Thank you both! Erick,
what you said was absolutely correct. I missunderstood the definition completely. Now it works as intended. Thank you! Kind regards Erick Erickson wrote: > > from: > http://wiki.apache.org/solr/DisMaxQParserPlugin#mm_.28Minimum_.27Should.27_Match.29 > "If there are less than 3 optional clauses, they all must match; for 3 to > 5 > clauses, one less than the number of clauses must match, for 6 or more > clauses, 80% must match, rounded down: "2<-1 5<80%"" > > Personally, the mm parameter makes my head hurt. > As I read it, there are actually 4 buckets that rules apply to, not three > in your mm definition, see below. > > > Your mm param says, I think, that > > clauses number rule > required > 1 1 We haven't gotten to a rule yet, this is the > default > 2 2 We haven't gotten to a rule yet, this is the > default > > 3 2 2<-1 > 4 3 2<-1 > > 5 2 4<50% rounded down > > 6 3 5<66% (6 * 0.66 = 3.96) > 7 4 5<66% rounded down > > Personally, I think the percentages are mind warping and lead to > "interesting" behavior. I prefer to explicitly list the number of causes > required or relatively constant numbers of required clauses, something > like "between 3 and 5, one less. 6 to 9 two less" etc. you don't get > weird steps like between 4 and 5 above. Plus, by the time you get to, > say, 7 clauses nobody can keep track of what correct behavior is anyway > <G>. > > So I think you're off by one position when applying your rules. Or the > Wiki > page is misleading. Or the Wiki page is exactly correct and I'm > mis-reading > it. > Like I said, mm makes my head hurt. > > Best > Erick > > > On Fri, Dec 3, 2010 at 8:18 AM, Em <mailformailingli...@yahoo.de> wrote: > >> >> Hi list, >> >> I got a little problem with my mm definition: >> >> 2<-1 4<50% 5<66% >> >> Here is what it *should* mean: >> >> If there are 2 clauses, at least one has to match. >> If there are more than 2 clauses, at least 50% should match (both rules >> seem >> to mean the same, don't they?). >> And if there are 5 or more than 5 claues, at least 66% should match. >> >> In case of 5 clauses, 3 should match, in case of 6 at least 4 should >> match >> and so on. >> >> However in some test-case I get only the intended behaviour with a >> 2-clause-query when I say mm=1. >> If I got longer queries this would lead to very bad >> search-quality-results. >> >> What is wrong with this mm-definition? >> >> Thanks for suggestions. >> - Em >> -- >> View this message in context: >> http://lucene.472066.n3.nabble.com/Problem-with-dismax-mm-tp2011496p2011496.html >> Sent from the Solr - User mailing list archive at Nabble.com. >> > > -- View this message in context: http://lucene.472066.n3.nabble.com/Problem-with-dismax-mm-tp2011496p2012079.html Sent from the Solr - User mailing list archive at Nabble.com.
