Exploiting hyperlinks to learn a retrieval model

Information Retrieval (IR) aims at solving a ranking problem: given a query q and a corpus C, the documents of C should be ranked such that the documents relevant to q appear above the others. This task is gen-erally performed by ranking the documents d ∈ C according to their similarity with respect to q, sim(q, d). The identification of an effec-tive function a, b → sim(a, b) could be performed using a large set of queries with their corresponding relevance assessments. However, such data are especially expensive to label, thus, as an alternative, we propose to rely on hyperlink data which convey analogous semantic relationships. We then empirically show that a measure sim inferred from hyperlinked documents can actually outperform the state-of-the-art Okapi approach, when applied over a non-hyperlinked retrieval corpus.