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From Robert Muir <rcm...@gmail.com>
Subject Re: Lucene 4.0 benchmark bug?
Date Wed, 17 Oct 2012 14:58:12 GMT
On Wed, Oct 17, 2012 at 6:48 AM, Zeynep P. <zpvie@yahoo.com> wrote:
>
> My index is created by lucene 3.6.

> Second problem, for the same collection MAP = 0.17 with default similarity,
> MAP= 0.07 with lucene 4.0 BM25 similarity (b=0.75, k1=1.2).

Did you read CHANGES.txt before doing this? This is really important to do.

Note: most of the models do rely upon index statistics that are new in
Lucene 4.0, so
for existing 3.x indexes its a good idea to upgrade your index to the
new format with IndexUpgrader first.

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