ExpansionTool: FORMAL DEFINITION OF CONCEPT-BASED QUERY EXPANSION AND CONSTRUCTION
msra
摘要
We develop a deductive data model for concept-based query expansion. It is based on three abstraction levels: the conceptual, linguistic and string levels. Concepts and relationships among them are represented at the conceptual level. The linguistic level gives natural language expressions for concepts. Each ex- pression has one or more matching patterns at the string level. The models specify the matching of the expression in database indices built in varying ways. The data model supports a declarative concept-based query expansion and formulation tool, the ExpansionTool, for heterogeneous IR system environments. Conceptual ex- pansion is implemented by a novel intelligent operator for traversing transitive re- lationships among cyclic concept networks. The number of expansion links fol- lowed, their types, and weights can be used to control expansion. A sample em- pirical experiment illustrating the use of the ExpansionTool in IR experiments is presented.
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