new_contents: # coding=utf-8
  # Copyright 2018 The TF-Agents Authors.
  #
  # 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.
  
  r"""Generate docs for TF-Agents.
  
  # How to run
  
  ```
  python build_docs.py --output_dir=/path/to/output
  ```
  
  """
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  import os
  import sys
  
  from absl import app
  from absl import flags
  
  from tensorflow_docs.api_generator import generate_lib
  from tensorflow_docs.api_generator import public_api
  
  import tf_agents
  # pylint: disable=unused-import
  from tf_agents import agents
  from tf_agents import distributions
  from tf_agents import drivers
  from tf_agents import environments
  from tf_agents import metrics
  from tf_agents import networks
  from tf_agents import policies
  from tf_agents import replay_buffers
  from tf_agents import specs
  from tf_agents import trajectories
  from tf_agents import utils
  # pylint: enable=unused-import
  
  flags.DEFINE_string('output_dir', '/tmp/agents_api/',
                      'The path to output the files to')
  
  flags.DEFINE_string('code_url_prefix',
                      'https://github.com/tensorflow/agents/blob/master/',
                      'The url prefix for links to code.')
  
  flags.DEFINE_bool('search_hints', True,
                    'Include metadata search hints in the generated files')
  
  flags.DEFINE_string('site_path', 'agents/api_docs/python',
                      'Path prefix in the _toc.yaml')
  
  FLAGS = flags.FLAGS
  
  
  def main(_):
    doc_generator = generate_lib.DocGenerator(
        root_title='TF-Agents',
        py_modules=[('tf_agents', tf_agents)],
        base_dir=os.path.dirname(tf_agents.__file__),
        code_url_prefix=FLAGS.code_url_prefix,
        search_hints=FLAGS.search_hints,
        site_path=FLAGS.site_path,
        private_map={},
        callbacks=[public_api.local_definitions_filter])
  
    sys.exit(doc_generator.build(output_dir=FLAGS.output_dir))
  
  
  if __name__ == '__main__':
    app.run(main)
  
subject: add build_docs script