Boosting by convention is "flat" at 1.0. Usually people boost with numbers like 3 or 5 or 20.
On Wed, Mar 3, 2010 at 6:34 PM, Jianbin Dai <j...@huawei.com> wrote: > Hi Erick, > > Each doc contains some keywords that are indexed. However each keyword is > associated with a weight to represent its importance. In my example, > D1: fruit 0.8, apple 0.4, banana 0.2 > > The keyword fruit is the most important keyword, which means I really really > want it to be matched in a search result, but banana is less important (It > would be good to be matched though). > > Hope that explains. > > Thanks. > > JB > > > > -----Original Message----- > From: Erick Erickson [mailto:erickerick...@gmail.com] > Sent: Wednesday, March 03, 2010 6:23 PM > To: solr-user@lucene.apache.org > Subject: Re: weighted search and index > > Then I'm totally lost as to what you're trying to accomplish. Perhaps > a higher-level statement of the problem would help. > > Because no matter how often I look at your point <2>, I don't see > what relevance the numbers have if you're not using them to > boost at index time. Why are they even there? > > Erick > > On Wed, Mar 3, 2010 at 8:54 PM, Jianbin Dai <j...@huawei.com> wrote: > >> Thank you very much Erick! >> >> 1. I used boost in search, but I don't know exactly what's the best way to >> boost, for such as Sports 0.8, golf 0.5 in my example, would it be >> sports^0.8 AND golf^0.5 ? >> >> >> 2. I cannot use boost in indexing. Because the weight of the value > changes, >> not the field, look at this example again, >> >> C1: fruit 0.8, apple 0.4, banana 0.2 >> C2: music 0.9, pop song 0.6, Britney Spears 0.4 >> >> There is no good way to boost it during indexing. >> >> Thanks. >> >> JB >> >> >> -----Original Message----- >> From: Erick Erickson [mailto:erickerick...@gmail.com] >> Sent: Wednesday, March 03, 2010 5:45 PM >> To: solr-user@lucene.apache.org >> Subject: Re: weighted search and index >> >> You have to provide some more details to get meaningful help. >> >> You say "I was trying to use boosting". How? At index time? >> Search time? Both? Can you provide some code snippets? >> What does your schema look like for the relevant field(s)? >> >> You say "but seems not working right". What does that mean? No hits? >> Hits not ordered as you expect? Have you tried putting "&debugQuery=on" on >> your URL and examined the return values? >> >> Have you looked at your index with the admin page and/or Luke to see if >> the data in the index is as you expect? >> >> As far as I know, boosts are multiplicative. So boosting by a value less >> than >> 1 will actually decrease the ranking. But see the Lucene scoring, See: >> >> > http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/search/Similarity. >> > html<http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/search/Simila > rity.%0Ahtml> >> >> And remember, that boosting will *tend* to move a hit up or down in the >> ranking, not position it absolutely. >> >> HTH >> Erick >> >> On Wed, Mar 3, 2010 at 8:13 PM, Jianbin Dai <j...@huawei.com> wrote: >> >> > Hi, >> > >> > I am trying to use solr for a content match application. >> > >> > A content is described by a set of keywords with weights associated, > eg., >> > >> > C1: fruit 0.8, apple 0.4, banana 0.2 >> > C2: music 0.9, pop song 0.6, Britney Spears 0.4 >> > >> > Those contents would be indexed in solr. >> > In the search, I also have a set of keywords with weights: >> > >> > Query: Sports 0.8, golf 0.5 >> > >> > I am trying to find the closest matching contents for this query. >> > >> > My question is how to index the contents with weighted scores, and how > to >> > write search query. I was trying to use boosting, but seems not working >> > right. >> > >> > Thanks. >> > >> > Jianbin >> > >> > >> > >> >> > > -- Lance Norskog goks...@gmail.com
