__init__.py

r"""
The torch package contains data structures for multi-dimensional
tensors and defines mathematical operations over these tensors.
Additionally, it provides many utilities for efficient serializing of
Tensors and arbitrary types, and other useful utilities.

It has a CUDA counterpart, that enables you to run your tensor computations
on an NVIDIA GPU with compute capability >= 3.0.
"""

import os
import sys
import platform
import textwrap
import ctypes
import warnings

if sys.version_info < (3,):
    raise Exception("Python 2 has reached end-of-life and is no longer supported by PyTorch.")

from ._utils import _import_dotted_name
from ._utils_internal import get_file_path, prepare_multiprocessing_environment, \
    USE_RTLD_GLOBAL_WITH_LIBTORCH, USE_GLOBAL_DEPS
# TODO(torch_deploy) figure out how to freeze version.py in fbcode build
if sys.executable == 'torch_deploy':
    __version__ = "torch-deploy-1.8"
else:
    from .version import __version__ as __version__
from ._six import string_classes as _string_classes

from typing import Set, Type, TYPE_CHECKING

__all__ = [
    'typename', 'is_tensor', 'is_storage', 'set_default_tensor_type',
    'set_rng_state', 'get_rng_state', 'manual_seed', 'initial_seed', 'seed',
    'save', 'load', 'set_printoptions', 'chunk', 'split', 'stack', 'matmul',
    'no_grad', 'enable_grad', 'rand', 'randn',
    'DoubleStorage', 'FloatStorage', 'LongStorage', 'IntStorage',
    'ShortStorage', 'CharStorage', 'ByteStorage', 'BoolStorage',
    'DoubleTensor', 'FloatTensor', 'LongTensor', 'IntTensor',
    'ShortTensor', 'CharTensor', 'ByteTensor', 'BoolTensor', 'Tensor',
    'lobpcg', 'use_deterministic_algorithms', 'set_deterministic',
    'are_deterministic_algorithms_enabled', 'is_deterministic',
    'set_warn_always', 'is_warn_always_enabled',
]

################################################################################
# Load the extension module
################################################################################

if sys.platform == 'win32':
    pfiles_path = os.getenv('ProgramFiles', 'C:\\Program Files')
    py_dll_path = os.path.join(sys.exec_prefix, 'Library', 'bin')
    th_dll_path = os.path.join(os.path.dirname(__file__), 'lib')

    # When users create a virtualenv that inherits the base environment,
    # we will need to add the corresponding library directory into
    # DLL search directories. Otherwise, it will rely on `PATH` which
    # is dependent on user settings.
    if sys.exec_prefix != sys.base_exec_prefix:
        base_py_dll_path = os.path.join(sys.base_exec_prefix, 'Library', 'bin')
    else:
        base_py_dll_path = ''

    dll_paths = list(filter(os.path.exists, [th_dll_path, py_dll_path, base_py_dll_path]))

    if all([not os.path.exists(os.path.join(p, 'nvToolsExt64_1.dll')) for p in dll_paths]):
        nvtoolsext_dll_path = os.path.join(
            os.getenv('NVTOOLSEXT_PATH', os.path.join(pfiles_path, 'NVIDIA Corporation', 'NvToolsExt')), 'bin', 'x64')
    else:
        nvtoolsext_dll_path = ''

    from .version import cuda as cuda_version
    import glob
    if cuda_version and all([not glob.glob(os.path.join(p, 'cudart64*.dll')) for p in dll_paths]):
        cuda_version_1 = cuda_version.replace('.', '_')
        cuda_path_var = 'CUDA_PATH_V' + cuda_version_1
        default_path = os.path.join(pfiles_path, 'NVIDIA GPU Computing Toolkit', 'CUDA', 'v' + cuda_version)
        cuda_path = os.path.join(os.getenv(cuda_path_var, default_path), 'bin')
    else:
        cuda_path = ''

    dll_paths.extend(filter(os.path.exists, [nvtoolsext_dll_path, cuda_path]))

    kernel32 = ctypes.WinDLL('kernel32.dll', use_last_error=True)
    with_load_library_flags = hasattr(kernel32, 'AddDllDirectory')
    prev_error_mode = kernel32.SetErrorMode(0x0001)

    kernel32.LoadLibraryW.restype = ctypes.c_void_p
    if with_load_library_flags:
        kernel32.AddDllDirectory.restype = ctypes.c_void_p
        kernel32.LoadLibraryExW.restype = ctypes.c_void_p

    for dll_path in dll_paths:
        if sys.version_info >= (3, 8):
            os.add_dll_directory(dll_path)
        elif with_load_library_flags:
            res = kernel32.AddDllDirectory(dll_path)
            if res is None:
                err = ctypes.WinError(ctypes.get_last_error())
                err.strerror += f' Error adding "{dll_path}" to the DLL directories.'
                raise err

    try:
        ctypes.CDLL('vcruntime140.dll')
        ctypes.CDLL('msvcp140.dll')
        if cuda_version not in ('9.2', '10.0'):
            ctypes.CDLL('vcruntime140_1.dll')
    except OSError:
        print('''Microsoft Visual C++ Redistributable is not installed, this may lead to the DLL load failure.
                 It can be downloaded at https://aka.ms/vs/16/release/vc_redist.x64.exe''')

    dlls = glob.glob(os.path.join(th_dll_path, '*.dll'))
    path_patched = False
    for dll in dlls:
        is_loaded = False
        if with_load_library_flags:
            res = kernel32.LoadLibraryExW(dll, None, 0x00001100)
            last_error = ctypes.get_last_error()
            if res is None and last_error != 126:
                err = ctypes.WinError(last_error)
                err.strerror += f' Error loading "{dll}" or one of its dependencies.'
                raise err
            elif res is not None:
                is_loaded = True
        if not is_loaded:
            if not path_patched:
                os.environ['PATH'] = ';'.join(dll_paths + [os.environ['PATH']])
                path_patched = True
            res = kernel32.LoadLibraryW(dll)
            if res is None:
                err = ctypes.WinError(ctypes.get_last_error())
                err.strerror += f' Error loading "{dll}" or one of its dependencies.'
                raise err

    kernel32.SetErrorMode(prev_error_mode)


# See Note [Global dependencies]
def _load_global_deps():
    if platform.system() == 'Windows' or sys.executable == 'torch_deploy':
        return

    lib_name = 'libtorch_global_deps' + ('.dylib' if platform.system() == 'Darwin' else '.so')
    here = os.path.abspath(__file__)
    lib_path = os.path.join(os.path.dirname(here), 'lib', lib_name)

    ctypes.CDLL(lib_path, mode=ctypes.RTLD_GLOBAL)


if (USE_RTLD_GLOBAL_WITH_LIBTORCH or os.getenv('TORCH_USE_RTLD_GLOBAL')) and \
        platform.system() != 'Windows':
    # Do it the hard way.  You might want to load libtorch with RTLD_GLOBAL in a
    # few circumstances:
    #
    #   1. You're in a build environment (e.g., fbcode) where
    #      libtorch_global_deps is not available, but you still need
    #      to get mkl to link in with RTLD_GLOBAL or it will just
    #      not work.
    #
    #   2. You're trying to run PyTorch under UBSAN and you need
    #      to ensure that only one copy of libtorch is loaded, so
    #      vptr checks work properly
    #
    # If you're using this setting, you must verify that all the libraries
    # you load consistently use the same libstdc++, or you may have
    # mysterious segfaults.
    #
    import os as _dl_flags
    if not hasattr(_dl_flags, 'RTLD_GLOBAL') or not hasattr(_dl_flags, 'RTLD_LAZY'):
        try:
            # next try if DLFCN exists
            import DLFCN as _dl_flags  # type: ignore
        except ImportError:
            # as a last attempt, use compile-time constants
            import torch._dl as _dl_flags  # type: ignore
    old_flags = sys.getdlopenflags()
    sys.setdlopenflags(_dl_flags.RTLD_GLOBAL | _dl_flags.RTLD_LAZY)
    from torch._C import *
    sys.setdlopenflags(old_flags)
    del old_flags
    del _dl_flags

else:
    # Easy way.  You want this most of the time, because it will prevent
    # C++ symbols from libtorch clobbering C++ symbols from other
    # libraries, leading to mysterious segfaults.
    #
    # If building in an environment where libtorch_global_deps isn't available
    # like parts of fbsource, but where RTLD_GLOBAL causes segfaults, you will
    # want USE_RTLD_GLOBAL_WITH_LIBTORCH = False and USE_GLOBAL_DEPS = False
    #
    # See Note [Global dependencies]
    if USE_GLOBAL_DEPS:
        _load_global_deps()
    from torch._C import *

# Appease the type checker; ordinarily this binding is inserted by the
# torch._C module initialization code in C
if TYPE_CHECKING:
    import torch._C as _C

# Check to see if we can load C extensions, and if not provide some guidance
# on what the problem might be.
try:
    # _initExtension is chosen (arbitrarily) as a sentinel.
    from torch._C import _initExtension
except ImportError:
    import torch._C as _C_for_compiled_check

    # The __file__ check only works for Python 3.7 and above.
    if sys.version_info >= (3, 7) and _C_for_compiled_check.__file__ is None:
        raise ImportError(textwrap.dedent('''
            Failed to load PyTorch C extensions:
                It appears that PyTorch has loaded the `torch/_C` folder
                of the PyTorch repository rather than the C extensions which
                are expected in the `torch._C` namespace. This can occur when
                using the `install` workflow. e.g.
                    $ python setup.py install && python -c "import torch"

                This error can generally be solved using the `develop` workflow
                    $ python setup.py develop && python -c "import torch"  # This should succeed
                or by running Python from a different directory.
            ''').strip()) from None
    raise  # If __file__ is not None the cause is unknown, so just re-raise.


__all__ += [name for name in dir(_C)
            if name[0] != '_' and
            not name.endswith('Base')]

if not TYPE_CHECKING:
    # issue 38137 and python issue 43367. Submodules of a C extension are
    # non-standard, and attributes of those submodules cannot be pickled since
    # pickle expect to be able to import them as "from _C.sub import attr"
    # which fails with "_C is not a package
    for attr in dir(_C):
        candidate = getattr(_C, attr)
        if type(candidate) is type(_C):
            # submodule
            if f'torch._C.{attr}' not in sys.modules:
                sys.modules[f'torch._C.{attr}'] = candidate


################################################################################
# Define basic utilities
################################################################################


def typename(o):
    if isinstance(o, torch.Tensor):
        return o.type()

    module = ''
    class_name = ''
    if hasattr(o, '__module__') and o.__module__ != 'builtins' \
            and o.__module__ != '__builtin__' and o.__module__ is not None:
        module = o.__module__ + '.'

    if hasattr(o, '__qualname__'):
        class_name = o.__qualname__
    elif hasattr(o, '__name__'):
        class_name = o.__name__
    else:
        class_name = o.__class__.__name__

    return module + class_name


def is_tensor(obj):
    r"""Returns True if `obj` is a PyTorch tensor.

    Note that this function is simply doing ``isinstance(obj, Tensor)``.
    Using that ``isinstance`` check is better for typechecking with mypy,
    and more explicit - so it's recommended to use that instead of
    ``is_tensor``.

    Args:
        obj (Object): Object to test
    """
    return isinstance(obj, torch.Tensor)


def is_storage(obj):
    r"""Returns True if `obj` is a PyTorch storage object.

    Args:
        obj (Object): Object to test
    """
    return type(obj) in _storage_classes


def set_default_tensor_type(t):
    r"""Sets the default ``torch.Tensor`` type to floating point tensor type
    ``t``. This type will also be used as default floating point type for
    type inference in :func:`torch.tensor`.

    The default floating point tensor type is initially ``torch.FloatTensor``.

    Args:
        t (type or string): the floating point tensor type or its name

    Example::

        >>> torch.tensor([1.2, 3]).dtype    # initial default for floating point is torch.float32
        torch.float32
        >>> torch.set_default_tensor_type(torch.DoubleTensor)
        >>> torch.tensor([1.2, 3]).dtype    # a new floating point tensor
        torch.float64

    """
    if isinstance(t, _string_classes):
        t = _import_dotted_name(t)
    _C._set_default_tensor_type(t)


def set_default_dtype(d):
    r"""Sets the default floating point dtype to :attr:`d`.
    This dtype is:

    1. The inferred dtype for python floats in :func:`torch.tensor`.
    2. Used to infer dtype for python complex numbers. The default complex dtype is set to
       ``torch.complex128`` if default floating point dtype is ``torch.float64``,
       otherwise it's set to ``torch.complex64``

    The default floating point dtype is initially ``torch.float32``.

    Args:
        d (:class:`torch.dtype`): the floating point dtype to make the default

    Example:
        >>> # initial default for floating point is torch.float32
        >>> torch.tensor([1.2, 3]).dtype
        torch.float32
        >>> # initial default for floating point is torch.complex64
        >>> torch.tensor([1.2, 3j]).dtype
        torch.complex64
        >>> torch.set_default_dtype(torch.float64)
        >>> torch.tensor([1.2, 3]).dtype    # a new floating point tensor
        torch.float64
        >>> torch.tensor([1.2, 3j]).dtype   # a new complex tensor
        torch.complex128

    """
    _C._set_default_dtype(d)

def use_deterministic_algorithms(d):
    r""" Sets whether PyTorch operations must use "deterministic"
    algorithms. That is, algorithms which, given the same input, and when
    run on the same software and hardware, always produce the same output.
    When True, operations will use deterministic algorithms when available,
    and if only nondeterministic algorithms are available they will throw a
    :class:RuntimeError when called.

    .. warning::
        This feature is in beta, and its design and implementation may change
        in the future.

    The following normally-nondeterministic operations will act
    deterministically when `d=True`:

        * :class:`torch.nn.Conv1d` when called on CUDA tensor
        * :class:`torch.nn.Conv2d` when called on CUDA tensor
        * :class:`torch.nn.Conv3d` when called on CUDA tensor
        * :class:`torch.nn.ConvTranspose1d` when called on CUDA tensor
        * :class:`torch.nn.ConvTranspose2d` when called on CUDA tensor
        * :class:`torch.nn.ConvTranspose3d` when called on CUDA tensor
        * :func:`torch.bmm` when called on sparse-dense CUDA tensors
        * :func:`torch.__getitem__` backward when `self` is a CPU tensor and
          ``indices`` is a list of tensors
        * :func:`torch.index_put` with ``accumulate=True`` when called on a CPU
          tensor

    The following normally-nondeterministic operations will throw a
    :class:`RuntimeError` when `d=True`:

        * :class:`torch.nn.AvgPool3d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.AdaptiveAvgPool2d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.AdaptiveAvgPool3d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.MaxPool3d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.AdaptiveMaxPool2d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.FractionalMaxPool2d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.FractionalMaxPool3d` when called on a CUDA tensor that requires grad
        * :func:`torch.nn.functional.interpolate` when called on a CUDA tensor that requires grad
          and one of the following modes is used:

          - `linear`
          - `bilinear`
          - `bicubic`
          - `trilinear`

        * :class:`torch.nn.ReflectionPad1d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.ReflectionPad2d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.ReplicationPad1d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.ReplicationPad2d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.ReplicationPad3d` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.NLLLoss` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.CTCLoss` when called on a CUDA tensor that requires grad
        * :class:`torch.nn.EmbeddingBag` when called on a CUDA tensor that requires grad
        * :func:`torch.scatter_add_` when called on a CUDA tensor
        * :func:`torch.index_add_` when called on a CUDA tensor
        * :func:`torch.index_copy`
        * :func:`torch.index_select` when called on a CUDA tensor that requires grad
        * :func:`torch.repeat_interleave` when called on a CUDA tensor that requires grad
        * :func:`torch.histc` when called on a CUDA tensor
        * :func:`torch.bincount` when called on a CUDA tensor
        * :func:`torch.kthvalue` with called on a CUDA tensor
        * :func:`torch.median` with indices output when called on a CUDA tensor

    A handful of CUDA operations are nondeterministic if the CUDA version is
    10.2 or greater, unless the environment variable `CUBLAS_WORKSPACE_CONFIG=:4096:8`
    or `CUBLAS_WORKSPACE_CONFIG=:16:8` is set. See the CUDA documentation for more
    details: `<https://docs.nvidia.com/cuda/cublas/index.html#cublasApi_reproducibility>`_
    If one of these environment variable configurations is not set, a :class:`RuntimeError`
    will be raised from these operations when called with CUDA tensors:

        * :func:`torch.mm`
        * :func:`torch.mv`
        * :func:`torch.bmm`

    Note that deterministic operations tend to have worse performance than
    non-deterministic operations.

    Args:
        d (:class:`bool`): If True, force operations to be deterministic.
                           If False, allow non-deterministic operations.
    """
    _C._set_deterministic_algorithms(d)

def set_deterministic(d):
    r"""This function is deprecated and will be removed in a future release.
    Please use :func:`torch.use_deterministic_algorithms` instead.
    """
    warnings.warn((
        "torch.set_deterministic is deprecated and will be removed in a future "
        "release. Please use torch.use_deterministic_algorithms instead"))

    use_deterministic_algorithms(d)

def are_deterministic_algorithms_enabled():
    r"""Returns True if the global deterministic flag is turned on. Refer to
    :func:`torch.use_deterministic_algorithms` documentation for more details.
    """
    return _C._get_deterministic_algorithms()

def is_deterministic():
    r"""This function is deprecated and will be removed in a future release.
    Please use :func:`torch.are_deterministic_algorithms_enabled` instead.
    """
    warnings.warn((
        "torch.is_deterministic is deprecated and will be removed in a future "
        "release. Please use torch.are_deterministic_algorithms_enabled instead"))
    return are_deterministic_algorithms_enabled()


def set_warn_always(b):
    r"""When this flag is False (default) then some PyTorch warnings may only
    appear once per process. This helps avoid excessive warning information.
    Setting it to True causes these warnings to always appear, which may be
    helpful when debugging.

    Args:
        b (:class:`bool`): If True, force warnings to always be emitted
                           If False, set to the default behaviour
    """
    _C._set_warnAlways(b)

def is_warn_always_enabled():
    r"""Returns True if the global warn_always flag is turned on. Refer to
    :func:`torch.set_warn_always` documentation for more details.
    """
    return _C._get_warnAlways()

################################################################################
# Define Storage and Tensor classes
################################################################################

from ._tensor import Tensor
from .storage import _StorageBase


class DoubleStorage(_C.DoubleStorageBase, _StorageBase):
    pass


class FloatStorage(_C.FloatStorageBase, _StorageBase):
    pass


class HalfStorage(_C.HalfStorageBase, _StorageBase):
    pass


class LongStorage(_C.LongStorageBase, _StorageBase):
    pass


class IntStorage(_C.IntStorageBase, _StorageBase):
    pass


class ShortStorage(_C.ShortStorageBase, _StorageBase):
    pass


class CharStorage(_C.CharStorageBase, _StorageBase):
    pass


class ByteStorage(_C.ByteStorageBase, _StorageBase):
    pass


class BoolStorage(_C.BoolStorageBase, _StorageBase):
    pass


class BFloat16Storage(_C.BFloat16StorageBase, _StorageBase):
    pass

class ComplexDoubleStorage(_C.ComplexDoubleStorageBase, _StorageBase):
    pass

class ComplexFloatStorage(_C.ComplexFloatStorageBase, _StorageBase):
    pass

class QUInt8Storage(_C.QUInt8StorageBase, _StorageBase):
    pass

class QInt8Storage(_C.QInt8StorageBase, _StorageBase):
    pass

class QInt32Storage(_C.QInt32StorageBase, _StorageBase):
    pass

class QUInt4x2Storage(_C.QUInt4x2StorageBase, _StorageBase):
    pass

_storage_classes = {
    DoubleStorage, FloatStorage, LongStorage, IntStorage, ShortStorage,
    CharStorage, ByteStorage, HalfStorage, BoolStorage, QUInt8Storage, QInt8Storage,
    QInt32Storage, BFloat16Storage, ComplexFloatStorage, ComplexDoubleStorage, QUInt4x2Storage
}

# The _tensor_classes set is initialized by the call to _C._initialize_tensor_type_bindings()
_tensor_classes: Set[Type] = set()

# If you edit these imports, please update torch/__init__.py.in as well
from .random import set_rng_state, get_rng_state, manual_seed, initial_seed, seed
from .serialization import save, load
from ._tensor_str import set_printoptions

################################################################################
# Initialize extension
################################################################################

def manager_path():
    if platform.system() == 'Windows' or sys.executable == 'torch_deploy':
        return b""
    path = get_file_path('torch', 'bin', 'torch_shm_manager')
    prepare_multiprocessing_environment(get_file_path('torch'))
    if not os.path.exists(path):
        raise RuntimeError("Unable to find torch_shm_manager at " + path)
    return path.encode('utf-8')


# Shared memory manager needs to know the exact location of manager executable
_C._initExtension(manager_path())
del manager_path

# Appease the type checker: it can't deal with direct setting of globals().
# Note that we will see "too many" functions when reexporting this way; there
# is not a good way to fix this problem.  Perhaps, try to redesign VariableFunctions
# so that this import is good enough
if TYPE_CHECKING:
    # Some type signatures pulled in from _VariableFunctions here clash with
    # signatures already imported. For now these clashes are ignored; see
    # PR #43339 for details.
    from torch._C._VariableFunctions import *  # type: ignore

for name in dir(_C._VariableFunctions):
    if name.startswith('__'):
        continue
    globals()[name] = getattr(_C._VariableFunctions, name)
    __all__.append(name)

################################################################################
# Import interface functions defined in Python
################################################################################

# needs to be after the above ATen bindings so we can overwrite from Python side
from .functional import *


################################################################################
# Remove unnecessary members
################################################################################

del DoubleStorageBase
del FloatStorageBase
del LongStorageBase
del IntStorageBase
del ShortStorageBase
del CharStorageBase
del ByteStorageBase
del BoolStorageBase
del QUInt8StorageBase
del BFloat16StorageBase
del ComplexDoubleStorageBase
del ComplexFloatStorageBase
del QUInt4x2StorageBase

################################################################################
# Define _assert
################################################################################

# needs to be before the submodule imports to avoid circular dependencies
def _assert(condition, message):
    r"""A wrapper around Python's assert which is symbolically traceable.
    """
    from .overrides import has_torch_function, handle_torch_function

    if type(condition) is not torch.Tensor and has_torch_function((condition,)):
        return handle_torch_function(_assert, (condition,), condition, message)
    assert condition, message

################################################################################
# Import most common subpackages
################################################################################

# Use the redundant form so that type checkers know that these are a part of
# the public API. The "regular" import lines are there solely for the runtime
# side effect of adding to the imported module's members for other users.

from torch import cuda as cuda
from torch import autograd as autograd
from torch.autograd import (
    no_grad as no_grad,
    enable_grad as enable_grad,
    set_grad_enabled as set_grad_enabled,
)
from torch import fft as fft
from torch import futures as futures
from torch import nn as nn
import torch.nn.intrinsic
import torch.nn.quantizable
import torch.nn.quantized
from torch import optim as optim
import torch.optim._multi_tensor
from torch import multiprocessing as multiprocessing
from torch import sparse as sparse
from torch import special as special
import torch.utils.backcompat
from torch import onnx as onnx
from torch import jit as jit
from torch import linalg as linalg
from torch import hub as hub
from torch import random as random
from torch import distributions as distributions
from torch import testing as testing
import torch.backends.cuda
import torch.backends.mkl
import torch.backends.mkldnn
import torch.backends.openmp
import torch.backends.quantized
from torch import quantization as quantization
import torch.utils.data
from torch import __config__ as __config__
from torch import __future__ as __future__
from torch import profiler as profiler

_C._init_names(list(torch._storage_classes))

# attach docstrings to torch and tensor functions
from . import _torch_docs, _tensor_docs, _storage_docs
del _torch_docs, _tensor_docs, _storage_docs


def compiled_with_cxx11_abi():
    r"""Returns whether PyTorch was built with _GLIBCXX_USE_CXX11_ABI=1"""
    return _C._GLIBCXX_USE_CXX11_ABI


# Import the ops "namespace"
from torch._ops import ops as ops
from torch._classes import classes as classes

# Import the quasi random sampler
from torch import quasirandom as quasirandom

# If you are seeing this, it means that this call site was not checked if
# the memory format could be preserved, and it was switched to old default
# behaviour of contiguous
legacy_contiguous_format = contiguous_format

# Register fork handler to initialize OpenMP in child processes (see gh-28389)
from torch.multiprocessing._atfork import register_after_fork
register_after_fork(torch.get_num_threads)
del register_after_fork

# Import tools that require fully imported torch (for applying
# torch.jit.script as a decorator, for instance):
from ._lobpcg import lobpcg as lobpcg

from ._vmap_internals import vmap as vmap

# These were previously defined in native_functions.yaml and appeared on the
# `torch` namespace, but we moved them to c10 dispatch to facilitate custom
# class usage. We add these lines here to preserve backward compatibility.
quantized_lstm = torch.ops.aten.quantized_lstm
quantized_gru = torch.ops.aten.quantized_gru