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From vahideh tabrizi <v.shinings...@gmail.com>
Subject Precision recall in lucene java
Date Wed, 31 Aug 2011 17:48:45 GMT
I want to use Lucene to calculate Precision and Recall. I did these steps:

1- made some index files. to do this I used indexer code and indexed txt
files which exist in this path "C:/inn" (there are 4 txt files in this
folder) and take them in "outt" folder by setting the indexpath to "C:/outt"
in the Indexer code.

2- then creat a package called lia.benchmark and a class inside it which is
called "PrecisionRecall" and add externaljars (rightclick>Java build path
>add external jars) and added Lucene-benchmark-.3.2.0jar and
Lucene-core-3.3.0jar

3- set the topicsfile path in code to"C:/lia2e/src/lia/benchmark/topics.txt"
and
qrelsfile to "C:/lia2e/src/lia/benchmark/qrels.txt" and dir to "C:/outt".
here is code:

package lia.benchmark;
import java.io.File; 
import java.io.PrintWriter;
import java.io.BufferedReader;   
import java.io.FileReader;   
import org.apache.lucene.search.*;   
import org.apache.lucene.store.*;   
import org.apache.lucene.benchmark.quality.*;   
import org.apache.lucene.benchmark.quality.utils.*;   
import org.apache.lucene.benchmark.quality.trec.*; 
 public class PrecisionRecall {
public static void main(String[] args) throws Throwable {      
File topicsFile = new File("C:/lia2e/src/lia/benchmark/topics.txt");        
File qrelsFile = new File("C:/lia2e/src/lia/benchmark/qrels.txt");        
Directory dir = FSDirectory.open(new File("C:/outt"));        
IndexSearcher 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();     
}   
}   
4- and initialized qrels and topics. in documents folder(C:\inn) I have 4
txt files which 2 of them is relevance to my query ( query is apple) so I
filled qrels and topics .

the qrels file like this:
<top> 
<num> Number: 0  
<title> apple 
<desc> Description:   
<narr> Narrative:   
</top>

and topics file like this:
  
0    0      789.txt           1 
0    0      101.txt           1 
 tried also the Path format namely for example "C:\inn\789.txt" instead of
"789.txt" but results are zero :

the resuluts are these:
0 - contents:apple 
0 Stats: 
Search Seconds: 0.016 
DocName Seconds: 0.000 
Num Points: 2.000 
Num Good Points: 0.000 
Max Good Points: 2.000 
Average Precision: 0.000 
MRR: 0.000 Recall: 0.000 
Precision At 1: 0.000 
SUMMARY Search Seconds: 0.016 
DocName Seconds: 0.000 
Num Points: 2.000 
Num Good Points: 0.000 
Max Good Points: 2.000 
Average Precision: 0.000 
MRR: 0.000 Recall: 0.000 
Precision At 1: 0.000 
 
can you tell me what is wrong with me? I really need to know why results are
zero. please help me. thanks in advanc.

vahideh


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