crf_multitag_sequence_score {tfaddons} | R Documentation |
CRF multitag sequence score
Description
Computes the unnormalized score of all tag sequences matching
Usage
crf_multitag_sequence_score(
inputs,
tag_bitmap,
sequence_lengths,
transition_params
)
Arguments
inputs |
A [batch_size, max_seq_len, num_tags] tensor of unary potentials to use as input to the CRF layer. |
tag_bitmap |
A [batch_size, max_seq_len, num_tags] boolean tensor representing all active tags at each index for which to calculate the unnormalized score. |
sequence_lengths |
A [batch_size] vector of true sequence lengths. |
transition_params |
A [num_tags, num_tags] transition matrix. |
Details
tag_bitmap. tag_bitmap enables more than one tag to be considered correct at each time step. This is useful when an observed output at a given time step is consistent with more than one tag, and thus the log likelihood of that observation must take into account all possible consistent tags. Using one-hot vectors in tag_bitmap gives results identical to crf_sequence_score.
Value
sequence_scores: A [batch_size] vector of unnormalized sequence scores.