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# Copyright (c) 2010-2017 Benjamin Peterson
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import itertools
import sys
import builtins
PY2 = sys.version_info[0] == 2
PY3 = sys.version_info[0] == 3
if PY2:
inf = float('inf')
nan = float('nan')
else:
import math
inf = math.inf
nan = math.nan
if PY2:
string_classes = basestring
else:
string_classes = (str, bytes)
if PY2:
int_classes = (int, long)
else:
int_classes = int
if PY2:
FileNotFoundError = IOError
else:
FileNotFoundError = builtins.FileNotFoundError
if PY2:
import Queue as queue
else:
import queue
def with_metaclass(meta, *bases):
"""Create a base class with a metaclass."""
# This requires a bit of explanation: the basic idea is to make a dummy
# metaclass for one level of class instantiation that replaces itself with
# the actual metaclass.
class metaclass(meta):
def __new__(cls, name, this_bases, d):
return meta(name, bases, d)
return type.__new__(metaclass, 'temporary_class', (), {})
# A portable way of referring to the generator version of map
# in both Python 2 and Python 3.
if hasattr(itertools, 'imap'):
imap = itertools.imap # type: ignore
else:
imap = map # type: ignore
if PY3:
import builtins
exec_ = getattr(builtins, "exec")
else:
def exec_(_code_, _globs_=None, _locs_=None):
"""Execute code in a namespace."""
if _globs_ is None:
frame = sys._getframe(1)
_globs_ = frame.f_globals
if _locs_ is None:
_locs_ = frame.f_locals
del frame
elif _locs_ is None:
_locs_ = _globs_
exec("""exec _code_ in _globs_, _locs_""")
if sys.version_info[:2] == (3, 2):
exec_("""def raise_from(value, from_value):
try:
if from_value is None:
raise value
raise value from from_value
finally:
value = None
""")
elif sys.version_info[:2] > (3, 2):
exec_("""def raise_from(value, from_value):
try:
raise value from from_value
finally:
value = None
""")
else:
def raise_from(value, from_value):
raise value
if PY2:
import collections
container_abcs = collections
elif PY3:
import collections.abc
container_abcs = collections.abc
# Gets a function from the name of a method on a type
if PY2:
def get_function_from_type(cls, name):
method = getattr(cls, name, None)
return getattr(method, "__func__", None)
elif PY3:
def get_function_from_type(cls, name):
return getattr(cls, name, None)
if PY2:
import __builtin__ as builtins
elif PY3:
import builtins
# The codes below is not copied from the six package, so the copyright
# declaration at the beginning does not apply.
#
# Copyright(c) PyTorch contributors
#
def istuple(obj):
# Usually instances of PyStructSequence is also an instance of tuple
# but in some py2 environment it is not, so we have to manually check
# the name of the type to determine if it is a namedtupled returned
# by a pytorch operator.
t = type(obj)
return isinstance(obj, tuple) or t.__module__ == 'torch.return_types'
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