def test_greedy_embedding_helper(self):
"""Tests with tf.contrib.seq2seq.GreedyEmbeddingHelper
"""
decoder = TransformerDecoder(token_pos_embedder=self._embedding_fn,
vocab_size=self._vocab_size,
output_layer=self._output_layer)
decoder.eval()
helper = decoder_helpers.GreedyEmbeddingHelper(self._start_tokens,
self._end_token)
outputs, length = decoder(
memory=self._memory,
memory_sequence_length=self._memory_sequence_length,
memory_attention_bias=None,
helper=helper,
max_decoding_length=self._max_decode_len)
self.assertIsInstance(outputs, TransformerDecoderOutput)
def test_infer_greedy_with_context_without_memory(self):
"""Tests train_greedy with context
"""
decoder = TransformerDecoder(token_pos_embedder=self._embedding_fn,
vocab_size=self._vocab_size,
output_layer=self._output_layer)
decoder.eval()
outputs, length = decoder(memory=None,
memory_sequence_length=None,
memory_attention_bias=None,
inputs=None,
decoding_strategy='infer_greedy',
context=self._context,
context_sequence_length=self._context_length,
end_token=self._end_token,
max_decoding_length=self._max_decode_len)
self.assertIsInstance(outputs, TransformerDecoderOutput)
def test_decode_infer_sample(self):
"""Tests infer_sample
"""
decoder = TransformerDecoder(token_pos_embedder=self._embedding_fn,
vocab_size=self._vocab_size,
output_layer=self._output_layer)
decoder.eval()
helper = decoder_helpers.SampleEmbeddingHelper(self._start_tokens,
self._end_token)
outputs, length = decoder(
memory=self._memory,
memory_sequence_length=self._memory_sequence_length,
memory_attention_bias=None,
inputs=None,
helper=helper,
max_decoding_length=self._max_decode_len)
self.assertIsInstance(outputs, TransformerDecoderOutput)
def test_beam_search(self):
"""Tests beam_search
"""
decoder = TransformerDecoder(token_pos_embedder=self._embedding_fn,
vocab_size=self._vocab_size,
output_layer=self._output_layer)
decoder.eval()
beam_width = 5
outputs = decoder(memory=self._memory,
memory_sequence_length=self._memory_sequence_length,
memory_attention_bias=None,
inputs=None,
beam_width=beam_width,
start_tokens=self._start_tokens,
end_token=self._end_token,
max_decoding_length=self._max_decode_len)
self.assertEqual(outputs['log_prob'].size(),
(self._batch_size, beam_width))
self.assertEqual(outputs['sample_id'].size(0), self._batch_size)
self.assertLessEqual(outputs['sample_id'].size(2),
self._max_decode_len)
self.assertEqual(outputs['sample_id'].size(2), beam_width)