An Interactive Two-Dimensional Approach to Query Aspects Rewriting in Systematic Reviews. IMS Unipd At CLEF eHealth Task 2

In this paper, we describe the participation of the Information Management Systems (IMS) group at CLEF eHealth 2017 Task 2. This task focuses on the problem of systematic reviews, that is articles that summarise all evidence that is published regarding a certain medical topic. This task, known in Information Retrieval as the total recall problem, requires long and tedious search sessions by experts in the field of medicine. Automatic (or semi-automatic) approaches are essential to support these type of searches when the amount of data exceed the limits of users, i.e. in terms of attention or patience. We present the two-dimensional probabilistic version of BM25 with explicit relevance feedback together with a query aspect rewriting approach for both the simple evaluation and the cost-effective evaluation.