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2014 Mar 22
2
[GSOC 2014] Indexing INEX dataset
For unsupervised approaches like BM25 this approach works well but letor
does not need special weighting for title in this form as it itself assigns
weights to title features separately.
But I see your concern it would be a problem when BM25 is used on the index
with this setup. Hence its preferable to take a note of this uplift in
title weight for xapian-letor and normalize it everywhere