj is sys.stdin:
-            raise pickle.PicklingError("Cannot pickle standard input")
-        if obj.closed:
-            raise pickle.PicklingError("Cannot pickle closed files")
-        if hasattr(obj, 'isatty') and obj.isatty():
-            raise pickle.PicklingError("Cannot pickle files that map to tty objects")
-        if 'r' not in obj.mode and '+' not in obj.mode:
-            raise pickle.PicklingError("Cannot pickle files that are not opened for reading: %s" % obj.mode)
-
-        name = obj.name
-
-        retval = pystringIO.StringIO()
-
-        try:
-            # Read the whole file
-            curloc = obj.tell()
-            obj.seek(0)
-            contents = obj.read()
-            obj.seek(curloc)
-        except IOError:
-            raise pickle.PicklingError("Cannot pickle file %s as it cannot be read" % name)
-        retval.write(contents)
-        retval.seek(curloc)
-
-        retval.name = name
-        self.save(retval)
-        self.memoize(obj)
-
-    def save_ellipsis(self, obj):
-        self.save_reduce(_gen_ellipsis, ())
-
-    def save_not_implemented(self, obj):
-        self.save_reduce(_gen_not_implemented, ())
-
-    try:               # Python 2
-        dispatch[file] = save_file
-    except NameError:  # Python 3  # pragma: no branch
-        dispatch[io.TextIOWrapper] = save_file
-
-    dispatch[type(Ellipsis)] = save_ellipsis
-    dispatch[type(NotImplemented)] = save_not_implemented
-
-    def save_weakset(self, obj):
-        self.save_reduce(weakref.WeakSet, (list(obj),))
-
-    dispatch[weakref.WeakSet] = save_weakset
-
-    def save_logger(self, obj):
-        self.save_reduce(logging.getLogger, (obj.name,), obj=obj)
-
-    dispatch[logging.Logger] = save_logger
-
-    def save_root_logger(self, obj):
-        self.save_reduce(logging.getLogger, (), obj=obj)
-
-    dispatch[logging.RootLogger] = save_root_logger
-
-    if hasattr(types, "MappingProxyType"):  # pragma: no branch
-        def save_mappingproxy(self, obj):
-            self.save_reduce(types.MappingProxyType, (dict(obj),), obj=obj)
-
-        dispatch[types.MappingProxyType] = save_mappingproxy
-
-    """Special functions for Add-on libraries"""
-    def inject_addons(self):
-        """Plug in system. Register additional pickling functions if modules already loaded"""
-        pass
-
-
-# Tornado support
-
-def is_tornado_coroutine(func):
-    """
-    Return whether *func* is a Tornado coroutine function.
-    Running coroutines are not supported.
-    """
-    if 'tornado.gen' not in sys.modules:
-        return False
-    gen = sys.modules['tornado.gen']
-    if not hasattr(gen, "is_coroutine_function"):
-        # Tornado version is too old
-        return False
-    return gen.is_coroutine_function(func)
-
-
-def _rebuild_tornado_coroutine(func):
-    from tornado import gen
-    return gen.coroutine(func)
-
-
-# Shorthands for legacy support
-
-def dump(obj, file, protocol=None):
-    """Serialize obj as bytes streamed into file
-
-    protocol defaults to cloudpickle.DEFAULT_PROTOCOL which is an alias to
-    pickle.HIGHEST_PROTOCOL. This setting favors maximum communication speed
-    between processes running the same Python version.
-
-    Set protocol=pickle.DEFAULT_PROTOCOL instead if you need to ensure
-    compatibility with older versions of Python.
-    """
-    CloudPickler(file, protocol=protocol).dump(obj)
-
-
-def dumps(obj, protocol=None):
-    """Serialize obj as a string of bytes allocated in memory
-
-    protocol defaults to cloudpickle.DEFAULT_PROTOCOL which is an alias to
-    pickle.HIGHEST_PROTOCOL. This setting favors maximum communication speed
-    between processes running the same Python version.
-
-    Set protocol=pickle.DEFAULT_PROTOCOL instead if you need to ensure
-    compatibility with older versions of Python.
-    """
-    file = StringIO()
-    try:
-        cp = CloudPickler(file, protocol=protocol)
-        cp.dump(obj)
-        return file.getvalue()
-    finally:
-        file.close()
-
-
-# including pickles unloading functions in this namespace
-load = pickle.load
-loads = pickle.loads
-
-
-# hack for __import__ not working as desired
-def subimport(name):
-    __import__(name)
-    return sys.modules[name]
-
-
-def dynamic_subimport(name, vars):
-    mod = types.ModuleType(name)
-    mod.__dict__.update(vars)
-    return mod
-
-
-def _gen_ellipsis():
-    return Ellipsis
-
-
-def _gen_not_implemented():
-    return NotImplemented
-
-
-def _get_cell_contents(cell):
-    try:
-        return cell.cell_contents
-    except ValueError:
-        # sentinel used by ``_fill_function`` which will leave the cell empty
-        return _empty_cell_value
-
-
-def instance(cls):
-    """Create a new instance of a class.
-
-    Parameters
-    ----------
-    cls : type
-        The class to create an instance of.
-
-    Returns
-    -------
-    instance : cls
-        A new instance of ``cls``.
-    """
-    return cls()
-
-
-@instance
-class _empty_cell_value(object):
-    """sentinel for empty closures
-    """
-    @classmethod
-    def __reduce__(cls):
-        return cls.__name__
-
-
-def _fill_function(*args):
-    """Fills in the rest of function data into the skeleton function object
-
-    The skeleton itself is create by _make_skel_func().
-    """
-    if len(args) == 2:
-        func = args[0]
-        state = args[1]
-    elif len(args) == 5:
-        # Backwards compat for cloudpickle v0.4.0, after which the `module`
-        # argument was introduced
-        func = args[0]
-        keys = ['globals', 'defaults', 'dict', 'closure_values']
-        state = dict(zip(keys, args[1:]))
-    elif len(args) == 6:
-        # Backwards compat for cloudpickle v0.4.1, after which the function
-        # state was passed as a dict to the _fill_function it-self.
-        func = args[0]
-        keys = ['globals', 'defaults', 'dict', 'module', 'closure_values']
-        state = dict(zip(keys, args[1:]))
-    else:
-        raise ValueError('Unexpected _fill_value arguments: %r' % (args,))
-
-    # - At pickling time, any dynamic global variable used by func is
-    #   serialized by value (in state['globals']).
-    # - At unpickling time, func's __globals__ attribute is initialized by
-    #   first retrieving an empty isolated namespace that will be shared
-    #   with other functions pickled from the same original module
-    #   by the same CloudPickler instance and then updated with the
-    #   content of state['globals'] to populate the shared isolated
-    #   namespace with all the global variables that are specifically
-    #   referenced for this function.
-    func.__globals__.update(state['globals'])
-
-    func.__defaults__ = state['defaults']
-    func.__dict__ = state['dict']
-    if 'annotations' in state:
-        func.__annotations__ = state['annotations']
-    if 'doc' in state:
-        func.__doc__  = state['doc']
-    if 'name' in state:
-        func.__name__ = state['name']
-    if 'module' in state:
-        func.__module__ = state['module']
-    if 'qualname' in state:
-        func.__qualname__ = state['qualname']
-    if 'kwdefaults' in state:
-        func.__kwdefaults__ = state['kwdefaults']
-    # _cloudpickle_subimports is a set of submodules that must be loaded for
-    # the pickled function to work correctly at unpickling time. Now that these
-    # submodules are depickled (hence imported), they can be removed from the
-    # object's state (the object state only served as a reference holder to
-    # these submodules)
-    if '_cloudpickle_submodules' in state:
-        state.pop('_cloudpickle_submodules')
-
-    cells = func.__closure__
-    if cells is not None:
-        for cell, value in zip(cells, state['closure_values']):
-            if value is not _empty_cell_value:
-                cell_set(cell, value)
-
-    return func
-
-
-def _make_empty_cell():
-    if False:
-        # trick the compiler into creating an empty cell in our lambda
-        cell = None
-        raise AssertionError('this route should not be executed')
-
-    return (lambda: cell).__closure__[0]
-
-
-def _make_skel_func(code, cell_count, base_globals=None):
-    """ Creates a skeleton function object that contains just the provided
-        code and the correct number of cells in func_closure.  All other
-        func attributes (e.g. func_globals) are empty.
-    """
-    # This is backward-compatibility code: for cloudpickle versions between
-    # 0.5.4 and 0.7, base_globals could be a string or None. base_globals
-    # should now always be a dictionary.
-    if base_globals is None or isinstance(base_globals, str):
-        base_globals = {}
-
-    base_globals['__builtins__'] = __builtins__
-
-    closure = (
-        tuple(_make_empty_cell() for _ in range(cell_count))
-        if cell_count >= 0 else
-        None
-    )
-    return types.FunctionType(code, base_globals, None, None, closure)
-
-
-def _make_skeleton_class(type_constructor, name, bases, type_kwargs,
-                         class_tracker_id, extra):
-    """Build dynamic class with an empty __dict__ to be filled once memoized
-
-    If class_tracker_id is not None, try to lookup an existing class definition
-    matching that id. If none is found, track a newly reconstructed class
-    definition under that id so that other instances stemming from the same
-    class id will also reuse this class definition.
-
-    The "extra" variable is meant to be a dict (or None) that can be used for
-    forward compatibility shall the need arise.
-    """
-    skeleton_class = type_constructor(name, bases, type_kwargs)
-    return _lookup_class_or_track(class_tracker_id, skeleton_class)
-
-
-def _rehydrate_skeleton_class(skeleton_class, class_dict):
-    """Put attributes from `class_dict` back on `skeleton_class`.
-
-    See CloudPickler.save_dynamic_class for more info.
-    """
-    registry = None
-    for attrname, attr in class_dict.items():
-        if attrname == "_abc_impl":
-            registry = attr
-        else:
-            setattr(skeleton_class, attrname, attr)
-    if registry is not None:
-        for subclass in registry:
-            skeleton_class.register(subclass)
-
-    return skeleton_class
-
-
-def _make_skeleton_enum(bases, name, qualname, members, module,
-                        class_tracker_id, extra):
-    """Build dynamic enum with an empty __dict__ to be filled once memoized
-
-    The creation of the enum class is inspired by the code of
-    EnumMeta._create_.
-
-    If class_tracker_id is not None, try to lookup an existing enum definition
-    matching that id. If none is found, track a newly reconstructed enum
-    definition under that id so that other instances stemming from the same
-    class id will also reuse this enum definition.
-
-    The "extra" variable is meant to be a dict (or None) that can be used for
-    forward compatibility shall the need arise.
-    """
-    # enums always inherit from their base Enum class at the last position in
-    # the list of base classes:
-    enum_base = bases[-1]
-    metacls = enum_base.__class__
-    classdict = metacls.__prepare__(name, bases)
-
-    for member_name, member_value in members.items():
-        classdict[member_name] = member_value
-    enum_class = metacls.__new__(metacls, name, bases, classdict)
-    enum_class.__module__ = module
-
-    # Python 2.7 compat
-    if qualname is not None:
-        enum_class.__qualname__ = qualname
-
-    return _lookup_class_or_track(class_tracker_id, enum_class)
-
-
-def _is_dynamic(module):
-    """
-    Return True if the module is special module that cannot be imported by its
-    name.
-    """
-    # Quick check: module that have __file__ attribute are not dynamic modules.
-    if hasattr(module, '__file__'):
-        return False
-
-    if hasattr(module, '__spec__'):
-        if module.__spec__ is not None:
-            return False
-
-        # In PyPy, Some built-in modules such as _codecs can have their
-        # __spec__ attribute set to None despite being imported.  For such
-        # modules, the ``_find_spec`` utility of the standard library is used.
-        parent_name = module.__name__.rpartition('.')[0]
-        if parent_name:  # pragma: no cover
-            # This code handles the case where an imported package (and not
-            # module) remains with __spec__ set to None. It is however untested
-            # as no package in the PyPy stdlib has __spec__ set to None after
-            # it is imported.
-            try:
-                parent = sys.modules[parent_name]
-            except KeyError:
-                msg = "parent {!r} not in sys.modules"
-                raise ImportError(msg.format(parent_name))
-            else:
-                pkgpath = parent.__path__
-        else:
-            pkgpath = None
-        return _find_spec(module.__name__, pkgpath, module) is None
-
-    else:
-        # Backward compat for Python 2
-        import imp
-        try:
-            path = None
-            for part in module.__name__.split('.'):
-                if path is not None:
-                    path = [path]
-                f, path, description = imp.find_module(part, path)
-                if f is not None:
-                    f.close()
-        except ImportError:
-            return True
-        return False
diff --git a/joblib/externals/loky/backend/reduction.py b/joblib/externals/loky/backend/reduction.py
index 5d5414a1a1..0bad5f637f 100644
--- a/joblib/externals/loky/backend/reduction.py
+++ b/joblib/externals/loky/backend/reduction.py
@@ -122,7 +122,7 @@ else:
 
 # global variable to change the pickler behavior
 try:
-    from joblib.externals import cloudpickle  # noqa: F401
+    import cloudpickle  # noqa: F401
     DEFAULT_ENV = "cloudpickle"
 except ImportError:
     # If cloudpickle is not present, fallback to pickle
@@ -149,7 +149,7 @@ def set_loky_pickler(loky_pickler=None):
         return
 
     if loky_pickler == "cloudpickle":
-        from joblib.externals.cloudpickle import CloudPickler as loky_pickler_cls
+        from cloudpickle import CloudPickler as loky_pickler_cls
     else:
         try:
             from importlib import import_module
diff --git a/joblib/externals/loky/cloudpickle_wrapper.py b/joblib/externals/loky/cloudpickle_wrapper.py
index 1bf41a336e..14603c5b76 100644
--- a/joblib/externals/loky/cloudpickle_wrapper.py
+++ b/joblib/externals/loky/cloudpickle_wrapper.py
@@ -2,7 +2,7 @@ import inspect
 from functools import partial
 
 try:
-    from joblib.externals.cloudpickle import dumps, loads
+    from cloudpickle import dumps, loads
     cloudpickle = True
 except ImportError:
     cloudpickle = False
diff --git a/joblib/parallel.py b/joblib/parallel.py
index 03dcd92a3f..124ea84598 100644
--- a/joblib/parallel.py
+++ b/joblib/parallel.py
@@ -29,7 +29,7 @@ from ._parallel_backends import (FallbackToBackend, MultiprocessingBackend,
                                  ThreadingBackend, SequentialBackend,
                                  LokyBackend)
 from ._compat import _basestring
-from .externals.cloudpickle import dumps, loads
+from cloudpickle import dumps, loads
 from .externals import loky
 
 # Make sure that those two classes are part of the public joblib.parallel API
diff --git a/setup.py b/setup.py
index 7d60b210a3..5ede06c44d 100755
--- a/setup.py
+++ b/setup.py
@@ -53,6 +53,6 @@ if __name__ == '__main__':
                                         'data/*.npy',
                                         'data/*.npy.z']},
           packages=['joblib', 'joblib.test', 'joblib.test.data',
-                    'joblib.externals', 'joblib.externals.cloudpickle',
+                    'joblib.externals',
                     'joblib.externals.loky', 'joblib.externals.loky.backend'],
           **extra_setuptools_args)