concepts

Parsimonious concept modeling

In many collections, documents are annotated using concepts from a structured knowledge source such as an ontology or thesaurus. Examples include the news domain, where each news item is categorized according to the nature of the event that took place, and Wikipedia, with its per-article categories. These categorizing systems originally…

Integrating Conceptual Knowledge into Relevance Models: A Model and Estimation Method

We address the issue of combining explicit background knowledge with pseudo-relevance feedback from within a document collection. To this end, we use document-level annotations in tandem with generative language models to generate terms from pseudo-relevant documents and bias the probability estimates of expansion terms in a principled manner. By applying…
TREC

Expanding Queries Using Multiple Resources

We describe our participation in the TREC 2006 Genomics track, in which our main focus was on query expansion. We hypothesized that applying query expansion techniques would help us both to identify and retrieve synonymous terms, and to cope with ambiguity. To this end, we developed several collection-specific as well…