Warning: This project is deprecated. TensorFlow Addons has stopped development, The project will only be providing minimal maintenance releases until May 2024. See the full announcement here or on github.


Computes the alpha values in a linear-chain CRF.

See http://www.cs.columbia.edu/~mcollins/fb.pdf for reference.

inputs A [batch_size, num_tags] matrix of unary potentials.
state A [batch_size, num_tags] matrix containing the previous alpha values.
transition_params A [num_tags, num_tags] matrix of binary potentials. This matrix is expanded into a [1, num_tags, num_tags] in preparation for the broadcast summation occurring within the cell.
sequence_lengths A [batch_size] vector of true sequence lengths.

new_alphas A [batch_size, num_tags] matrix containing the new alpha values.