Concepts and Context for Information Retrieval

W. Bruce Croft

Center for Intelligent Information Retrieval (CIIR)
Department of Computer Science
University of Massachusetts, Amherst


Most people are now very familiar with word-based statistical information retrieval through their use of web search engines. Search failures with these engines are often blamed on their reliance on words rather than "concepts." This talk will describe the differences between these two representations from an IR perspective, with an emphasis on the importance of context or word co-occurrence. Examples of research at the CIIR that exploits context will be given, including corpus-based stemming, query expansion, phrase representations, cross-lingual retrieval, and analysis of "core concepts."

Luis Gravano