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Posted to issues@kylin.apache.org by "Zhong Yanghong (JIRA)" <ji...@apache.org> on 2018/03/21 05:39:00 UTC
[jira] [Created] (KYLIN-3306) Fix the rarely happened unit test
exception of generic algorithm
Zhong Yanghong created KYLIN-3306:
-------------------------------------
Summary: Fix the rarely happened unit test exception of generic algorithm
Key: KYLIN-3306
URL: https://issues.apache.org/jira/browse/KYLIN-3306
Project: Kylin
Issue Type: Bug
Reporter: Zhong Yanghong
Assignee: Zhong Yanghong
There's a bug in the following code:
{code}
private Chromosome rouletteWheel(final List<Chromosome> chromosomes, final double totalFitness) {
float rnd = (float) (GeneticAlgorithm.getRandomGenerator().nextDouble() * totalFitness);
float runningScore = 0;
for (Chromosome o : chromosomes) {
if (rnd >= runningScore && rnd <= runningScore + o.getFitness()) {
return o;
}
runningScore += o.getFitness();
}
return null;
}
{code}
We should use double instead of float.
For example, (float) (0.9999999988948809 * 40.510999999999996) = 40.511 > 40.510999999999996
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