setup.py

# Welcome to the PyTorch setup.py.
#
# Environment variables you are probably interested in:
#
#   DEBUG
#     build with -O0 and -g (debug symbols)
#
#   REL_WITH_DEB_INFO
#     build with optimizations and -g (debug symbols)
#
#   MAX_JOBS
#     maximum number of compile jobs we should use to compile your code
#
#   USE_CUDA=0
#     disables CUDA build
#
#   CFLAGS
#     flags to apply to both C and C++ files to be compiled (a quirk of setup.py
#     which we have faithfully adhered to in our build system is that CFLAGS
#     also applies to C++ files (unless CXXFLAGS is set), in contrast to the
#     default behavior of autogoo and cmake build systems.)
#
#   CC
#     the C/C++ compiler to use
#
# Environment variables for feature toggles:
#
#   USE_CUDNN=0
#     disables the cuDNN build
#
#   USE_FBGEMM=0
#     disables the FBGEMM build
#
#   USE_KINETO=0
#     disables usage of libkineto library for profiling
#
#   USE_NUMPY=0
#     disables the NumPy build
#
#   BUILD_TEST=0
#     disables the test build
#
#   USE_MKLDNN=0
#     disables use of MKLDNN
#
#   USE_MKLDNN_ACL
#     enables use of Compute Library backend for MKLDNN on Arm;
#     USE_MKLDNN must be explicitly enabled.
#
#   MKLDNN_CPU_RUNTIME
#     MKL-DNN threading mode: TBB or OMP (default)
#
#   USE_NNPACK=0
#     disables NNPACK build
#
#   USE_QNNPACK=0
#     disables QNNPACK build (quantized 8-bit operators)
#
#   USE_DISTRIBUTED=0
#     disables distributed (c10d, gloo, mpi, etc.) build
#
#   USE_TENSORPIPE=0
#     disables distributed Tensorpipe backend build
#
#   USE_GLOO=0
#     disables distributed gloo backend build
#
#   USE_MPI=0
#     disables distributed MPI backend build
#
#   USE_SYSTEM_NCCL=0
#     disables use of system-wide nccl (we will use our submoduled
#     copy in third_party/nccl)
#
#   BUILD_CAFFE2_OPS=0
#     disable Caffe2 operators build
#
#   BUILD_CAFFE2=0
#     disable Caffe2 build
#
#   USE_IBVERBS
#     toggle features related to distributed support
#
#   USE_OPENCV
#     enables use of OpenCV for additional operators
#
#   USE_OPENMP=0
#     disables use of OpenMP for parallelization
#
#   USE_FFMPEG
#     enables use of ffmpeg for additional operators
#
#   USE_LEVELDB
#     enables use of LevelDB for storage
#
#   USE_LMDB
#     enables use of LMDB for storage
#
#   BUILD_BINARY
#     enables the additional binaries/ build
#
#   ATEN_AVX512_256=TRUE
#     ATen AVX2 kernels can use 32 ymm registers, instead of the default 16.
#     This option can be used if AVX512 doesn't perform well on a machine.
#     The FBGEMM library also uses AVX512_256 kernels on Xeon D processors,
#     but it also has some (optimized) assembly code.
#
#   PYTORCH_BUILD_VERSION
#   PYTORCH_BUILD_NUMBER
#     specify the version of PyTorch, rather than the hard-coded version
#     in this file; used when we're building binaries for distribution
#
#   TORCH_CUDA_ARCH_LIST
#     specify which CUDA architectures to build for.
#     ie `TORCH_CUDA_ARCH_LIST="6.0;7.0"`
#     These are not CUDA versions, instead, they specify what
#     classes of NVIDIA hardware we should generate PTX for.
#
#   ONNX_NAMESPACE
#     specify a namespace for ONNX built here rather than the hard-coded
#     one in this file; needed to build with other frameworks that share ONNX.
#
#   BLAS
#     BLAS to be used by Caffe2. Can be MKL, Eigen, ATLAS, FlexiBLAS, or OpenBLAS. If set
#     then the build will fail if the requested BLAS is not found, otherwise
#     the BLAS will be chosen based on what is found on your system.
#
#   MKL_THREADING
#     MKL threading mode: SEQ, TBB or OMP (default)
#
#   USE_REDIS
#     Whether to use Redis for distributed workflows (Linux only)
#
#   USE_ZSTD
#     Enables use of ZSTD, if the libraries are found
#
# Environment variables we respect (these environment variables are
# conventional and are often understood/set by other software.)
#
#   CUDA_HOME (Linux/OS X)
#   CUDA_PATH (Windows)
#     specify where CUDA is installed; usually /usr/local/cuda or
#     /usr/local/cuda-x.y
#   CUDAHOSTCXX
#     specify a different compiler than the system one to use as the CUDA
#     host compiler for nvcc.
#
#   CUDA_NVCC_EXECUTABLE
#     Specify a NVCC to use. This is used in our CI to point to a cached nvcc
#
#   CUDNN_LIB_DIR
#   CUDNN_INCLUDE_DIR
#   CUDNN_LIBRARY
#     specify where cuDNN is installed
#
#   MIOPEN_LIB_DIR
#   MIOPEN_INCLUDE_DIR
#   MIOPEN_LIBRARY
#     specify where MIOpen is installed
#
#   NCCL_ROOT
#   NCCL_LIB_DIR
#   NCCL_INCLUDE_DIR
#     specify where nccl is installed
#
#   NVTOOLSEXT_PATH (Windows only)
#     specify where nvtoolsext is installed
#
#   ACL_ROOT_DIR
#     specify where Compute Library is installed
#
#   LIBRARY_PATH
#   LD_LIBRARY_PATH
#     we will search for libraries in these paths
#
#   ATEN_THREADING
#     ATen parallel backend to use for intra- and inter-op parallelism
#     possible values:
#       OMP - use OpenMP for intra-op and native backend for inter-op tasks
#       NATIVE - use native thread pool for both intra- and inter-op tasks
#       TBB - using TBB for intra- and native thread pool for inter-op parallelism
#
#   USE_TBB
#      enable TBB support
#
#   USE_SYSTEM_TBB
#      Use system-provided Intel TBB.
#
#   USE_SYSTEM_LIBS (work in progress)
#      Use system-provided libraries to satisfy the build dependencies.
#      When turned on, the following cmake variables will be toggled as well:
#        USE_SYSTEM_CPUINFO=ON USE_SYSTEM_SLEEF=ON BUILD_CUSTOM_PROTOBUF=OFF

# This future is needed to print Python2 EOL message
from __future__ import print_function
import sys
if sys.version_info < (3,):
    print("Python 2 has reached end-of-life and is no longer supported by PyTorch.")
    sys.exit(-1)
if sys.platform == 'win32' and sys.maxsize.bit_length() == 31:
    print("32-bit Windows Python runtime is not supported. Please switch to 64-bit Python.")
    sys.exit(-1)

import platform
python_min_version = (3, 6, 2)
python_min_version_str = '.'.join(map(str, python_min_version))
if sys.version_info < python_min_version:
    print("You are using Python {}. Python >={} is required.".format(platform.python_version(),
                                                                     python_min_version_str))
    sys.exit(-1)

from setuptools import setup, Extension, find_packages
from collections import defaultdict
from setuptools.dist import Distribution
import setuptools.command.build_ext
import setuptools.command.install
import setuptools.command.sdist
import filecmp
import shutil
import subprocess
import os
import json
import glob
import importlib
import time
import sysconfig

from tools.build_pytorch_libs import build_caffe2
from tools.setup_helpers.env import (IS_WINDOWS, IS_DARWIN, IS_LINUX,
                                     build_type)
from tools.setup_helpers.cmake import CMake
from tools.generate_torch_version import get_torch_version

################################################################################
# Parameters parsed from environment
################################################################################

VERBOSE_SCRIPT = True
RUN_BUILD_DEPS = True
# see if the user passed a quiet flag to setup.py arguments and respect
# that in our parts of the build
EMIT_BUILD_WARNING = False
RERUN_CMAKE = False
CMAKE_ONLY = False
filtered_args = []
for i, arg in enumerate(sys.argv):
    if arg == '--cmake':
        RERUN_CMAKE = True
        continue
    if arg == '--cmake-only':
        # Stop once cmake terminates. Leave users a chance to adjust build
        # options.
        CMAKE_ONLY = True
        continue
    if arg == 'rebuild' or arg == 'build':
        arg = 'build'  # rebuild is gone, make it build
        EMIT_BUILD_WARNING = True
    if arg == "--":
        filtered_args += sys.argv[i:]
        break
    if arg == '-q' or arg == '--quiet':
        VERBOSE_SCRIPT = False
    if arg in ['clean', 'egg_info', 'sdist']:
        RUN_BUILD_DEPS = False
    filtered_args.append(arg)
sys.argv = filtered_args

if VERBOSE_SCRIPT:
    def report(*args):
        print(*args)
else:
    def report(*args):
        pass

    # Make distutils respect --quiet too
    setuptools.distutils.log.warn = report

# Constant known variables used throughout this file
cwd = os.path.dirname(os.path.abspath(__file__))
lib_path = os.path.join(cwd, "torch", "lib")
third_party_path = os.path.join(cwd, "third_party")
caffe2_build_dir = os.path.join(cwd, "build")

# CMAKE: full path to python library
if IS_WINDOWS:
    cmake_python_library = "{}/libs/python{}.lib".format(
        sysconfig.get_config_var("prefix"),
        sysconfig.get_config_var("VERSION"))
    # Fix virtualenv builds
    # TODO: Fix for python < 3.3
    if not os.path.exists(cmake_python_library):
        cmake_python_library = "{}/libs/python{}.lib".format(
            sys.base_prefix,
            sysconfig.get_config_var("VERSION"))
else:
    cmake_python_library = "{}/{}".format(
        sysconfig.get_config_var("LIBDIR"),
        sysconfig.get_config_var("INSTSONAME"))
cmake_python_include_dir = sysconfig.get_path("include")


################################################################################
# Version, create_version_file, and package_name
################################################################################
package_name = os.getenv('TORCH_PACKAGE_NAME', 'torch')
version = get_torch_version()
report("Building wheel {}-{}".format(package_name, version))

cmake = CMake()


def get_submodule_folders():
    git_modules_path = os.path.join(cwd, ".gitmodules")
    default_modules_path = [os.path.join(third_party_path, name) for name in [
                            "gloo", "cpuinfo", "tbb", "onnx",
                            "foxi", "QNNPACK", "fbgemm"
                            ]]
    if not os.path.exists(git_modules_path):
        return default_modules_path
    with open(git_modules_path) as f:
        return [os.path.join(cwd, line.split("=", 1)[1].strip()) for line in
                f.readlines() if line.strip().startswith("path")]


def check_submodules():
    def check_for_files(folder, files):
        if not any(os.path.exists(os.path.join(folder, f)) for f in files):
            report("Could not find any of {} in {}".format(", ".join(files), folder))
            report("Did you run 'git submodule update --init --recursive --jobs 0'?")
            sys.exit(1)

    def not_exists_or_empty(folder):
        return not os.path.exists(folder) or (os.path.isdir(folder) and len(os.listdir(folder)) == 0)

    if bool(os.getenv("USE_SYSTEM_LIBS", False)):
        return
    folders = get_submodule_folders()
    # If none of the submodule folders exists, try to initialize them
    if all(not_exists_or_empty(folder) for folder in folders):
        try:
            print(' --- Trying to initialize submodules')
            start = time.time()
            subprocess.check_call(["git", "submodule", "update", "--init", "--recursive"], cwd=cwd)
            end = time.time()
            print(' --- Submodule initialization took {:.2f} sec'.format(end - start))
        except Exception:
            print(' --- Submodule initalization failed')
            print('Please run:\n\tgit submodule update --init --recursive --jobs 0')
            sys.exit(1)
    for folder in folders:
        check_for_files(folder, ["CMakeLists.txt", "Makefile", "setup.py", "LICENSE", "LICENSE.md", "LICENSE.txt"])
    check_for_files(os.path.join(third_party_path, 'fbgemm', 'third_party',
                                 'asmjit'), ['CMakeLists.txt'])
    check_for_files(os.path.join(third_party_path, 'onnx', 'third_party',
                                 'benchmark'), ['CMakeLists.txt'])


# all the work we need to do _before_ setup runs
def build_deps():
    report('-- Building version ' + version)

    check_submodules()
    check_pydep('yaml', 'pyyaml')

    build_caffe2(version=version,
                 cmake_python_library=cmake_python_library,
                 build_python=True,
                 rerun_cmake=RERUN_CMAKE,
                 cmake_only=CMAKE_ONLY,
                 cmake=cmake)

    if CMAKE_ONLY:
        report('Finished running cmake. Run "ccmake build" or '
               '"cmake-gui build" to adjust build options and '
               '"python setup.py install" to build.')
        sys.exit()

    # Use copies instead of symbolic files.
    # Windows has very poor support for them.
    sym_files = [
        'tools/shared/_utils_internal.py',
        'torch/utils/benchmark/utils/valgrind_wrapper/callgrind.h',
        'torch/utils/benchmark/utils/valgrind_wrapper/valgrind.h',
    ]
    orig_files = [
        'torch/_utils_internal.py',
        'third_party/valgrind-headers/callgrind.h',
        'third_party/valgrind-headers/valgrind.h',
    ]
    for sym_file, orig_file in zip(sym_files, orig_files):
        same = False
        if os.path.exists(sym_file):
            if filecmp.cmp(sym_file, orig_file):
                same = True
            else:
                os.remove(sym_file)
        if not same:
            shutil.copyfile(orig_file, sym_file)

################################################################################
# Building dependent libraries
################################################################################

# the list of runtime dependencies required by this built package
install_requires = [
    'typing_extensions',
    'dataclasses; python_version < "3.7"'
]

missing_pydep = '''
Missing build dependency: Unable to `import {importname}`.
Please install it via `conda install {module}` or `pip install {module}`
'''.strip()


def check_pydep(importname, module):
    try:
        importlib.import_module(importname)
    except ImportError:
        raise RuntimeError(missing_pydep.format(importname=importname, module=module))


class build_ext(setuptools.command.build_ext.build_ext):

    # Copy libiomp5.dylib inside the wheel package on OS X
    def _embed_libiomp(self):
        if not IS_DARWIN:
            return
        lib_dir = os.path.join(self.build_lib, 'torch', 'lib')
        libtorch_cpu_path = os.path.join(lib_dir, 'libtorch_cpu.dylib')
        if not os.path.exists(libtorch_cpu_path):
            return
        # Parse libtorch_cpu load commands
        otool_cmds = subprocess.check_output(['otool', '-l', libtorch_cpu_path]).decode('utf-8').split('\n')
        rpaths, libs = [], []
        for idx, line in enumerate(otool_cmds):
            if line.strip() == 'cmd LC_LOAD_DYLIB':
                lib_name = otool_cmds[idx + 2].strip()
                assert lib_name.startswith('name ')
                libs.append(lib_name.split(' ', 1)[1].rsplit('(', 1)[0][:-1])

            if line.strip() == 'cmd LC_RPATH':
                rpath = otool_cmds[idx + 2].strip()
                assert rpath.startswith('path ')
                rpaths.append(rpath.split(' ', 1)[1].rsplit('(', 1)[0][:-1])

        omp_lib_name = 'libiomp5.dylib'
        if os.path.join('@rpath', omp_lib_name) not in libs:
            return

        # Copy libiomp5 from rpath locations
        for rpath in rpaths:
            source_lib = os.path.join(rpath, omp_lib_name)
            if not os.path.exists(source_lib):
                continue
            target_lib = os.path.join(self.build_lib, 'torch', 'lib', omp_lib_name)
            self.copy_file(source_lib, target_lib)
            break

    def run(self):
        # Report build options. This is run after the build completes so # `CMakeCache.txt` exists and we can get an
        # accurate report on what is used and what is not.
        cmake_cache_vars = defaultdict(lambda: False, cmake.get_cmake_cache_variables())
        if cmake_cache_vars['USE_NUMPY']:
            report('-- Building with NumPy bindings')
        else:
            report('-- NumPy not found')
        if cmake_cache_vars['USE_CUDNN']:
            report('-- Detected cuDNN at ' +
                   cmake_cache_vars['CUDNN_LIBRARY'] + ', ' + cmake_cache_vars['CUDNN_INCLUDE_DIR'])
        else:
            report('-- Not using cuDNN')
        if cmake_cache_vars['USE_CUDA']:
            report('-- Detected CUDA at ' + cmake_cache_vars['CUDA_TOOLKIT_ROOT_DIR'])
        else:
            report('-- Not using CUDA')
        if cmake_cache_vars['USE_MKLDNN']:
            report('-- Using MKLDNN')
            if cmake_cache_vars['USE_MKLDNN_ACL']:
                report('-- Using Compute Library for the Arm architecture with MKLDNN')
            else:
                report('-- Not using Compute Library for the Arm architecture with MKLDNN')
            if cmake_cache_vars['USE_MKLDNN_CBLAS']:
                report('-- Using CBLAS in MKLDNN')
            else:
                report('-- Not using CBLAS in MKLDNN')
        else:
            report('-- Not using MKLDNN')
        if cmake_cache_vars['USE_NCCL'] and cmake_cache_vars['USE_SYSTEM_NCCL']:
            report('-- Using system provided NCCL library at {}, {}'.format(cmake_cache_vars['NCCL_LIBRARIES'],
                                                                            cmake_cache_vars['NCCL_INCLUDE_DIRS']))
        elif cmake_cache_vars['USE_NCCL']:
            report('-- Building NCCL library')
        else:
            report('-- Not using NCCL')
        if cmake_cache_vars['USE_DISTRIBUTED']:
            if IS_WINDOWS:
                report('-- Building without distributed package')
            else:
                report('-- Building with distributed package: ')
                report('  -- USE_TENSORPIPE={}'.format(cmake_cache_vars['USE_TENSORPIPE']))
                report('  -- USE_GLOO={}'.format(cmake_cache_vars['USE_GLOO']))
                report('  -- USE_MPI={}'.format(cmake_cache_vars['USE_OPENMPI']))
        else:
            report('-- Building without distributed package')

        # Do not use clang to compile extensions if `-fstack-clash-protection` is defined
        # in system CFLAGS
        c_flags = str(os.getenv('CFLAGS', ''))
        if IS_LINUX and '-fstack-clash-protection' in c_flags and 'clang' in os.environ.get('CC', ''):
            os.environ['CC'] = str(os.environ['CC'])

        # It's an old-style class in Python 2.7...
        setuptools.command.build_ext.build_ext.run(self)

        self._embed_libiomp()

        # Copy the essential export library to compile C++ extensions.
        if IS_WINDOWS:
            build_temp = self.build_temp

            ext_filename = self.get_ext_filename('_C')
            lib_filename = '.'.join(ext_filename.split('.')[:-1]) + '.lib'

            export_lib = os.path.join(
                build_temp, 'torch', 'csrc', lib_filename).replace('\\', '/')

            build_lib = self.build_lib

            target_lib = os.path.join(
                build_lib, 'torch', 'lib', '_C.lib').replace('\\', '/')

            # Create "torch/lib" directory if not exists.
            # (It is not created yet in "develop" mode.)
            target_dir = os.path.dirname(target_lib)
            if not os.path.exists(target_dir):
                os.makedirs(target_dir)

            self.copy_file(export_lib, target_lib)

    def build_extensions(self):
        self.create_compile_commands()
        # The caffe2 extensions are created in
        # tmp_install/lib/pythonM.m/site-packages/caffe2/python/
        # and need to be copied to build/lib.linux.... , which will be a
        # platform dependent build folder created by the "build" command of
        # setuptools. Only the contents of this folder are installed in the
        # "install" command by default.
        # We only make this copy for Caffe2's pybind extensions
        caffe2_pybind_exts = [
            'caffe2.python.caffe2_pybind11_state',
            'caffe2.python.caffe2_pybind11_state_gpu',
            'caffe2.python.caffe2_pybind11_state_hip',
        ]
        i = 0
        while i < len(self.extensions):
            ext = self.extensions[i]
            if ext.name not in caffe2_pybind_exts:
                i += 1
                continue
            fullname = self.get_ext_fullname(ext.name)
            filename = self.get_ext_filename(fullname)
            report("\nCopying extension {}".format(ext.name))

            relative_site_packages = sysconfig.get_path('purelib').replace(sysconfig.get_path('data'), '').lstrip(os.path.sep)
            src = os.path.join("torch", relative_site_packages, filename)
            if not os.path.exists(src):
                report("{} does not exist".format(src))
                del self.extensions[i]
            else:
                dst = os.path.join(os.path.realpath(self.build_lib), filename)
                report("Copying {} from {} to {}".format(ext.name, src, dst))
                dst_dir = os.path.dirname(dst)
                if not os.path.exists(dst_dir):
                    os.makedirs(dst_dir)
                self.copy_file(src, dst)
                i += 1
        setuptools.command.build_ext.build_ext.build_extensions(self)


    def get_outputs(self):
        outputs = setuptools.command.build_ext.build_ext.get_outputs(self)
        outputs.append(os.path.join(self.build_lib, "caffe2"))
        report("setup.py::get_outputs returning {}".format(outputs))
        return outputs

    def create_compile_commands(self):
        def load(filename):
            with open(filename) as f:
                return json.load(f)
        ninja_files = glob.glob('build/*compile_commands.json')
        cmake_files = glob.glob('torch/lib/build/*/compile_commands.json')
        all_commands = [entry
                        for f in ninja_files + cmake_files
                        for entry in load(f)]

        # cquery does not like c++ compiles that start with gcc.
        # It forgets to include the c++ header directories.
        # We can work around this by replacing the gcc calls that python
        # setup.py generates with g++ calls instead
        for command in all_commands:
            if command['command'].startswith("gcc "):
                command['command'] = "g++ " + command['command'][4:]

        new_contents = json.dumps(all_commands, indent=2)
        contents = ''
        if os.path.exists('compile_commands.json'):
            with open('compile_commands.json', 'r') as f:
                contents = f.read()
        if contents != new_contents:
            with open('compile_commands.json', 'w') as f:
                f.write(new_contents)

class concat_license_files():
    """Merge LICENSE and LICENSES_BUNDLED.txt as a context manager

    LICENSE is the main PyTorch license, LICENSES_BUNDLED.txt is auto-generated
    from all the licenses found in ./third_party/. We concatenate them so there
    is a single license file in the sdist and wheels with all of the necessary
    licensing info.
    """
    def __init__(self):
        self.f1 = 'LICENSE'
        self.f2 = 'third_party/LICENSES_BUNDLED.txt'

    def __enter__(self):
        """Concatenate files"""
        with open(self.f1, 'r') as f1:
            self.bsd_text = f1.read()

        with open(self.f1, 'a') as f1:
            with open(self.f2, 'r') as f2:
                self.bundled_text = f2.read()
                f1.write('\n\n')
                f1.write(self.bundled_text)

    def __exit__(self, exception_type, exception_value, traceback):
        """Restore content of f1"""
        with open(self.f1, 'w') as f:
            f.write(self.bsd_text)


try:
    from wheel.bdist_wheel import bdist_wheel
except ImportError:
    # This is useful when wheel is not installed and bdist_wheel is not
    # specified on the command line. If it _is_ specified, parsing the command
    # line will fail before wheel_concatenate is needed
    wheel_concatenate = None
else:
    # Need to create the proper LICENSE.txt for the wheel
    class wheel_concatenate(bdist_wheel):
        """ check submodules on sdist to prevent incomplete tarballs """
        def run(self):
            with concat_license_files():
                super().run()


class install(setuptools.command.install.install):
    def run(self):
        super().run()


class clean(setuptools.Command):
    user_options = []

    def initialize_options(self):
        pass

    def finalize_options(self):
        pass

    def run(self):
        import glob
        import re
        with open('.gitignore', 'r') as f:
            ignores = f.read()
            pat = re.compile(r'^#( BEGIN NOT-CLEAN-FILES )?')
            for wildcard in filter(None, ignores.split('\n')):
                match = pat.match(wildcard)
                if match:
                    if match.group(1):
                        # Marker is found and stop reading .gitignore.
                        break
                    # Ignore lines which begin with '#'.
                else:
                    for filename in glob.glob(wildcard):
                        try:
                            os.remove(filename)
                        except OSError:
                            shutil.rmtree(filename, ignore_errors=True)


class sdist(setuptools.command.sdist.sdist):
    def run(self):
        with concat_license_files():
            super().run()


def configure_extension_build():
    r"""Configures extension build options according to system environment and user's choice.

    Returns:
      The input to parameters ext_modules, cmdclass, packages, and entry_points as required in setuptools.setup.
    """

    try:
        cmake_cache_vars = defaultdict(lambda: False, cmake.get_cmake_cache_variables())
    except FileNotFoundError:
        # CMakeCache.txt does not exist. Probably running "python setup.py clean" over a clean directory.
        cmake_cache_vars = defaultdict(lambda: False)

    ################################################################################
    # Configure compile flags
    ################################################################################

    library_dirs = []
    extra_install_requires = []

    if IS_WINDOWS:
        # /NODEFAULTLIB makes sure we only link to DLL runtime
        # and matches the flags set for protobuf and ONNX
        extra_link_args = ['/NODEFAULTLIB:LIBCMT.LIB']
        # /MD links against DLL runtime
        # and matches the flags set for protobuf and ONNX
        # /EHsc is about standard C++ exception handling
        # /DNOMINMAX removes builtin min/max functions
        # /wdXXXX disables warning no. XXXX
        extra_compile_args = ['/MD', '/EHsc', '/DNOMINMAX',
                              '/wd4267', '/wd4251', '/wd4522', '/wd4522', '/wd4838',
                              '/wd4305', '/wd4244', '/wd4190', '/wd4101', '/wd4996',
                              '/wd4275']
    else:
        extra_link_args = []
        extra_compile_args = [
            '-Wall',
            '-Wextra',
            '-Wno-strict-overflow',
            '-Wno-unused-parameter',
            '-Wno-missing-field-initializers',
            '-Wno-write-strings',
            '-Wno-unknown-pragmas',
            # This is required for Python 2 declarations that are deprecated in 3.
            '-Wno-deprecated-declarations',
            # Python 2.6 requires -fno-strict-aliasing, see
            # http://legacy.python.org/dev/peps/pep-3123/
            # We also depend on it in our code (even Python 3).
            '-fno-strict-aliasing',
            # Clang has an unfixed bug leading to spurious missing
            # braces warnings, see
            # https://bugs.llvm.org/show_bug.cgi?id=21629
            '-Wno-missing-braces',
        ]

    library_dirs.append(lib_path)

    main_compile_args = []
    main_libraries = ['torch_python']
    main_link_args = []
    main_sources = ["torch/csrc/stub.c"]

    if cmake_cache_vars['USE_CUDA']:
        library_dirs.append(
            os.path.dirname(cmake_cache_vars['CUDA_CUDA_LIB']))

    if build_type.is_debug():
        if IS_WINDOWS:
            extra_compile_args.append('/Z7')
            extra_link_args.append('/DEBUG:FULL')
        else:
            extra_compile_args += ['-O0', '-g']
            extra_link_args += ['-O0', '-g']

    if build_type.is_rel_with_deb_info():
        if IS_WINDOWS:
            extra_compile_args.append('/Z7')
            extra_link_args.append('/DEBUG:FULL')
        else:
            extra_compile_args += ['-g']
            extra_link_args += ['-g']

    # Cross-compile for M1
    if IS_DARWIN:
        macos_target_arch = os.getenv('CMAKE_OSX_ARCHITECTURES', '')
        if macos_target_arch in ['arm64', 'x86_64']:
            macos_sysroot_path = os.getenv('CMAKE_OSX_SYSROOT')
            if macos_sysroot_path is None:
                macos_sysroot_path = subprocess.check_output([
                    'xcrun', '--show-sdk-path', '--sdk', 'macosx'
                ]).decode('utf-8').strip()
            extra_compile_args += ['-arch', macos_target_arch, '-isysroot', macos_sysroot_path]
            extra_link_args += ['-arch', macos_target_arch]


    def make_relative_rpath_args(path):
        if IS_DARWIN:
            return ['-Wl,-rpath,@loader_path/' + path]
        elif IS_WINDOWS:
            return []
        else:
            return ['-Wl,-rpath,$ORIGIN/' + path]

    ################################################################################
    # Declare extensions and package
    ################################################################################

    extensions = []
    packages = find_packages(exclude=('tools', 'tools.*'))
    C = Extension("torch._C",
                  libraries=main_libraries,
                  sources=main_sources,
                  language='c',
                  extra_compile_args=main_compile_args + extra_compile_args,
                  include_dirs=[],
                  library_dirs=library_dirs,
                  extra_link_args=extra_link_args + main_link_args + make_relative_rpath_args('lib'))
    extensions.append(C)

    if not IS_WINDOWS:
        DL = Extension("torch._dl",
                       sources=["torch/csrc/dl.c"],
                       language='c')
        extensions.append(DL)

    # These extensions are built by cmake and copied manually in build_extensions()
    # inside the build_ext implementation
    if cmake_cache_vars['BUILD_CAFFE2']:
        extensions.append(
            Extension(
                name=str('caffe2.python.caffe2_pybind11_state'),
                sources=[]),
        )
        if cmake_cache_vars['USE_CUDA']:
            extensions.append(
                Extension(
                    name=str('caffe2.python.caffe2_pybind11_state_gpu'),
                    sources=[]),
            )
        if cmake_cache_vars['USE_ROCM']:
            extensions.append(
                Extension(
                    name=str('caffe2.python.caffe2_pybind11_state_hip'),
                    sources=[]),
            )

    cmdclass = {
        'bdist_wheel': wheel_concatenate,
        'build_ext': build_ext,
        'clean': clean,
        'install': install,
        'sdist': sdist,
    }

    entry_points = {
        'console_scripts': [
            'convert-caffe2-to-onnx = caffe2.python.onnx.bin.conversion:caffe2_to_onnx',
            'convert-onnx-to-caffe2 = caffe2.python.onnx.bin.conversion:onnx_to_caffe2',
            'torchrun = torch.distributed.run:main',
        ]
    }

    return extensions, cmdclass, packages, entry_points, extra_install_requires

# post run, warnings, printed at the end to make them more visible
build_update_message = """
    It is no longer necessary to use the 'build' or 'rebuild' targets

    To install:
      $ python setup.py install
    To develop locally:
      $ python setup.py develop
    To force cmake to re-generate native build files (off by default):
      $ python setup.py develop --cmake
"""


def print_box(msg):
    lines = msg.split('\n')
    size = max(len(l) + 1 for l in lines)
    print('-' * (size + 2))
    for l in lines:
        print('|{}{}|'.format(l, ' ' * (size - len(l))))
    print('-' * (size + 2))

if __name__ == '__main__':
    # Parse the command line and check the arguments
    # before we proceed with building deps and setup
    dist = Distribution()
    try:
        dist.parse_command_line()
    except setuptools.distutils.errors.DistutilsArgError as e:
        print(e)
        sys.exit(1)

    if RUN_BUILD_DEPS:
        build_deps()

    extensions, cmdclass, packages, entry_points, extra_install_requires = configure_extension_build()

    install_requires += extra_install_requires

    # Read in README.md for our long_description
    with open(os.path.join(cwd, "README.md"), encoding="utf-8") as f:
        long_description = f.read()

    version_range_max = max(sys.version_info[1], 9) + 1
    setup(
        name=package_name,
        version=version,
        description=("Tensors and Dynamic neural networks in "
                     "Python with strong GPU acceleration"),
        long_description=long_description,
        long_description_content_type="text/markdown",
        ext_modules=extensions,
        cmdclass=cmdclass,
        packages=packages,
        entry_points=entry_points,
        install_requires=install_requires,
        package_data={
            'torch': [
                'py.typed',
                'bin/*',
                'test/*',
                '_C/*.pyi',
                'cuda/*.pyi',
                'optim/*.pyi',
                'autograd/*.pyi',
                'utils/data/*.pyi',
                'nn/*.pyi',
                'nn/modules/*.pyi',
                'nn/parallel/*.pyi',
                'lib/*.so*',
                'lib/*.dylib*',
                'lib/*.dll',
                'lib/*.lib',
                'lib/*.pdb',
                'lib/torch_shm_manager',
                'lib/*.h',
                'include/ATen/*.h',
                'include/ATen/cpu/*.h',
                'include/ATen/cpu/vec/vec256/*.h',
                'include/ATen/cpu/vec/vec512/*.h',
                'include/ATen/cpu/vec/*.h',
                'include/ATen/core/*.h',
                'include/ATen/cuda/*.cuh',
                'include/ATen/cuda/*.h',
                'include/ATen/cuda/detail/*.cuh',
                'include/ATen/cuda/detail/*.h',
                'include/ATen/cudnn/*.h',
                'include/ATen/hip/*.cuh',
                'include/ATen/hip/*.h',
                'include/ATen/hip/detail/*.cuh',
                'include/ATen/hip/detail/*.h',
                'include/ATen/hip/impl/*.h',
                'include/ATen/detail/*.h',
                'include/ATen/native/*.h',
                'include/ATen/native/cpu/*.h',
                'include/ATen/native/cuda/*.h',
                'include/ATen/native/cuda/*.cuh',
                'include/ATen/native/hip/*.h',
                'include/ATen/native/hip/*.cuh',
                'include/ATen/native/quantized/*.h',
                'include/ATen/native/quantized/cpu/*.h',
                'include/ATen/quantized/*.h',
                'include/caffe2/utils/*.h',
                'include/caffe2/utils/**/*.h',
                'include/c10/*.h',
                'include/c10/macros/*.h',
                'include/c10/core/*.h',
                'include/ATen/core/boxing/*.h',
                'include/ATen/core/boxing/impl/*.h',
                'include/ATen/core/dispatch/*.h',
                'include/ATen/core/op_registration/*.h',
                'include/c10/core/impl/*.h',
                'include/c10/util/*.h',
                'include/c10/cuda/*.h',
                'include/c10/cuda/impl/*.h',
                'include/c10/hip/*.h',
                'include/c10/hip/impl/*.h',
                'include/c10d/*.hpp',
                'include/caffe2/**/*.h',
                'include/torch/*.h',
                'include/torch/csrc/*.h',
                'include/torch/csrc/api/include/torch/*.h',
                'include/torch/csrc/api/include/torch/data/*.h',
                'include/torch/csrc/api/include/torch/data/dataloader/*.h',
                'include/torch/csrc/api/include/torch/data/datasets/*.h',
                'include/torch/csrc/api/include/torch/data/detail/*.h',
                'include/torch/csrc/api/include/torch/data/samplers/*.h',
                'include/torch/csrc/api/include/torch/data/transforms/*.h',
                'include/torch/csrc/api/include/torch/detail/*.h',
                'include/torch/csrc/api/include/torch/detail/ordered_dict.h',
                'include/torch/csrc/api/include/torch/nn/*.h',
                'include/torch/csrc/api/include/torch/nn/functional/*.h',
                'include/torch/csrc/api/include/torch/nn/options/*.h',
                'include/torch/csrc/api/include/torch/nn/modules/*.h',
                'include/torch/csrc/api/include/torch/nn/modules/container/*.h',
                'include/torch/csrc/api/include/torch/nn/parallel/*.h',
                'include/torch/csrc/api/include/torch/nn/utils/*.h',
                'include/torch/csrc/api/include/torch/optim/*.h',
                'include/torch/csrc/api/include/torch/optim/schedulers/*.h',
                'include/torch/csrc/api/include/torch/serialize/*.h',
                'include/torch/csrc/autograd/*.h',
                'include/torch/csrc/autograd/functions/*.h',
                'include/torch/csrc/autograd/generated/*.h',
                'include/torch/csrc/autograd/utils/*.h',
                'include/torch/csrc/cuda/*.h',
                'include/torch/csrc/jit/*.h',
                'include/torch/csrc/jit/backends/*.h',
                'include/torch/csrc/jit/generated/*.h',
                'include/torch/csrc/jit/passes/*.h',
                'include/torch/csrc/jit/passes/quantization/*.h',
                'include/torch/csrc/jit/passes/utils/*.h',
                'include/torch/csrc/jit/runtime/*.h',
                'include/torch/csrc/jit/ir/*.h',
                'include/torch/csrc/jit/frontend/*.h',
                'include/torch/csrc/jit/api/*.h',
                'include/torch/csrc/jit/serialization/*.h',
                'include/torch/csrc/jit/python/*.h',
                'include/torch/csrc/jit/testing/*.h',
                'include/torch/csrc/jit/tensorexpr/*.h',
                'include/torch/csrc/jit/tensorexpr/operators/*.h',
                'include/torch/csrc/onnx/*.h',
                'include/torch/csrc/utils/*.h',
                'include/torch/csrc/tensor/*.h',
                'include/pybind11/*.h',
                'include/pybind11/detail/*.h',
                'include/TH/*.h*',
                'include/TH/generic/*.h*',
                'include/THC/*.cuh',
                'include/THC/*.h*',
                'include/THC/generic/*.h',
                'include/THH/*.cuh',
                'include/THH/*.h*',
                'include/THH/generic/*.h',
                'share/cmake/ATen/*.cmake',
                'share/cmake/Caffe2/*.cmake',
                'share/cmake/Caffe2/public/*.cmake',
                'share/cmake/Caffe2/Modules_CUDA_fix/*.cmake',
                'share/cmake/Caffe2/Modules_CUDA_fix/upstream/*.cmake',
                'share/cmake/Caffe2/Modules_CUDA_fix/upstream/FindCUDA/*.cmake',
                'share/cmake/Gloo/*.cmake',
                'share/cmake/Tensorpipe/*.cmake',
                'share/cmake/Torch/*.cmake',
                'utils/benchmark/utils/*.cpp',
                'utils/benchmark/utils/valgrind_wrapper/*.cpp',
                'utils/benchmark/utils/valgrind_wrapper/*.h',
                'utils/model_dump/skeleton.html',
                'utils/model_dump/code.js',
                'utils/model_dump/*.mjs',
            ],
            'caffe2': [
                'python/serialized_test/data/operator_test/*.zip',
            ],
        },
        url='https://pytorch.org/',
        download_url='https://github.com/pytorch/pytorch/tags',
        author='PyTorch Team',
        author_email='packages@pytorch.org',
        python_requires='>={}'.format(python_min_version_str),
        # PyPI package information.
        classifiers=[
            'Development Status :: 5 - Production/Stable',
            'Intended Audience :: Developers',
            'Intended Audience :: Education',
            'Intended Audience :: Science/Research',
            'License :: OSI Approved :: BSD License',
            'Topic :: Scientific/Engineering',
            'Topic :: Scientific/Engineering :: Mathematics',
            'Topic :: Scientific/Engineering :: Artificial Intelligence',
            'Topic :: Software Development',
            'Topic :: Software Development :: Libraries',
            'Topic :: Software Development :: Libraries :: Python Modules',
            'Programming Language :: C++',
            'Programming Language :: Python :: 3',
        ] + ['Programming Language :: Python :: 3.{}'.format(i) for i in range(python_min_version[1], version_range_max)],
        license='BSD-3',
        keywords='pytorch machine learning',
    )
    if EMIT_BUILD_WARNING:
        print_box(build_update_message)