Robert Jäschke created MAHOUT-1015:
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Summary: Precondition check in IRStatisticsImpl broken
Key: MAHOUT-1015
URL: https://issues.apache.org/jira/browse/MAHOUT-1015
Project: Mahout
Issue Type: Bug
Components: Collaborative Filtering
Affects Versions: 1.0
Reporter: Robert Jäschke
Assignee: Sean Owen
Priority: Minor
The precondition check in the constructor of
org.apache.mahout.cf.taste.impl.eval.IRStatisticsImpl includes Copy&Paste
errors:
Preconditions.checkArgument(fallOut >= 0.0 && fallOut <= 1.0, "Illegal fallOut:
" + fallOut);
Preconditions.checkArgument(fallOut >= 0.0 && fallOut <= 1.0, "Illegal nDCG: "
+ ndcg);
Preconditions.checkArgument(reach >= 0.0 && reach <= 1.0, "Illegal reach: " +
ndcg);
The second line shows a message for nDCG but checks the fallOut, the third line
checks the reach but prints out the nDCG.
This error is also in the current version from the SVN
(http://svn.apache.org/viewvc/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/eval/IRStatisticsImpl.java?revision=1213930&view=markup)
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