Thanks Masaru, so it is the precision loss issue by encoding/decoding. That makes sense.
On Friday, March 27, 2015 at 11:04:12 AM UTC+8, Masaru Hasegawa wrote: > > Hi, > > I believe it's because field norm is encoded in single byte. > See <http://lucene.apache.org/core/4_10_2/core/index.html> > http://lucene.apache.org/core/4_10_2/core/org/apache/lucene/search/similarities/DefaultSimilarity.html > > <http://lucene.apache.org/core/4_10_2/core/index.html> > > Masaru > > On March 26, 2015 at 14:36:45, Xudong You ([email protected] > <javascript:>) wrote: > > > Per this post "theory behind relevance scoring" > http://www.elastic.co/guide/en/elasticsearch/guide/current/scoring-theory.html > > Elasticsearch calculate the field-length norm as follows: > > norm(d) = 1 / √numTerms > > > But per my testing, seems the actual result value calculated does not meet > above formula. > > > Following is my index docs: > > > 1. > { > "title" : "quick brown fox" > } > > 2. > { > "title" : "quick fox" > } > > > Then I query "fox" with following query: > POST /vsmtest/test/_search?explain > { > "query" : { > "match" : {"title":"fox"} > } > } > > The result norm value are follows: > > doc 1: > { > "value": 0.5, > "description": "fieldNorm(doc=0)" > } > doc 2: > { > "value": 0.625, > "description": "fieldNorm(doc=0)" > } > > Can anyone help me understand how does 0.5 and 0.625 calculated per the > formula? > norm(d) = 1 / √numTerms > > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/11f6dcea-6704-4a56-93f7-21bf89840789%40googlegroups.com > > <https://groups.google.com/d/msgid/elasticsearch/11f6dcea-6704-4a56-93f7-21bf89840789%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/79aae199-a905-4d3c-a764-e0271b9874d9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
