# Copyright 2018 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.
# ==============================================================================
"""Test utility."""

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

import numpy as np

from tensorflow.python.framework import dtypes
from tensorflow.python.ops import variables
from tensorflow.python.ops.parallel_for import control_flow_ops as pfor_control_flow_ops
from tensorflow.python.platform import test
from tensorflow.python.util import nest


class PForTestCase(test.TestCase):
  """Base class for test cases."""

  def _run_targets(self, targets1, targets2=None, run_init=True):
    targets1 = nest.flatten(targets1)
    targets2 = ([] if targets2 is None else nest.flatten(targets2))
    assert len(targets1) == len(targets2) or not targets2
    if run_init:
      init = variables.global_variables_initializer()
      self.evaluate(init)
    return self.evaluate(targets1 + targets2)

  def run_and_assert_equal(self, targets1, targets2):
    outputs = self._run_targets(targets1, targets2)
    outputs = nest.flatten(outputs)  # flatten SparseTensorValues
    n = len(outputs) // 2
    for i in range(n):
      if outputs[i + n].dtype != np.object:
        self.assertAllClose(outputs[i + n], outputs[i], rtol=1e-4, atol=1e-5)
      else:
        self.assertAllEqual(outputs[i + n], outputs[i])

  def _test_loop_fn(self, loop_fn, iters,
                    loop_fn_dtypes=dtypes.float32,
                    parallel_iterations=None):
    t1 = pfor_control_flow_ops.pfor(loop_fn, iters=iters,
                                    parallel_iterations=parallel_iterations)
    t2 = pfor_control_flow_ops.for_loop(loop_fn, loop_fn_dtypes, iters=iters,
                                        parallel_iterations=parallel_iterations)
    self.run_and_assert_equal(t1, t2)
