LatticeBased Statistical Spoken DocumentRetrieval基于统计的语音文件检索格.pptVIP

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LatticeBased Statistical Spoken DocumentRetrieval基于统计的语音文件检索格.ppt

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LatticeBased Statistical Spoken DocumentRetrieval基于统计的语音文件检索格

Lattice-Based Statistical Spoken Document Retrieval Chia Tee Kiah Ph. D. thesis Department of Computer Science School of Computing National University of Singapore Supervisors: A/Prof. Ng Hwee Tou (NUS), Dr. Li Haizhou (I2R) Outline Introduction Original contribution Background Lattice-based SDR under statistical model Other SDR methods Experiments on SDR with short queries Query-by-example SDR Conclusion Introduction:Spoken Document Retrieval Information retrieval (IR) Search for items of data according to user’s info. need Spoken document retrieval (SDR) IR on speech recordings Growing in importance — more more speech data stored: news broadcasts, voice mails, … SDR more difficult than text IR Currently need automatic speech recognition (ASR) 1-best transcripts from ASR are error-prone Word error rate for noisy, spontaneous speech may be 50% Introduction: Lattices Lattice — connected directed acyclic graph James Young (1994), James (1995) Each edge labeled with term hypothesis, probs. Each path gives hypothesized seq. of terms, its probability Use alternative hypotheses to overcome errors in 1-best transcripts — lattice-based SDR Introduction: Lattices Outline Introduction Original contribution Background Lattice-based SDR under statistical model Other SDR methods Experiments on SDR with short queries Query-by-example SDR Conclusion Original Contribution A method for lattice-based SDR using a statistical IR model (Song Croft 1999) Calculate expected count of each word in each lattice From counts, estimate statistical lang. models for docs. Compute query-doc. relevance as probability Previous lattice-based SDR methods all based on vector space IR model! Extension to query-by-example SDR SDR where queries are also full-fledged spoken docs. Presented in EMNLP-CoNLL 2007, SIGIR 2008 Outline Introduction Original contribution Background Lattice-based SDR under statistical model Other SDR methods Experiments on SDR with short queries Query-by-example SDR Con