Chris Hostetter wrote: > > > : The DisjunctionMaxQuery seems to yield the maximum score only. From my > > NOTE: by setting the "tiebreaker" value of a DisjunctionMaxQuery to "1.0" > it generates the sum of the scores > > : understanding, I would > : need to do the following - > : (1) Create a new similarity function > : (2) Write a new Query class extension > : (3) Need to write a new linear function ?? > > you'll definitely need a new similarity class with a custom tf and > queryNorm function. I don't think you'd need a new QUewry class .. what > you are looking for should be fairly straight forward to impliment using > BooleanQueries, TermQueries, and FunctionQueries. You shouldn't need to > write a new linear function ValueSource -- i can't think of why the > current one wouldn't work for you. > > the [EMAIL PROTECTED] list is a good place to ask general questions about > customizing Scoring by writting your own Similarity, and it has a larger > user base then the solr lists. > > > > -Hoss > > >
Thanks Hoss. I have written the new similarity class. There are two problems with the existing linear function - (a) the input doesn't seem to be the score returned for the field by doing the similarity computation, but instead depends on the field data type. (b) Also, the function I want is a slight variation of the linear function. Essentially it is a step function, if term freq = 1, return a particular value and if term freq > 1, implement a linear function. But I think (a) is the bigger problem. For instance on this data set - - <doc> <str name="desc">ABCDE XYZ</str> <str name="id">40</str> <str name="name">abcde XYZ GHI</str> <float name="profile_score">55</float> </doc> - <doc> <str name="desc">ABCDE ABCDE XYZ</str> <str name="id">30</str> <str name="name">ABCDE XYZ GHI</str> <float name="profile_score">45</float> </doc> the following URL returns data - http://dev01:8983/solr/select/?qt=dismax&q=abcde+ghi&qf=name&bf=linear(id,1,10)&debugQuery=1 whereas http://dev01:8983/solr/select/?qt=dismax&q=abcde+ghi&qf=name&bf=linear(name,1,10)&debugQuery=1 throws a null pointer exception - java.lang.RuntimeException: there are more terms than documents in field "name", but it's impossible to sort on tokenized fields at org.apache.lucene.search.FieldCacheImpl.getStringIndex(FieldCacheImpl.java:274) at org.apache.solr.search.function.OrdFieldSource.getValues(OrdFieldSource.java:55) at org.apache.solr.search.function.LinearFloatFunction.getValues(LinearFloatFunction.java:49) at org.apache.solr.search.function.FunctionQuery$AllScorer.<init>(FunctionQuery.java:100) Once again, thanks for your help. -- View this message in context: http://www.nabble.com/Question-about-similarity-manipulation...-tf2910171.html#a8148415 Sent from the Solr - User mailing list archive at Nabble.com.
