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Computes the unnormalized score for a tag sequence.
tf.contrib.crf.crf_sequence_score( inputs, tag_indices, sequence_lengths, transition_params )
inputs: A [batch_size, max_seq_len, num_tags] tensor of unary potentials to use as input to the CRF layer.
tag_indices: A [batch_size, max_seq_len] matrix of tag indices for which we compute the unnormalized score.
sequence_lengths: A [batch_size] vector of true sequence lengths.
transition_params: A [num_tags, num_tags] transition matrix.
sequence_scores: A [batch_size] vector of unnormalized sequence scores.