Vic Bancroft wrote on 10/17/2006 02:44 AM:
In some of my group's usage of lucene over large document collections,
we have split the documents across several machines. This has lead to
a concern of whether the inverse document frequency was appropriate,
since the score seems to be dependant on the partioning of documents
over indexing hosts. We have not formulated an experiment to
determine if it seriously effects our results, though it has been
discussed.
What version of Lucene are you using? Are you using
ParallelMultiSearcher to manage the distributed indexes or have you
implemented your own mechanism? There was a bug a couple years ago, in
the 1.4.3 version as I recall, where ParallelMultiSearcher was not
computing df's appropriately, but that has been fixed for a long time
now. The df's are the sum of the df's from each distributed index and
thus are independent of the partitioning.
Chuck
7 messages in org.apache.lucene.java-devRe: Include BM25 in Lucene?
