# 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
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# ==============================================================================

"""Tests for ssd_pnas_feature_extractor."""
import numpy as np
import tensorflow as tf
from tensorflow.contrib import slim as contrib_slim

from object_detection.models import ssd_feature_extractor_test
from object_detection.models import ssd_pnasnet_feature_extractor

slim = contrib_slim


class SsdPnasNetFeatureExtractorTest(
    ssd_feature_extractor_test.SsdFeatureExtractorTestBase):

  def _create_feature_extractor(self,
                                depth_multiplier,
                                pad_to_multiple,
                                use_explicit_padding=False,
                                num_layers=6,
                                is_training=True):
    """Constructs a new feature extractor.

    Args:
      depth_multiplier: float depth multiplier for feature extractor
      pad_to_multiple: the nearest multiple to zero pad the input height and
        width dimensions to.
      use_explicit_padding: Use 'VALID' padding for convolutions, but prepad
        inputs so that the output dimensions are the same as if 'SAME' padding
        were used.
      num_layers: number of SSD layers.
      is_training: whether the network is in training mode.
    Returns:
      an ssd_meta_arch.SSDFeatureExtractor object.
    """
    min_depth = 32
    return ssd_pnasnet_feature_extractor.SSDPNASNetFeatureExtractor(
        is_training,
        depth_multiplier,
        min_depth,
        pad_to_multiple,
        self.conv_hyperparams_fn,
        use_explicit_padding=use_explicit_padding,
        num_layers=num_layers)

  def test_extract_features_returns_correct_shapes_128(self):
    image_height = 128
    image_width = 128
    depth_multiplier = 1.0
    pad_to_multiple = 1
    expected_feature_map_shape = [(2, 8, 8, 2160), (2, 4, 4, 4320),
                                  (2, 2, 2, 512), (2, 1, 1, 256),
                                  (2, 1, 1, 256), (2, 1, 1, 128)]
    self.check_extract_features_returns_correct_shape(
        2, image_height, image_width, depth_multiplier, pad_to_multiple,
        expected_feature_map_shape)

  def test_extract_features_returns_correct_shapes_299(self):
    image_height = 299
    image_width = 299
    depth_multiplier = 1.0
    pad_to_multiple = 1
    expected_feature_map_shape = [(2, 19, 19, 2160), (2, 10, 10, 4320),
                                  (2, 5, 5, 512), (2, 3, 3, 256),
                                  (2, 2, 2, 256), (2, 1, 1, 128)]
    self.check_extract_features_returns_correct_shape(
        2, image_height, image_width, depth_multiplier, pad_to_multiple,
        expected_feature_map_shape)

  def test_preprocess_returns_correct_value_range(self):
    image_height = 128
    image_width = 128
    depth_multiplier = 1
    pad_to_multiple = 1
    test_image = np.random.rand(2, image_height, image_width, 3)
    feature_extractor = self._create_feature_extractor(depth_multiplier,
                                                       pad_to_multiple)
    preprocessed_image = feature_extractor.preprocess(test_image)
    self.assertTrue(np.all(np.less_equal(np.abs(preprocessed_image), 1.0)))

  def test_extract_features_with_fewer_layers(self):
    image_height = 128
    image_width = 128
    depth_multiplier = 1.0
    pad_to_multiple = 1
    expected_feature_map_shape = [(2, 8, 8, 2160), (2, 4, 4, 4320),
                                  (2, 2, 2, 512), (2, 1, 1, 256)]
    self.check_extract_features_returns_correct_shape(
        2, image_height, image_width, depth_multiplier, pad_to_multiple,
        expected_feature_map_shape, num_layers=4)


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