12.07.2015 Views

Large Vocabulary Continuous Speech Recognition - Berlin Chen

Large Vocabulary Continuous Speech Recognition - Berlin Chen

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Word-Conditioned Search (1/3)• Word (history)-conditioned Search– A virtual/imaginary tree copy explored for linguistic context ofactive search hypotheses– Search hypotheses recombined at tree root nodes according tolanguage modeling (or the history)P(‧| 一 群 影 響 )P(‧| 影 響 生 活 )一 群影 響生 活疫 情影 響生 命For n-gram language modeling:- Retain distinct n-1-gram word historiesP(‧| 疫 情 影 響 ) P(‧| 影 響 生 命 )V 2 trees V 2 trees V 2 trees– Time is the independent variable; expansion proceeds in parallelin a “breadth-first” manner<strong>Speech</strong> – <strong>Berlin</strong> <strong>Chen</strong> 15

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