Query Transformation Through Approximated Lsi Computation

The Latent Semantic Indexing (LSI) proved to be an effectife technique in the field of Information Restrieval. Its drawbacks are the time needed to compute the SVD decomposition and to asnwer queries, since the query must be compared against each document in the collection. In this paper we present a techique that uses the information computed by the traditional LSI to provide a fast online answer to the users. Informally, if compared to the traditional LSI, we can say that instead of returning the documents that are related to the concepts in the query, we return the documents that contain terms that are related to the concepts in your query