text: #!/usr/bin/env python
  import os
  import subprocess
  import time
  from setuptools import find_packages, setup
  
  import torch
  from torch.utils.cpp_extension import (BuildExtension, CppExtension,
                                         CUDAExtension)
  
  
  def readme():
      with open('README.md', encoding='utf-8') as f:
          content = f.read()
      return content
  
  
  version_file = 'mmdet/version.py'
  
  
  def get_git_hash():
  
      def _minimal_ext_cmd(cmd):
          # construct minimal environment
          env = {}
          for k in ['SYSTEMROOT', 'PATH', 'HOME']:
              v = os.environ.get(k)
              if v is not None:
                  env[k] = v
          # LANGUAGE is used on win32
          env['LANGUAGE'] = 'C'
          env['LANG'] = 'C'
          env['LC_ALL'] = 'C'
          out = subprocess.Popen(
              cmd, stdout=subprocess.PIPE, env=env).communicate()[0]
          return out
  
      try:
          out = _minimal_ext_cmd(['git', 'rev-parse', 'HEAD'])
          sha = out.strip().decode('ascii')
      except OSError:
          sha = 'unknown'
  
      return sha
  
  
  def get_hash():
      if os.path.exists('.git'):
          sha = get_git_hash()[:7]
      elif os.path.exists(version_file):
          try:
              from mmdet.version import __version__
              sha = __version__.split('+')[-1]
          except ImportError:
              raise ImportError('Unable to get git version')
      else:
          sha = 'unknown'
  
      return sha
  
  
  def write_version_py():
      content = """# GENERATED VERSION FILE
  # TIME: {}
  
  __version__ = '{}'
  short_version = '{}'
  version_info = ({})
  """
      sha = get_hash()
      with open('mmdet/VERSION', 'r') as f:
          SHORT_VERSION = f.read().strip()
      VERSION_INFO = ', '.join(SHORT_VERSION.split('.'))
      VERSION = SHORT_VERSION + '+' + sha
  
      version_file_str = content.format(time.asctime(), VERSION, SHORT_VERSION,
                                        VERSION_INFO)
      with open(version_file, 'w') as f:
          f.write(version_file_str)
  
  
  def get_version():
      with open(version_file, 'r') as f:
          exec(compile(f.read(), version_file, 'exec'))
      return locals()['__version__']
  
  
  def make_cuda_ext(name, module, sources, sources_cuda=[]):
  
      define_macros = []
      extra_compile_args = {'cxx': []}
  
      if torch.cuda.is_available() or os.getenv('FORCE_CUDA', '0') == '1':
          define_macros += [('WITH_CUDA', None)]
          extension = CUDAExtension
          extra_compile_args['nvcc'] = [
              '-D__CUDA_NO_HALF_OPERATORS__',
              '-D__CUDA_NO_HALF_CONVERSIONS__',
              '-D__CUDA_NO_HALF2_OPERATORS__',
          ]
          sources += sources_cuda
      else:
          print(f'Compiling {name} without CUDA')
          extension = CppExtension
          # raise EnvironmentError('CUDA is required to compile MMDetection!')
  
      return extension(
          name=f'{module}.{name}',
          sources=[os.path.join(*module.split('.'), p) for p in sources],
          define_macros=define_macros,
          extra_compile_args=extra_compile_args)
  
  
  def parse_requirements(fname='requirements.txt', with_version=True):
      """
      Parse the package dependencies listed in a requirements file but strips
      specific versioning information.
  
      Args:
          fname (str): path to requirements file
          with_version (bool, default=False): if True include version specs
  
      Returns:
          List[str]: list of requirements items
  
      CommandLine:
          python -c "import setup; print(setup.parse_requirements())"
      """
      import sys
      from os.path import exists
      import re
      require_fpath = fname
  
      def parse_line(line):
          """
          Parse information from a line in a requirements text file
          """
          if line.startswith('-r '):
              # Allow specifying requirements in other files
              target = line.split(' ')[1]
              for info in parse_require_file(target):
                  yield info
          else:
              info = {'line': line}
              if line.startswith('-e '):
                  info['package'] = line.split('#egg=')[1]
              else:
                  # Remove versioning from the package
                  pat = '(' + '|'.join(['>=', '==', '>']) + ')'
                  parts = re.split(pat, line, maxsplit=1)
                  parts = [p.strip() for p in parts]
  
                  info['package'] = parts[0]
                  if len(parts) > 1:
                      op, rest = parts[1:]
                      if ';' in rest:
                          # Handle platform specific dependencies
                          # http://setuptools.readthedocs.io/en/latest/setuptools.html#declaring-platform-specific-dependencies
                          version, platform_deps = map(str.strip,
                                                       rest.split(';'))
                          info['platform_deps'] = platform_deps
                      else:
                          version = rest  # NOQA
                      info['version'] = (op, version)
              yield info
  
      def parse_require_file(fpath):
          with open(fpath, 'r') as f:
              for line in f.readlines():
                  line = line.strip()
                  if line and not line.startswith('#'):
                      for info in parse_line(line):
                          yield info
  
      def gen_packages_items():
          if exists(require_fpath):
              for info in parse_require_file(require_fpath):
                  parts = [info['package']]
                  if with_version and 'version' in info:
                      parts.extend(info['version'])
                  if not sys.version.startswith('3.4'):
                      # apparently package_deps are broken in 3.4
                      platform_deps = info.get('platform_deps')
                      if platform_deps is not None:
                          parts.append(';' + platform_deps)
                  item = ''.join(parts)
                  yield item
  
      packages = list(gen_packages_items())
      return packages
  
  
  if __name__ == '__main__':
      write_version_py()
      setup(
          name='mmdet',
          version=get_version(),
          description='Open MMLab Detection Toolbox and Benchmark',
          long_description=readme(),
          author='OpenMMLab',
          author_email='chenkaidev@gmail.com',
          keywords='computer vision, object detection',
          url='https://github.com/open-mmlab/mmdetection',
          packages=find_packages(exclude=('configs', 'tools', 'demo')),
          package_data={'mmdet.ops': ['*/*.so']},
          classifiers=[
              'Development Status :: 4 - Beta',
              'License :: OSI Approved :: Apache Software License',
              'Operating System :: OS Independent',
              'Programming Language :: Python :: 3',
              'Programming Language :: Python :: 3.5',
              'Programming Language :: Python :: 3.6',
              'Programming Language :: Python :: 3.7',
          ],
          license='Apache License 2.0',
          setup_requires=parse_requirements('requirements/build.txt'),
          tests_require=parse_requirements('requirements/tests.txt'),
          install_requires=parse_requirements('requirements/runtime.txt'),
          extras_require={
              'all': parse_requirements('requirements.txt'),
              'tests': parse_requirements('requirements/tests.txt'),
              'build': parse_requirements('requirements/build.txt'),
              'optional': parse_requirements('requirements/optional.txt'),
          },
          ext_modules=[
              make_cuda_ext(
                  name='compiling_info',
                  module='mmdet.ops.utils',
                  sources=['src/compiling_info.cpp']),
              make_cuda_ext(
                  name='nms_ext',
                  module='mmdet.ops.nms',
                  sources=['src/nms_ext.cpp', 'src/cpu/nms_cpu.cpp'],
                  sources_cuda=[
                      'src/cuda/nms_cuda.cpp', 'src/cuda/nms_kernel.cu'
                  ]),
              make_cuda_ext(
                  name='roi_align_ext',
                  module='mmdet.ops.roi_align',
                  sources=[
                      'src/roi_align_ext.cpp',
                      'src/cpu/roi_align_v2.cpp',
                  ],
                  sources_cuda=[
                      'src/cuda/roi_align_kernel.cu',
                      'src/cuda/roi_align_kernel_v2.cu'
                  ]),
              make_cuda_ext(
                  name='roi_pool_ext',
                  module='mmdet.ops.roi_pool',
                  sources=['src/roi_pool_ext.cpp'],
                  sources_cuda=['src/cuda/roi_pool_kernel.cu']),
              make_cuda_ext(
                  name='deform_conv_ext',
                  module='mmdet.ops.dcn',
                  sources=['src/deform_conv_ext.cpp'],
                  sources_cuda=[
                      'src/cuda/deform_conv_cuda.cpp',
                      'src/cuda/deform_conv_cuda_kernel.cu'
                  ]),
              make_cuda_ext(
                  name='deform_pool_ext',
                  module='mmdet.ops.dcn',
                  sources=['src/deform_pool_ext.cpp'],
                  sources_cuda=[
                      'src/cuda/deform_pool_cuda.cpp',
                      'src/cuda/deform_pool_cuda_kernel.cu'
                  ]),
              make_cuda_ext(
                  name='sigmoid_focal_loss_ext',
                  module='mmdet.ops.sigmoid_focal_loss',
                  sources=['src/sigmoid_focal_loss_ext.cpp'],
                  sources_cuda=['src/cuda/sigmoid_focal_loss_cuda.cu']),
              make_cuda_ext(
                  name='masked_conv2d_ext',
                  module='mmdet.ops.masked_conv',
                  sources=['src/masked_conv2d_ext.cpp'],
                  sources_cuda=[
                      'src/cuda/masked_conv2d_cuda.cpp',
                      'src/cuda/masked_conv2d_kernel.cu'
                  ]),
              make_cuda_ext(
                  name='carafe_ext',
                  module='mmdet.ops.carafe',
                  sources=['src/carafe_ext.cpp'],
                  sources_cuda=[
                      'src/cuda/carafe_cuda.cpp',
                      'src/cuda/carafe_cuda_kernel.cu'
                  ]),
              make_cuda_ext(
                  name='carafe_naive_ext',
                  module='mmdet.ops.carafe',
                  sources=['src/carafe_naive_ext.cpp'],
                  sources_cuda=[
                      'src/cuda/carafe_naive_cuda.cpp',
                      'src/cuda/carafe_naive_cuda_kernel.cu'
                  ]),
              make_cuda_ext(
                  name='corner_pool_ext',
                  module='mmdet.ops.corner_pool',
                  sources=['src/corner_pool.cpp']),
          ],
          cmdclass={'build_ext': BuildExtension},
          zip_safe=False)
  