text: #!/usr/bin/env python
  # Copyright The PyTorch Lightning team.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import os
  from importlib.util import module_from_spec, spec_from_file_location
  
  from pkg_resources import parse_requirements
  from setuptools import find_packages, setup
  
  # https://packaging.python.org/guides/single-sourcing-package-version/
  # http://blog.ionelmc.ro/2014/05/25/python-packaging/
  _PATH_ROOT = os.path.dirname(__file__)
  _PATH_REQUIRE = os.path.join(_PATH_ROOT, "requirements")
  
  
  def _load_py_module(fname, pkg="pytorch_lightning"):
      spec = spec_from_file_location(os.path.join(pkg, fname), os.path.join(_PATH_ROOT, pkg, fname))
      py = module_from_spec(spec)
      spec.loader.exec_module(py)
      return py
  
  
  about = _load_py_module("__about__.py")
  setup_tools = _load_py_module("setup_tools.py")
  
  # https://setuptools.readthedocs.io/en/latest/setuptools.html#declaring-extras
  # Define package extras. These are only installed if you specify them.
  # From remote, use like `pip install pytorch-lightning[dev, docs]`
  # From local copy of repo, use like `pip install ".[dev, docs]"`
  extras = {
      # 'docs': load_requirements(file_name='docs.txt'),
      "examples": setup_tools._load_requirements(path_dir=_PATH_REQUIRE, file_name="examples.txt"),
      "loggers": setup_tools._load_requirements(path_dir=_PATH_REQUIRE, file_name="loggers.txt"),
      "extra": setup_tools._load_requirements(path_dir=_PATH_REQUIRE, file_name="extra.txt"),
      "strategies": setup_tools._load_requirements(path_dir=_PATH_REQUIRE, file_name="strategies.txt"),
      "test": setup_tools._load_requirements(path_dir=_PATH_REQUIRE, file_name="test.txt"),
  }
  
  for req in parse_requirements(extras["strategies"]):
      extras[req.key] = [str(req)]
  extras["dev"] = extras["extra"] + extras["loggers"] + extras["test"]
  extras["all"] = extras["dev"] + extras["examples"] + extras["strategies"]  # + extras['docs']
  
  long_description = setup_tools._load_readme_description(
      _PATH_ROOT, homepage=about.__homepage__, version=about.__version__
  )
  
  # https://packaging.python.org/discussions/install-requires-vs-requirements /
  # keep the meta-data here for simplicity in reading this file... it's not obvious
  # what happens and to non-engineers they won't know to look in init ...
  # the goal of the project is simplicity for researchers, don't want to add too much
  # engineer specific practices
  setup(
      name="pytorch-lightning",
      version=about.__version__,
      description=about.__docs__,
      author=about.__author__,
      author_email=about.__author_email__,
      url=about.__homepage__,
      download_url="https://github.com/PyTorchLightning/pytorch-lightning",
      license=about.__license__,
      packages=find_packages(exclude=["tests*", "pl_examples*", "legacy*"]),
      include_package_data=True,
      long_description=long_description,
      long_description_content_type="text/markdown",
      zip_safe=False,
      keywords=["deep learning", "pytorch", "AI"],
      python_requires=">=3.7",
      setup_requires=[],
      install_requires=setup_tools._load_requirements(_PATH_REQUIRE),
      extras_require=extras,
      project_urls={
          "Bug Tracker": "https://github.com/PyTorchLightning/pytorch-lightning/issues",
          "Documentation": "https://pytorch-lightning.rtfd.io/en/latest/",
          "Source Code": "https://github.com/PyTorchLightning/pytorch-lightning",
      },
      classifiers=[
          "Environment :: Console",
          "Natural Language :: English",
          "Development Status :: 5 - Production/Stable",
          # Indicate who your project is intended for
          "Intended Audience :: Developers",
          "Topic :: Scientific/Engineering :: Artificial Intelligence",
          "Topic :: Scientific/Engineering :: Image Recognition",
          "Topic :: Scientific/Engineering :: Information Analysis",
          # Pick your license as you wish
          "License :: OSI Approved :: Apache Software License",
          "Operating System :: OS Independent",
          # Specify the Python versions you support here.
          "Programming Language :: Python :: 3",
          "Programming Language :: Python :: 3.7",
          "Programming Language :: Python :: 3.8",
          "Programming Language :: Python :: 3.9",
      ],
  )
  