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Posted to solr-user@lucene.apache.org by Jonathan Acheson <gs...@gmail.com> on 2011/08/11 23:27:33 UTC
Why is "boost" not always listed in explain when debug is on?
using Solr Specification Version: 4.0.0.2011.08.09.11.02.13
While trying understand scoring I noticed that "boost" is intermittently
displayed in the explain. For example, using edismax and the query string is
"q=Starbucks&qf=name.search name^2" my first result has the boost explicitly
listed in the explain as "2.0=boost". When I change the boost to 20,
however, I no longer see the boost listed. Should "boost" be displayed in
both cases? Any help understanding this behavior would be greatly
appreciated. Thanks!
Boost of 2 ----------------------------------------------------------------
f278968e-b2c6-4bbd-8e69-85ab938fa554: "
8.609146 = (MATCH) max of:
8.609146 = (MATCH) weight(name:starbucks^2.0 in 163) [DefaultSimilarity],
result of:
8.609146 = score(doc=163,freq=1.0 = termFreq=1
), product of:
0.99999994 = queryWeight, product of:
2.0 = boost
8.609147 = idf(docFreq=8644, maxDocs=17433139)
0.05807776 = queryNorm
8.609147 = fieldWeight in 163, product of:
1.0 = tf(freq=1.0), with freq of:
1.0 = termFreq=1
8.609147 = idf(docFreq=8644, maxDocs=17433139)
1.0 = fieldNorm(doc=163)
4.278918 = (MATCH) weight(name.search:starbuck in 163)
[DefaultSimilarity], result of:
4.278918 = score(doc=163,freq=1.0 = termFreq=1
), product of:
0.49850774 = queryWeight, product of:
8.583453 = idf(docFreq=8869, maxDocs=17433139)
0.05807776 = queryNorm
8.583453 = fieldWeight in 163, product of:
1.0 = tf(freq=1.0), with freq of:
1.0 = termFreq=1
8.583453 = idf(docFreq=8869, maxDocs=17433139)
1.0 = fieldNorm(doc=163)
"
Boost of 20 ----------------------------------------------------------------
f278968e-b2c6-4bbd-8e69-85ab938fa554: "
8.609147 = (MATCH) max of:
8.609147 = (MATCH) weight(name:starbucks^20.0 in 163) [DefaultSimilarity],
result of:
8.609147 = fieldWeight in 163, product of:
1.0 = tf(freq=1.0), with freq of:
1.0 = termFreq=1
8.609147 = idf(docFreq=8644, maxDocs=17433139)
1.0 = fieldNorm(doc=163)
0.42789182 = (MATCH) weight(name.search:starbuck in 163)
[DefaultSimilarity], result of:
0.42789182 = score(doc=163,freq=1.0 = termFreq=1
), product of:
0.049850777 = queryWeight, product of:
8.583453 = idf(docFreq=8869, maxDocs=17433139)
0.0058077765 = queryNorm
8.583453 = fieldWeight in 163, product of:
1.0 = tf(freq=1.0), with freq of:
1.0 = termFreq=1
8.583453 = idf(docFreq=8869, maxDocs=17433139)
1.0 = fieldNorm(doc=163)
"
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Re: Why is "boost" not always listed in explain when debug is on?
Posted by Chris Hostetter <ho...@fucit.org>.
: using Solr Specification Version: 4.0.0.2011.08.09.11.02.13
:
: While trying understand scoring I noticed that "boost" is intermittently
: displayed in the explain. For example, using edismax and the query string is
Hmmm... that output is strange. it's not just the "boost" that's missing,
all of the details about the "queryWeight part of the score
from the "name:starbucks" clause are missing (and only the "fieldWeight")
is listed...
: 8.609147 = (MATCH) weight(name:starbucks^20.0 in 163) [DefaultSimilarity],
: result of:
: 8.609147 = fieldWeight in 163, product of:
: 1.0 = tf(freq=1.0), with freq of:
: 1.0 = termFreq=1
: 8.609147 = idf(docFreq=8644, maxDocs=17433139)
: 1.0 = fieldNorm(doc=163)
...i honestly have no idea what would cause that ... my best guess is that
maybe with the boost thta high the queryWeight winds up being "1.0" and
the score Explanation code leaves it out since it doesn't affect things?
-Hoss