# Copyright 2019 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 configs for transpose_conv."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import numpy as np
import tensorflow.compat.v1 as tf
from tensorflow.lite.testing.zip_test_utils import create_tensor_data
from tensorflow.lite.testing.zip_test_utils import make_zip_of_tests
from tensorflow.lite.testing.zip_test_utils import register_make_test_function


# Since compute output_shape is fairly complicated for
# tf.nn.conv2d_transpose input_sizes argument, so we here first perform a
# "conv2d" operation to get the output, then we use the output to feed in
# tf.nn.conv2d_backprop_input.
# This test will depend on the "conv2d" operation's correctness.
@register_make_test_function()
def make_transpose_conv_tests(options):
  """Make a set of tests to do transpose_conv."""

  # Tensorflow only supports equal strides
  test_parameters = [
      {
          "input_shape": [[1, 3, 4, 1], [1, 10, 10, 3], [3, 20, 20, 1]],
          "filter_size": [[1, 1], [1, 2], [3, 3]],
          "strides": [[1, 1, 1, 1], [1, 3, 3, 1]],
          "padding": ["SAME", "VALID"],
          "data_format": ["NHWC"],
          "channel_multiplier": [1, 2],
          "output_shape": [[]],
          "fully_quantize": [False]
      },
      # TODO(yunluli): Adding simple tests for now to unblock edgetpu debugging.
      # Need to add more test cases.
      {
          "input_shape": [[1, 3, 3, 1]],
          "filter_size": [[3, 3, 2, 1]],
          "strides": [[1, 1, 1, 1]],
          "padding": ["SAME"],
          "data_format": ["NHWC"],
          "channel_multiplier": [1],
          "output_shape": [[1, 3, 3, 2]],
          "fully_quantize": [True]
      },
      {
          "input_shape": [[1, 3, 3, 1]],
          "filter_size": [[3, 3, 2, 1]],
          "strides": [[1, 2, 2, 1]],
          "padding": ["SAME"],
          "data_format": ["NHWC"],
          "channel_multiplier": [1],
          "output_shape": [[1, 6, 6, 2]],
          "fully_quantize": [True]
      },
      {
          "input_shape": [[1, 4, 3, 1]],
          "filter_size": [[3, 3, 2, 1]],
          "strides": [[1, 2, 2, 1]],
          "padding": ["SAME"],
          "data_format": ["NHWC"],
          "channel_multiplier": [1],
          "output_shape": [[1, 8, 6, 2]],
          "fully_quantize": [True]
      }
  ]

  def get_tensor_shapes(parameters):
    input_shape = parameters["input_shape"]
    filter_size = parameters["filter_size"]
    if not parameters["fully_quantize"]:
      filter_shape = filter_size + [
          input_shape[3], parameters["channel_multiplier"]
      ]
      return [input_shape, filter_shape]
    return [input_shape, filter_size]

  def build_graph(parameters):
    """Build a transpose_conv graph given `parameters`."""
    input_shape, filter_shape = get_tensor_shapes(parameters)
    input_tensor = tf.compat.v1.placeholder(
        dtype=tf.float32, name="input", shape=input_shape)

    filter_input = tf.compat.v1.placeholder(
        dtype=tf.float32, name="filter", shape=filter_shape)

    if not parameters["fully_quantize"]:
      input_tensors = [input_tensor, filter_input]
      conv_outputs = tf.nn.conv2d(
          input_tensor,
          filter_input,
          strides=parameters["strides"],
          padding=parameters["padding"],
          data_format=parameters["data_format"])
      out = tf.compat.v1.nn.conv2d_backprop_input(
          input_shape,
          filter_input,
          conv_outputs,
          strides=parameters["strides"],
          padding=parameters["padding"],
          data_format=parameters["data_format"])
    else:
      input_tensors = [input_tensor]
      filter_input = create_tensor_data(
          np.float32, filter_shape, min_value=-1, max_value=1)
      out = tf.nn.conv2d_transpose(
          input_tensor,
          filter_input,
          parameters["output_shape"],
          strides=parameters["strides"],
          padding=parameters["padding"],
          data_format=parameters["data_format"])

    return input_tensors, [out]

  def build_inputs(parameters, sess, inputs, outputs):
    input_shape, filter_shape = get_tensor_shapes(parameters)
    if not parameters["fully_quantize"]:
      values = [
          create_tensor_data(np.float32, input_shape),
          create_tensor_data(np.float32, filter_shape)
      ]
    else:
      values = [
          create_tensor_data(
              np.float32, input_shape, min_value=-1, max_value=1),
      ]

    return values, sess.run(outputs, feed_dict=dict(zip(inputs, values)))

  make_zip_of_tests(options, test_parameters, build_graph, build_inputs)
