Lovely. Thank you very much! Oliver -----邮件原件----- 发件人: java-user-return-56101-oliver.xu=aigine....@lucene.apache.org [mailto:java-user-return-56101-oliver.xu=aigine....@lucene.apache.org] 代表 Koji Sekiguchi 发送时间: 2013年6月12日 22:47 收件人: java-user@lucene.apache.org 主题: [SPAM] Re: A Problem in Customizing DefaultSimilarity
Hi Oliver, > My questions are: > > 1. Why are the overrided lengthNorm() (under Lucene410) or > computeNorm() (under Lucene350) methods not called during a searching > process? Regardless of whether you override the method or not, Lucene framework calls the method during index time only because length norm can be calculated by using the number of tokens in the field, i.e. not need to call it search time. > 2. How and where is fieldNorm calculated? I think fieldNorm = lengthNorm * boost of the field. Please see Javadoc for more detail: http://lucene.apache.org/core/4_3_0/core/org/apache/lucene/search/similariti es/TFIDFSimilarity.html koji -- http://soleami.com/blog/automatically-acquiring-synonym-knowledge-from-wikip edia.html --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
