Computes backward decoding in a linear-chain CRF.
crf_decode_backward(inputs, state)
| inputs | A [batch_size, num_tags] matrix of backpointer of next step (in time order). |
|---|---|
| state | A [batch_size, 1] matrix of tag index of next step. |
new_tags: A [batch_size, num_tags] tensor containing the new tag indices.