TREC 14 Enterprise Track at CSIRO and ANU

By the time of submission deadline, we completed two tasks: known-item search and discussion search. For both tasks, we used the PADRE retrieval system [1], in which the Okapi BM25 relevance function was implemented. Each message in the collection was treated as an independent document, so both topic distillation scoring and same site suppression mechanism were turned off (i.e. -nocool and –SSS0 respectively). During the indexing, stemming and stopword elimination were not applied and sequences of letters and/or digits were considered as indexable words.