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# Licensed under the Apache License, Version 2.0 (the "License");
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"""Test the Keras MNIST model on GPU."""

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

import functools

from absl.testing import parameterized
import tensorflow as tf, tf_keras

from tensorflow.python.distribute import combinations
from tensorflow.python.distribute import strategy_combinations
from official.legacy.image_classification import mnist_main
from official.utils.testing import integration


mnist_main.define_mnist_flags()


def eager_strategy_combinations():
  return combinations.combine(
      distribution=[
          strategy_combinations.default_strategy,
          strategy_combinations.cloud_tpu_strategy,
          strategy_combinations.one_device_strategy_gpu,
      ],)


class KerasMnistTest(tf.test.TestCase, parameterized.TestCase):
  """Unit tests for sample Keras MNIST model."""
  _tempdir = None

  @classmethod
  def setUpClass(cls):  # pylint: disable=invalid-name
    super(KerasMnistTest, cls).setUpClass()

  def tearDown(self):
    super(KerasMnistTest, self).tearDown()
    tf.io.gfile.rmtree(self.get_temp_dir())

  @combinations.generate(eager_strategy_combinations())
  def test_end_to_end(self, distribution):
    """Test Keras MNIST model with `strategy`."""

    extra_flags = [
        "-train_epochs",
        "1",
        # Let TFDS find the metadata folder automatically
        "--data_dir="
    ]

    dummy_data = (
        tf.ones(shape=(10, 28, 28, 1), dtype=tf.int32),
        tf.range(10),
    )
    datasets = (
        tf.data.Dataset.from_tensor_slices(dummy_data),
        tf.data.Dataset.from_tensor_slices(dummy_data),
    )

    run = functools.partial(
        mnist_main.run,
        datasets_override=datasets,
        strategy_override=distribution)

    integration.run_synthetic(
        main=run,
        synth=False,
        tmp_root=self.create_tempdir().full_path,
        extra_flags=extra_flags)


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