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We participated in two tracks: Knowledge Base Acceleration (KBA) Track and Session Track. ... In the KBA track, we focused on experimenting with different approaches as it is the first time the track is launched. We experimented with supervised and unsupervised retrieval models. ... Table 1 : 1 nDCG at k of the CWI submission and median of TREC 2012 over all sessions Task CWI submission median TREC RL1 (prior) 0.2422 0.1746 RL2 (query upd.) 0.2529 0.1901 RL3 (RL upd.) 0.2313 0.2160 ...dblp:conf/trec/AraujoGHBV12 fatcat:xd4ruo7tbzf3lptz7x3jdhcbou