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- W2079164875 abstract "We present a directed Markov random field (MRF) model that combines n-gram models, probabilistic context free grammars (PCFGs) and probabilistic latent semantic analysis (PLSA) for the purpose of statistical language modeling. Even though the composite directed MRF model potentially has an exponential number of loops and becomes a context sensitive grammar, we are nevertheless able to estimate its parameters in cubic time using an efficient modified EM method, the generalized inside-outside algorithm, which extends the inside-outside algorithm to incorporate the effects of the n-gram and PLSA language models. We generalize various smoothing techniques to alleviate the sparseness of n-gram counts in cases where there are hidden variables. We also derive an analogous algorithm to calculate the probability of initial subsequence of a sentence, generated by the composite language model. Our experimental results on the Wall Street Journal corpus show that we obtain significant reductions in perplexity compared to the state-of-the-art baseline trigram model with Good-Turing and Kneser-Ney smoothings." @default.
- W2079164875 created "2016-06-24" @default.
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- W2079164875 date "2005-01-01" @default.
- W2079164875 modified "2023-10-16" @default.
- W2079164875 title "Exploiting syntactic, semantic and lexical regularities in language modeling via directed Markov random fields" @default.
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- W2079164875 doi "https://doi.org/10.1145/1102351.1102471" @default.
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