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https://issues.apache.org/jira/browse/IGNITE-11655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anton Dmitriev updated IGNITE-11655:
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Affects Version/s: 2.7
> ML: OneHotEncoder returns more columns than expected
> ----------------------------------------------------
>
> Key: IGNITE-11655
> URL: https://issues.apache.org/jira/browse/IGNITE-11655
> Project: Ignite
> Issue Type: Bug
> Components: ml
> Affects Versions: 2.7
> Reporter: Anton Dmitriev
> Priority: Major
>
> OneHotEncoder returns more columns than expected (two values that might be
> encoded using two columns encoded using 3 columns). The following example
> demonstrates the problem:
> Map<Integer, Object[]> training = new HashMap<>();
> training.put(0, new Object[]{42.0});
> training.put(1, new Object[]{43.0});
> training.put(2, new Object[]{42.0});
> EncoderTrainer<Integer, Object[]> trainer = new
> EncoderTrainer<Integer, Object[]>()
> .withEncoderType(EncoderType.ONE_HOT_ENCODER)
> .withEncodedFeature(0);
> IgniteBiFunction<Integer, Object[], Vector> processor =
> trainer.fit(training, 1, (k, v) -> v);
> Vector res = processor.apply(1, new Object[]{42.0});
> System.out.println(Arrays.toString(res.asArray()));
> >>> [0.0, 1.0, 0.0]
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