Author: srowen
Date: Tue Aug 26 18:05:04 2008
New Revision: 689314
URL: http://svn.apache.org/viewvc?rev=689314&view=rev
Log:
Fixed definition of fall-out, again
Modified:
lucene/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/eval/GenericRecommenderIRStatsEvaluator.java
Modified:
lucene/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/eval/GenericRecommenderIRStatsEvaluator.java
URL:
http://svn.apache.org/viewvc/lucene/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/eval/GenericRecommenderIRStatsEvaluator.java?rev=689314&r1=689313&r2=689314&view=diff
==============================================================================
---
lucene/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/eval/GenericRecommenderIRStatsEvaluator.java
(original)
+++
lucene/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/eval/GenericRecommenderIRStatsEvaluator.java
Tue Aug 26 18:05:04 2008
@@ -83,6 +83,7 @@
throw new IllegalArgumentException("Invalid relevanceThreshold: " +
evaluationPercentage);
}
+ int numItems = dataModel.getNumItems();
RunningAverage precision = new FullRunningAverage();
RunningAverage recall = new FullRunningAverage();
RunningAverage fallOut = new FullRunningAverage();
@@ -131,7 +132,7 @@
recall.addDatum((double) intersectionSize / (double)
numRelevantItems);
if (numRelevantItems < prefs.length) {
fallOut.addDatum((double) (numRecommendedItems - intersectionSize)
/
- (double) (prefs.length - numRelevantItems));
+ (double) (numItems - numRelevantItems));
}
log.info("Precision/recall/fall-out: {} / {} / {}", new Object[] {
