Patent ID: 8775410
Filing Date: 2014-07-08
Classification: G06F

Abstract:
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.