message: Improve crf documentation.
diff: @@ -385,7 +385,7 @@ class CrfDecodeBackwardRnnCell(rnn_cell.RNNCell):
  """Initialize the CrfDecodeBackwardRnnCell.
  Args:
  - num_tags
  + num_tags: An integer.
  """
  self._num_tags = num_tags
  @@ -426,16 +426,16 @@ def crf_decode(potentials, transition_params, sequence_length):
  This is a function for tensor.
  Args:
  - potentials: A [batch_size, max_seq_len, num_tags] tensor, matrix of
  + potentials: A [batch_size, max_seq_len, num_tags] tensor of
  unary potentials.
  - transition_params: A [num_tags, num_tags] tensor, matrix of
  + transition_params: A [num_tags, num_tags] matrix of
  binary potentials.
  - sequence_length: A [batch_size] tensor, containing sequence lengths.
  + sequence_length: A [batch_size] tensor of true sequence lengths.
  Returns:
  - decode_tags: A [batch_size, max_seq_len] tensor, with dtype tf.int32.
  + decode_tags: A [batch_size, max_seq_len] tensor, with dtype `tf.int32`.
  Contains the highest scoring tag indicies.
  - best_score: A [batch_size] tensor, containing the score of decode_tags.
  + best_score: A [batch_size] tensor, containing the score of `decode_tags`.
  """
  # For simplicity, in shape comments, denote:
  # 'batch_size' by 'B', 'max_seq_len' by 'T' , 'num_tags' by 'O' (output).
  