Thanks, Jack!
On Fri, Jul 12, 2013 at 9:37 PM, Jack Krupansky <j...@basetechnology.com>wrote: > For the calculation of norm, see note number 6: > > http://lucene.apache.org/core/**4_3_0/core/org/apache/lucene/** > search/similarities/**TFIDFSimilarity.html<http://lucene.apache.org/core/4_3_0/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html> > > You would need to talk to the Nutch guys to see why THEY are setting > document boost to 0.0. > > > -- Jack Krupansky > > -----Original Message----- From: Joe Zhang > Sent: Friday, July 12, 2013 11:57 PM > To: solr-user@lucene.apache.org > Subject: Re: zero-valued retrieval scores > > > Yes, you are right, the boost on these documents are 0. I didn't provide > them, though. > > I suppose the boost scores come from Nutch (yes, my solr indexes crawled > web docs). What could be wrong? > > again, what exactly is the formula for fieldNorm? > > > On Fri, Jul 12, 2013 at 8:46 PM, Jack Krupansky <j...@basetechnology.com>* > *wrote: > > Did you put a boost of 0.0 on the documents, as opposed to the default of >> 1.0? >> >> x * 0.0 = 0.0 >> >> -- Jack Krupansky >> >> -----Original Message----- From: Joe Zhang >> Sent: Friday, July 12, 2013 10:31 PM >> To: solr-user@lucene.apache.org >> Subject: zero-valued retrieval scores >> >> >> when I search a keyword (such as "apple"), most of the docs carry 0.0 as >> score. Here is an example from explain: >> >> str name=" >> http://www.bloomberg.com/****slideshow/2013-07-12/world-at-** >> **work-india.html<http://www.bloomberg.com/**slideshow/2013-07-12/world-at-**work-india.html> >> <http://www.**bloomberg.com/slideshow/2013-** >> 07-12/world-at-work-india.html<http://www.bloomberg.com/slideshow/2013-07-12/world-at-work-india.html> >> **> >> >> "> >> 0.0 = (MATCH) fieldWeight(content:appl in 51), product of: >> 1.0 = tf(termFreq(content:appl)=1) >> 2.096877 = idf(docFreq=5190, maxDocs=15546) >> 0.0 = fieldNorm(field=content, doc=51) >> Can somebody help me understand why fieldNorm is 0? What exactly is the >> formula for computing fieldNorm? >> >> Thanks! >> >> >
