On 11/30/10, Robert Muir <rcm...@gmail.com> wrote:
>
> Have a look at contrib/benchmark under the
> org.apache.lucene.benchmark.quality package.
> There is code (for example
> org.apache.lucene.benchmark.quality.trec.QueryDriver) that can run an
> experiment and output what you need for trec_eval.exe
> I think there is some additional documentation on how to use this in
> Lucene in Action 2.
>
> ---------------------------------------------------------------------
yes you're right.I just realize it.I did find the sample source code
of precision and recall in that ebook such as here.
public class PrecisionRecall {
public static void main(String[] args) throws Throwable {
File topicsFile = new
File("C:/Users/Raden/Documents/lucene/LuceneHibernate/adi/50.txt");
File qrelsFile = new
File("C:/Users/Raden/Documents/lucene/LuceneHibernate/adi/51.txt");
Directory dir = FSDirectory.open(new
File("C:/Users/Raden/Documents/lucene/LuceneHibernate/adi"));
Searcher searcher = new IndexSearcher(dir, true);
String docNameField = "filename";
PrintWriter logger = new PrintWriter(System.out, true);
TrecTopicsReader qReader = new TrecTopicsReader();
QualityQuery qqs[] = qReader.readQueries(new BufferedReader(
new FileReader(topicsFile)));
Judge judge = new TrecJudge(new BufferedReader(
new FileReader(qrelsFile)));
judge.validateData(qqs, logger);
QualityQueryParser qqParser = new SimpleQQParser(
"title", "contents");
QualityBenchmark qrun = new QualityBenchmark(qqs,
qqParser, searcher, docNameField);
SubmissionReport submitLog = null;
QualityStats stats[] = qrun.execute(judge,
submitLog, logger);
QualityStats avg =
QualityStats.average(stats);
avg.log("SUMMARY",2,logger, " ");
dir.close();
}
}
or in a more friendly format you can see it in this link
http://pastebin.ca/2006780
but when I run that code in lucene,the computation of precision and
recall that I get is zero.here is the result
WARNING: 5 judgments match no query! -
potentialities
an
on
the
and
SUMMARY
Search Seconds: 0.000
DocName Seconds: 0.000
Num Points: 0.000
Num Good Points: 0.000
Max Good Points: 0.000
Average Precision: 0.000
MRR: 0.000
Recall: 0.000
can you tell me what went wrong? what is the difference between
topicsFile and qrelsFile anyway?
thanks though. :-)
--
http://jacobian.web.id
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