test_utils.py

# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
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# 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
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"""Test utilities for image classification tasks."""

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

from tensorflow.python.keras import backend
from tensorflow.python.keras import layers
from tensorflow.python.keras import models


def trivial_model(num_classes):
  """Trivial model for ImageNet dataset."""

  input_shape = (224, 224, 3)
  img_input = layers.Input(shape=input_shape)

  x = layers.Lambda(lambda x: backend.reshape(x, [-1, 224 * 224 * 3]),
                    name='reshape')(img_input)
  x = layers.Dense(1, name='fc1')(x)
  x = layers.Dense(num_classes, name='fc1000')(x)
  x = layers.Activation('softmax', dtype='float32')(x)

  return models.Model(img_input, x, name='trivial')