# Copyright 2016 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 MobileNet application."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import numpy as np

from tensorflow.python import keras
from tensorflow.python.platform import test


class MobileNetTest(test.TestCase):

  def test_with_top(self):
    model = keras.applications.MobileNet(weights=None)
    self.assertEqual(model.output_shape, (None, 1000))

  def test_no_top(self):
    model = keras.applications.MobileNet(weights=None, include_top=False)
    self.assertEqual(model.output_shape, (None, None, None, 1024))

  def test_with_pooling(self):
    model = keras.applications.MobileNet(weights=None,
                                         include_top=False,
                                         pooling='avg')
    self.assertEqual(model.output_shape, (None, 1024))

  def test_weight_loading(self):
    with self.assertRaises(ValueError):
      keras.applications.MobileNet(weights='unknown',
                                   include_top=False)
    with self.assertRaises(ValueError):
      keras.applications.MobileNet(weights='imagenet',
                                   classes=2000)

  def test_preprocess_input(self):
    x = np.random.uniform(0, 255, (2, 300, 200, 3))
    out1 = keras.applications.mobilenet.preprocess_input(x)
    self.assertAllClose(np.mean(out1), 0., atol=0.1)

  def test_invalid_use_cases(self):
    keras.backend.set_image_data_format('channels_first')
    model = keras.applications.MobileNet(weights=None)
    self.assertEqual(model.output_shape, (None, 1000))
    keras.backend.set_image_data_format('channels_last')

  def test_mobilenet_variable_input_channels(self):
    input_shape = (None, None, 1)
    model = keras.applications.MobileNet(weights=None,
                                         include_top=False,
                                         input_shape=input_shape)
    self.assertEqual(model.output_shape, (None, None, None, 1024))

    input_shape = (None, None, 4)
    model = keras.applications.MobileNet(weights=None,
                                         include_top=False,
                                         input_shape=input_shape)
    self.assertEqual(model.output_shape, (None, None, None, 1024))

  def test_mobilenet_image_size(self):
    with self.test_session():
      valid_image_sizes = [128, 160, 192, 224]
      for size in valid_image_sizes:
        keras.backend.set_image_data_format('channels_last')
        input_shape = (size, size, 3)
        model = keras.applications.MobileNet(input_shape=input_shape,
                                             weights=None,
                                             include_top=True)
        self.assertEqual(model.input_shape, (None,) + input_shape)

        keras.backend.set_image_data_format('channels_first')
        input_shape = (3, size, size)
        model = keras.applications.MobileNet(input_shape=input_shape,
                                             weights=None,
                                             include_top=True)
        self.assertEqual(model.input_shape, (None,) + input_shape)

      keras.backend.set_image_data_format('channels_last')
      invalid_image_shape = (112, 112, 3)
      with self.assertRaises(ValueError):
        model = keras.applications.MobileNet(input_shape=invalid_image_shape,
                                             weights='imagenet',
                                             include_top=True)

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