# 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 sequence_layers."""

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

import numpy as np
import tensorflow as tf
from tensorflow.contrib import slim

import model
import sequence_layers


def fake_net(batch_size, num_features, feature_size):
  return tf.convert_to_tensor(
      np.random.uniform(size=(batch_size, num_features, feature_size)),
      dtype=tf.float32)


def fake_labels(batch_size, seq_length, num_char_classes):
  labels_np = tf.convert_to_tensor(
      np.random.randint(
          low=0, high=num_char_classes, size=(batch_size, seq_length)))
  return slim.one_hot_encoding(labels_np, num_classes=num_char_classes)


def create_layer(layer_class, batch_size, seq_length, num_char_classes):
  model_params = model.ModelParams(
      num_char_classes=num_char_classes,
      seq_length=seq_length,
      num_views=1,
      null_code=num_char_classes)
  net = fake_net(
      batch_size=batch_size, num_features=seq_length * 5, feature_size=6)
  labels_one_hot = fake_labels(batch_size, seq_length, num_char_classes)
  layer_params = sequence_layers.SequenceLayerParams(
      num_lstm_units=10, weight_decay=0.00004, lstm_state_clip_value=10.0)
  return layer_class(net, labels_one_hot, model_params, layer_params)


class SequenceLayersTest(tf.test.TestCase):
  def test_net_slice_char_logits_with_correct_shape(self):
    batch_size = 2
    seq_length = 4
    num_char_classes = 3

    layer = create_layer(sequence_layers.NetSlice, batch_size, seq_length,
                         num_char_classes)
    char_logits = layer.create_logits()

    self.assertEqual(
        tf.TensorShape([batch_size, seq_length, num_char_classes]),
        char_logits.get_shape())

  def test_net_slice_with_autoregression_char_logits_with_correct_shape(self):
    batch_size = 2
    seq_length = 4
    num_char_classes = 3

    layer = create_layer(sequence_layers.NetSliceWithAutoregression,
                         batch_size, seq_length, num_char_classes)
    char_logits = layer.create_logits()

    self.assertEqual(
        tf.TensorShape([batch_size, seq_length, num_char_classes]),
        char_logits.get_shape())

  def test_attention_char_logits_with_correct_shape(self):
    batch_size = 2
    seq_length = 4
    num_char_classes = 3

    layer = create_layer(sequence_layers.Attention, batch_size, seq_length,
                         num_char_classes)
    char_logits = layer.create_logits()

    self.assertEqual(
        tf.TensorShape([batch_size, seq_length, num_char_classes]),
        char_logits.get_shape())

  def test_attention_with_autoregression_char_logits_with_correct_shape(self):
    batch_size = 2
    seq_length = 4
    num_char_classes = 3

    layer = create_layer(sequence_layers.AttentionWithAutoregression,
                         batch_size, seq_length, num_char_classes)
    char_logits = layer.create_logits()

    self.assertEqual(
        tf.TensorShape([batch_size, seq_length, num_char_classes]),
        char_logits.get_shape())


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