Mikhail, Thank you for your reply.
Even though the long is returned from this function, it is always encoded as a single byte lossy representation. In order to change that and add other norms (for using other similarity functions on the same indexed data), there should be a support for multiple norms. Imagine using two similarities side-by-side - a default and an LMSimilarity with discountOverlaps set to false, or trying a different doc length normalization where the length shouldn't be a reciprocal square root function like in the DefaultSimilarity. The only way of doing it, is to have the multiple norms stored. Here is the LUCENE-3687 Description: "This removes the long standing limitation that norms are a single byte. Yet, we still need to expose this functionality to Similarity to write / encode norms in a different format." I am wondering if there is a plan to roll this into a release. Thanks, Ivan On Saturday, October 3, 2015 11:04 PM, Mikhail Khludnev <mkhlud...@griddynamics.com> wrote: Hello, Norms can be long, see org.apache.lucene.search.similarities.TFIDFSimilarity.encodeNormValue(float) /** Encodes a normalization factor for storage in an index. */ public abstract long encodeNormValue(float f); On Sun, Oct 4, 2015 at 6:39 AM, Ivan Provalov <iprov...@yahoo.com.invalid> wrote: When does this 4.0-ALPHA feature going to be included in the released version? >https://issues.apache.org/jira/browse/LUCENE-3687 >It's the "Allow similarity to encode norms other than a single byte". > > >I thought that it would be in the released versions, but it looks like it's >only on 4.0-alpha. I am using 4.6.1, but also looked in 5.3.1 source, none of >these include the changes. > > >With these changes, the new API in the sim class is accepting the norms, like >so: computeNorm(FieldInvertState state, Norm norm). > > >Thank you, > > >Ivan Provalov -- Sincerely yours Mikhail Khludnev Principal Engineer, Grid Dynamics --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org
