# Copyright 2017 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 SavedModel simple save functionality."""

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

import os

from tensorflow.python.framework import ops
from tensorflow.python.ops import variables
from tensorflow.python.platform import test
from tensorflow.python.saved_model import loader
from tensorflow.python.saved_model import signature_constants
from tensorflow.python.saved_model import simple_save
from tensorflow.python.saved_model import tag_constants


class SimpleSaveTest(test.TestCase):

  def _init_and_validate_variable(self, sess, variable_name, variable_value):
    v = variables.Variable(variable_value, name=variable_name)
    sess.run(variables.global_variables_initializer())
    self.assertEqual(variable_value, v.eval())
    return v

  def _check_variable_info(self, actual_variable, expected_variable):
    self.assertEqual(actual_variable.name, expected_variable.name)
    self.assertEqual(actual_variable.dtype, expected_variable.dtype)
    self.assertEqual(len(actual_variable.shape), len(expected_variable.shape))
    for i in range(len(actual_variable.shape)):
      self.assertEqual(actual_variable.shape[i], expected_variable.shape[i])

  def _check_tensor_info(self, actual_tensor_info, expected_tensor):
    self.assertEqual(actual_tensor_info.name, expected_tensor.name)
    self.assertEqual(actual_tensor_info.dtype, expected_tensor.dtype)
    self.assertEqual(
        len(actual_tensor_info.tensor_shape.dim), len(expected_tensor.shape))
    for i in range(len(actual_tensor_info.tensor_shape.dim)):
      self.assertEqual(actual_tensor_info.tensor_shape.dim[i].size,
                       expected_tensor.shape[i])

  def testSimpleSave(self):
    """Test simple_save that uses the default parameters."""
    export_dir = os.path.join(test.get_temp_dir(),
                              "test_simple_save")

    # Initialize input and output variables and save a prediction graph using
    # the default parameters.
    with self.session(graph=ops.Graph()) as sess:
      var_x = self._init_and_validate_variable(sess, "var_x", 1)
      var_y = self._init_and_validate_variable(sess, "var_y", 2)
      inputs = {"x": var_x}
      outputs = {"y": var_y}
      simple_save.simple_save(sess, export_dir, inputs, outputs)

    # Restore the graph with a valid tag and check the global variables and
    # signature def map.
    with self.session(graph=ops.Graph()) as sess:
      graph = loader.load(sess, [tag_constants.SERVING], export_dir)
      collection_vars = ops.get_collection(ops.GraphKeys.GLOBAL_VARIABLES)

      # Check value and metadata of the saved variables.
      self.assertEqual(len(collection_vars), 2)
      self.assertEqual(1, collection_vars[0].eval())
      self.assertEqual(2, collection_vars[1].eval())
      self._check_variable_info(collection_vars[0], var_x)
      self._check_variable_info(collection_vars[1], var_y)

      # Check that the appropriate signature_def_map is created with the
      # default key and method name, and the specified inputs and outputs.
      signature_def_map = graph.signature_def
      self.assertEqual(1, len(signature_def_map))
      self.assertEqual(signature_constants.DEFAULT_SERVING_SIGNATURE_DEF_KEY,
                       list(signature_def_map.keys())[0])

      signature_def = signature_def_map[
          signature_constants.DEFAULT_SERVING_SIGNATURE_DEF_KEY]
      self.assertEqual(signature_constants.PREDICT_METHOD_NAME,
                       signature_def.method_name)

      self.assertEqual(1, len(signature_def.inputs))
      self._check_tensor_info(signature_def.inputs["x"], var_x)
      self.assertEqual(1, len(signature_def.outputs))
      self._check_tensor_info(signature_def.outputs["y"], var_y)


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