Method for using dual indices to support query expansion, relevance/non-relevance models, blind/relevance feedback and an intelligent search interface

摘要

A method for using dual indices to support query expansion, relevance/non-relevance models, blind/relevance feedback and an intelligent search interface, the method comprising: accessing an inverted index to obtain an initial retrieval of results in response to a query, and to generate a rank list of the results, the results referring to information units (IUs) where the query occurs; and determining a number of “N” IUs in the results that are assumed to be relevant by accessing a forward index; wherein the forward index and inverted index have pointers to locations in the IUs where terms of the query occur, and the forward index retrieves a term frequency vector of the IU or a set of contexts of the IU.

主权项

1. A method for using dual indices to support query expansion, the method comprising:
accessing an inverted index to obtain an initial retrieval of results in response to a query using a computing device; generating a rank list of the results using the computing device, where the results referring to information units (IUs) where terms of the query occur; determining a number of “N” IUs in the results that are regarded as relevant by accessing a forward index using the computing device; computing query expansion weights for a portion of the relevant determined number of “N” IUs using the computing device; computing query expansion terms based on the initial retrieval of results and the computed query expansion weights using the computing device; formulating a new search query comprising the computed query expansion terms using the computing device; and re-ranking the rank list of the results based on the new search query using the computing device.