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Question Answering via Question-to-Question Mapping

Question Answering via Question-to-Question Mapping. Tait Larson Johnson Gong Josh Daniel. Overview. QA systems on the web currently are popular Common QA systems extract facts from the web, match natural language questions to facts Our approach

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Question Answering via Question-to-Question Mapping

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  1. Question Answering via Question-to-Question Mapping Tait Larson Johnson Gong Josh Daniel

  2. Overview • QA systems on the web currently are popular • Common QA systems extract facts from the web, match natural language questions to facts • Our approach • Take pre-answered questions, and match questions to questions • Hopefully useful because of the vast amount of pre-answered questions available on the web • Google answers • Yahoo answers • Lawguru.com • FAQs • Do this via several NLP techniques, primarily focused around query expansion using Wordnet and language model

  3. Query Expansion • POS tagging – preprocess • Search through domain of semantically similar sentences • Goal: Generate phrases that will identify semantically equivalent questions in our corpus • Semantic expansion • Language Model for pruning • Prune incorrect word sense • Trained on question repository • “Can I get into Stanford?” -> “Butt I get into Stanford?” • Phrase Extraction

  4. Information Retrieval • Different from traditional IR • Bigrams • Index • Query • No stop words • No stemming • Why? • These choice emphasize semantic structure of question

  5. Results • Us vs Yahoo • Test questions from “unresolved” Yahoo questions • Metric - Mean Reciprocal Rank • We only index questions, Yahoo indexes answers also

  6. Example Results • A sharp pain in the center of the chest breastbone area? • Keep getting a throbbing pain in the middle of my rib cage . any idea what it could be? • Do Bush baked beans give you gas • Do baked beans make you fart???? yes/no? • Why i sweat and how can i stop this problem • How can I stop sweating? I sweat more when it’s cold…

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