test_utils.py

# Copyright 2021 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
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# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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"""Test utilities for image classification tasks."""

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

import tensorflow as tf


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

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

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

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