DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG RELATED COMMENTS THROUGH THE WEB INTERFACE AVAILABLE AT <http://issues.apache.org/bugzilla/show_bug.cgi?id=31882>. ANY REPLY MADE TO THIS MESSAGE WILL NOT BE COLLECTED AND INSERTED IN THE BUG DATABASE.
http://issues.apache.org/bugzilla/show_bug.cgi?id=31882 [PATCH] FuzzyTermEnum optimization and refactor Summary: [PATCH] FuzzyTermEnum optimization and refactor Product: Lucene Version: CVS Nightly - Specify date in submission Platform: All OS/Version: All Status: NEW Severity: Enhancement Priority: Other Component: Search AssignedTo: [EMAIL PROTECTED] ReportedBy: [EMAIL PROTECTED] I took a look at it to see if it could be improved. I saw speed improvements of 20% - 40% by making a couple changes. The patch is here: http://www.hagerfamily.com/patches/FuzzyTermEnumOptimizePatch.txt The Patch is based on the HEAD of the CVS tree as of Oct 22, 2004. What Changed? Since the word was discarded if the edit distance for the word was above a certain threshold, I updated the distance algorithm to abort if at any time during the calculation it is determined that the best possible outcome of the edit distance algorithm is above this threshold. The source code has a great explanation. I also reduced the amount of floating point math, reduced the amount of potential space the array takes in its first dimension, removed the potential divide by 0 error when one term is an empty string, and fixed a bug where an IllegalArgumentException was thrown if the class was somehow initialized wrong, instead of looking at the arguments. The behavior is almost identical. The exception is that similarity is set to 0.0 when it is guaranteed to be below the minimum similarity. Results I saw the biggest improvement from longer words, which makes a sense. My long word was "bridgetown" and I saw a 60% improvement on this. The biggest improvement are for words that are farthest away from the median length of the words in the index. Short words (1-3 characters) saw a 30% improvement. Medium words saw a 10% improvement (5-7 characters). These improvements are with the prefix set to 0. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
