Query Expansion in Resource-Scarce Languages: A Multilingual Framework Utilizing Document Structure

摘要

, which expands the query with related terms by (i) using a resource-rich assisting language and (ii) giving varied importance to the expansion terms depending on their position of occurrence in the document. Our system uses the help of an assisting language to expand the query in order to improve system recall. We propose a systematic expansion model for weighting the expansion terms coming from different parts of the document. To combine the expansion terms from query language and assisting language, we propose a heuristics-based fusion model. Our experimental results show an improvement over other PRF techniques in both precision and recall for multiple resource-scarce languages like