Hi Oliver, I would like to add a couple of things here.. 1. Regarding lengthNorm being called you will also have to make sure that you set your custom similarity class during index by calling IndexWriterConfig.setSimilarity(new CustomSimilarity());
2. From what I can see in the source for computeNorm basically calls fieldNorm and encodes it so that it can be stored in the index On Thu, Jun 13, 2013 at 6:24 AM, Oliver Xu (Aigine Co) <oliver...@aigine.com > wrote: > 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 > > -- Regards, Varun Thacker http://www.vthacker.in/
