In many demos released by TensorFlow, there is such code, as follows, what is this for?
- if __name__ == "__main__":
- tf.app.run()
Let's take a look at the source code:
- # tensorflow/tensorflow/python/platform/default/_app.py
- # Copyright 2015 Google Inc. All Rights Reserved.
- #
- # 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.
- # ==============================================================================
- """Generic entry point script."""
- from __future__ import absolute_import
- from __future__ import division
- from __future__ import print_function
- import sys
- from tensorflow.python.platform import flags
- def run(main=None):
- f = flags.FLAGS
- f._parse_flags()
- main = main or sys.modules['__main__'].main
- sys.exit(main(sys.argv))
Process flag parsing, and then execute the main function, so what does flag parsing mean? Something like this:
- tf.app.flags.DEFINE_boolean("self_test", False, "True if running a self test.")
- tf.app.flags.DEFINE_boolean('use_fp16', False,
- "Use half floats instead of full floats if True.")
- FLAGS = tf.app.flags.FLAGS