The Inside-Outside Algorithm
نویسنده
چکیده
This note describes the inside-outside algorithm. The inside-outside algorithm has very important applications to statistical models based on context-free grammars. In particular, it is used in EM estimation of probabilistic context-free grammars, and it is used in estimation of discriminative models for context-free parsing. As we will see, the inside-outside algorithm has many similarities to the forwardbackward algorithm for hidden Markov models. It computes analogous quantities to the forward and backward terms, for context-free trees.
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