CRF (contrib) Linear-chain CRF layer. tf.contrib.crf.crf_sequence_score tf.contrib.crf.crf_log_norm tf.contrib.crf.crf_log_likelihood tf.contrib.crf.crf_unary_score tf.contrib.crf.crf_binary_score tf.contrib.crf.CrfForwardRnnCell tf.contrib.crf.viterbi_decode