Alternative Term Weighting - Ian Barber

Courtesy Planet PHP  Fri, 11/06/2009 - 15:50

Weights The term weighting and ranking function is at the core of any information retrieval system.

The vector space model with the cosine similarity is maybe the best known and most widely used, but there are plenty of alternatives.

We're looking at two here, the BM25 function based around a probabilistic model, and a function based around language modeling.

Just to get something to work with we'll we'll build a quick index on some strings which will stand in...

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