# Copyright 2017 The TensorFlow Authors. 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.
# ==============================================================================

"""Tests for object_detection.utils.variables_helper."""
import os

import tensorflow as tf

from object_detection.utils import variables_helper


class FilterVariablesTest(tf.test.TestCase):

  def _create_variables(self):
    return [tf.Variable(1.0, name='FeatureExtractor/InceptionV3/weights'),
            tf.Variable(1.0, name='FeatureExtractor/InceptionV3/biases'),
            tf.Variable(1.0, name='StackProposalGenerator/weights'),
            tf.Variable(1.0, name='StackProposalGenerator/biases')]

  def test_return_all_variables_when_empty_regex(self):
    variables = self._create_variables()
    out_variables = variables_helper.filter_variables(variables, [''])
    self.assertItemsEqual(out_variables, variables)

  def test_return_variables_which_do_not_match_single_regex(self):
    variables = self._create_variables()
    out_variables = variables_helper.filter_variables(variables,
                                                      ['FeatureExtractor/.*'])
    self.assertItemsEqual(out_variables, variables[2:])

  def test_return_variables_which_do_not_match_any_regex_in_list(self):
    variables = self._create_variables()
    out_variables = variables_helper.filter_variables(variables, [
        'FeatureExtractor.*biases', 'StackProposalGenerator.*biases'
    ])
    self.assertItemsEqual(out_variables, [variables[0], variables[2]])

  def test_return_variables_matching_empty_regex_list(self):
    variables = self._create_variables()
    out_variables = variables_helper.filter_variables(
        variables, [''], invert=True)
    self.assertItemsEqual(out_variables, [])

  def test_return_variables_matching_some_regex_in_list(self):
    variables = self._create_variables()
    out_variables = variables_helper.filter_variables(
        variables,
        ['FeatureExtractor.*biases', 'StackProposalGenerator.*biases'],
        invert=True)
    self.assertItemsEqual(out_variables, [variables[1], variables[3]])


class MultiplyGradientsMatchingRegexTest(tf.test.TestCase):

  def _create_grads_and_vars(self):
    return [(tf.constant(1.0),
             tf.Variable(1.0, name='FeatureExtractor/InceptionV3/weights')),
            (tf.constant(2.0),
             tf.Variable(2.0, name='FeatureExtractor/InceptionV3/biases')),
            (tf.constant(3.0),
             tf.Variable(3.0, name='StackProposalGenerator/weights')),
            (tf.constant(4.0),
             tf.Variable(4.0, name='StackProposalGenerator/biases'))]

  def test_multiply_all_feature_extractor_variables(self):
    grads_and_vars = self._create_grads_and_vars()
    regex_list = ['FeatureExtractor/.*']
    multiplier = 0.0
    grads_and_vars = variables_helper.multiply_gradients_matching_regex(
        grads_and_vars, regex_list, multiplier)
    exp_output = [(0.0, 1.0), (0.0, 2.0), (3.0, 3.0), (4.0, 4.0)]
    init_op = tf.global_variables_initializer()
    with self.test_session() as sess:
      sess.run(init_op)
      output = sess.run(grads_and_vars)
      self.assertItemsEqual(output, exp_output)

  def test_multiply_all_bias_variables(self):
    grads_and_vars = self._create_grads_and_vars()
    regex_list = ['.*/biases']
    multiplier = 0.0
    grads_and_vars = variables_helper.multiply_gradients_matching_regex(
        grads_and_vars, regex_list, multiplier)
    exp_output = [(1.0, 1.0), (0.0, 2.0), (3.0, 3.0), (0.0, 4.0)]
    init_op = tf.global_variables_initializer()
    with self.test_session() as sess:
      sess.run(init_op)
      output = sess.run(grads_and_vars)
      self.assertItemsEqual(output, exp_output)


class FreezeGradientsMatchingRegexTest(tf.test.TestCase):

  def _create_grads_and_vars(self):
    return [(tf.constant(1.0),
             tf.Variable(1.0, name='FeatureExtractor/InceptionV3/weights')),
            (tf.constant(2.0),
             tf.Variable(2.0, name='FeatureExtractor/InceptionV3/biases')),
            (tf.constant(3.0),
             tf.Variable(3.0, name='StackProposalGenerator/weights')),
            (tf.constant(4.0),
             tf.Variable(4.0, name='StackProposalGenerator/biases'))]

  def test_freeze_all_feature_extractor_variables(self):
    grads_and_vars = self._create_grads_and_vars()
    regex_list = ['FeatureExtractor/.*']
    grads_and_vars = variables_helper.freeze_gradients_matching_regex(
        grads_and_vars, regex_list)
    exp_output = [(3.0, 3.0), (4.0, 4.0)]
    init_op = tf.global_variables_initializer()
    with self.test_session() as sess:
      sess.run(init_op)
      output = sess.run(grads_and_vars)
      self.assertItemsEqual(output, exp_output)


class GetVariablesAvailableInCheckpointTest(tf.test.TestCase):

  def test_return_all_variables_from_checkpoint(self):
    variables = [
        tf.Variable(1.0, name='weights'),
        tf.Variable(1.0, name='biases')
    ]
    checkpoint_path = os.path.join(self.get_temp_dir(), 'graph.pb')
    init_op = tf.global_variables_initializer()
    saver = tf.train.Saver(variables)
    with self.test_session() as sess:
      sess.run(init_op)
      saver.save(sess, checkpoint_path)
    out_variables = variables_helper.get_variables_available_in_checkpoint(
        variables, checkpoint_path)
    self.assertItemsEqual(out_variables, variables)

  def test_return_variables_available_in_checkpoint(self):
    checkpoint_path = os.path.join(self.get_temp_dir(), 'graph.pb')
    graph1_variables = [
        tf.Variable(1.0, name='weights'),
    ]
    init_op = tf.global_variables_initializer()
    saver = tf.train.Saver(graph1_variables)
    with self.test_session() as sess:
      sess.run(init_op)
      saver.save(sess, checkpoint_path)

    graph2_variables = graph1_variables + [tf.Variable(1.0, name='biases')]
    out_variables = variables_helper.get_variables_available_in_checkpoint(
        graph2_variables, checkpoint_path)
    self.assertItemsEqual(out_variables, graph1_variables)

  def test_return_variables_available_an_checkpoint_with_dict_inputs(self):
    checkpoint_path = os.path.join(self.get_temp_dir(), 'graph.pb')
    graph1_variables = [
        tf.Variable(1.0, name='ckpt_weights'),
    ]
    init_op = tf.global_variables_initializer()
    saver = tf.train.Saver(graph1_variables)
    with self.test_session() as sess:
      sess.run(init_op)
      saver.save(sess, checkpoint_path)

    graph2_variables_dict = {
        'ckpt_weights': tf.Variable(1.0, name='weights'),
        'ckpt_biases': tf.Variable(1.0, name='biases')
    }
    out_variables = variables_helper.get_variables_available_in_checkpoint(
        graph2_variables_dict, checkpoint_path)
    self.assertTrue(isinstance(out_variables, dict))
    self.assertItemsEqual(out_variables.keys(), ['ckpt_weights'])
    self.assertTrue(out_variables['ckpt_weights'].op.name == 'weights')


if __name__ == '__main__':
  tf.test.main()
