forward-backward algorithm

Fetched 2026-10-26 (cache).

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Noun

1. An [[inference]] algorithm for [[hidden Markov model]]s which computes the posterior marginals of all hidden state variables given a sequence of observations/emissions. It uses [[dynamic programming]] to compute the values in two passes, the first going forward in time and the second backward.
2. Any algorithm belonging to the general class that operate on sequence models in a forward-backward manner.

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