Bug in Auc computation
----------------------
Key: MAHOUT-557
URL: https://issues.apache.org/jira/browse/MAHOUT-557
Project: Mahout
Issue Type: Bug
Components: Classification
Affects Versions: 0.4
Reporter: Ted Dunning
Fix For: 0.5
>From Anil:
Another bug: in Auc.java
Classifier Evaluation :
when the scores are tied -
...
{quote}
// how many negatives are tied?
int k0 = 0;
while (i0 < n0 && v0 == tieScore) {
k0++;
i0++;
v0 = scores[0].get(i0);
}
// and how many positives
int k1 = 0;
while (i1 < n1 && v1 == tieScore) {
k1++;
i1++;
v1 = scores[1].get(i1);
}
{quote}
It sometimes goes Index out of bounds: Increment operation should be after
accessing it
{quote}
while (i0 < n0 && v0 == tieScore) {
v0 = scores[0].get(i0);
k0++;
i0++;
}
// and how many positives
int k1 = 0;
while (i1 < n1 && v1 == tieScore) {
v1 = scores[1].get(i1);
k1++;
i1++;
}
{quote}
Verily, he speaks truth.
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