# 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 models.faster_rcnn_pnas_feature_extractor."""

import tensorflow as tf

from object_detection.models import faster_rcnn_pnas_feature_extractor as frcnn_pnas


class FasterRcnnPNASFeatureExtractorTest(tf.test.TestCase):

  def _build_feature_extractor(self, first_stage_features_stride):
    return frcnn_pnas.FasterRCNNPNASFeatureExtractor(
        is_training=False,
        first_stage_features_stride=first_stage_features_stride,
        batch_norm_trainable=False,
        reuse_weights=None,
        weight_decay=0.0)

  def test_extract_proposal_features_returns_expected_size(self):
    feature_extractor = self._build_feature_extractor(
        first_stage_features_stride=16)
    preprocessed_inputs = tf.random_uniform(
        [1, 299, 299, 3], maxval=255, dtype=tf.float32)
    rpn_feature_map, _ = feature_extractor.extract_proposal_features(
        preprocessed_inputs, scope='TestScope')
    features_shape = tf.shape(rpn_feature_map)

    init_op = tf.global_variables_initializer()
    with self.test_session() as sess:
      sess.run(init_op)
      features_shape_out = sess.run(features_shape)
      self.assertAllEqual(features_shape_out, [1, 19, 19, 4320])

  def test_extract_proposal_features_input_size_224(self):
    feature_extractor = self._build_feature_extractor(
        first_stage_features_stride=16)
    preprocessed_inputs = tf.random_uniform(
        [1, 224, 224, 3], maxval=255, dtype=tf.float32)
    rpn_feature_map, _ = feature_extractor.extract_proposal_features(
        preprocessed_inputs, scope='TestScope')
    features_shape = tf.shape(rpn_feature_map)

    init_op = tf.global_variables_initializer()
    with self.test_session() as sess:
      sess.run(init_op)
      features_shape_out = sess.run(features_shape)
      self.assertAllEqual(features_shape_out, [1, 14, 14, 4320])

  def test_extract_proposal_features_input_size_112(self):
    feature_extractor = self._build_feature_extractor(
        first_stage_features_stride=16)
    preprocessed_inputs = tf.random_uniform(
        [1, 112, 112, 3], maxval=255, dtype=tf.float32)
    rpn_feature_map, _ = feature_extractor.extract_proposal_features(
        preprocessed_inputs, scope='TestScope')
    features_shape = tf.shape(rpn_feature_map)

    init_op = tf.global_variables_initializer()
    with self.test_session() as sess:
      sess.run(init_op)
      features_shape_out = sess.run(features_shape)
      self.assertAllEqual(features_shape_out, [1, 7, 7, 4320])

  def test_extract_proposal_features_dies_on_invalid_stride(self):
    with self.assertRaises(ValueError):
      self._build_feature_extractor(first_stage_features_stride=99)

  def test_extract_proposal_features_dies_with_incorrect_rank_inputs(self):
    feature_extractor = self._build_feature_extractor(
        first_stage_features_stride=16)
    preprocessed_inputs = tf.random_uniform(
        [224, 224, 3], maxval=255, dtype=tf.float32)
    with self.assertRaises(ValueError):
      feature_extractor.extract_proposal_features(
          preprocessed_inputs, scope='TestScope')

  def test_extract_box_classifier_features_returns_expected_size(self):
    feature_extractor = self._build_feature_extractor(
        first_stage_features_stride=16)
    proposal_feature_maps = tf.random_uniform(
        [2, 17, 17, 1088], maxval=255, dtype=tf.float32)
    proposal_classifier_features = (
        feature_extractor.extract_box_classifier_features(
            proposal_feature_maps, scope='TestScope'))
    features_shape = tf.shape(proposal_classifier_features)

    init_op = tf.global_variables_initializer()
    with self.test_session() as sess:
      sess.run(init_op)
      features_shape_out = sess.run(features_shape)
      self.assertAllEqual(features_shape_out, [2, 9, 9, 4320])

  def test_filter_scaling_computation(self):
    expected_filter_scaling = {
        ((4, 8), 2): 1.0,
        ((4, 8), 7): 2.0,
        ((4, 8), 8): 2.0,
        ((4, 8), 9): 4.0
    }
    for args, filter_scaling in expected_filter_scaling.items():
      reduction_indices, start_cell_num = args
      self.assertAlmostEqual(
          frcnn_pnas._filter_scaling(reduction_indices, start_cell_num),
          filter_scaling)


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