IGNITE-13386 [ML]: Add new distances (BrayCurtis, Canberra, JensenShannon and etc) #8197
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| private final Double base; | ||
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| public JensenShannonDistance() { | ||
| base = null; |
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Could we add here the default value which could make sense?
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Add Math.E as default value because Math.log(Math.E) == 1 and js /= Math.log(Math.E) is equal to js /= 1
| import org.apache.ignite.ml.math.util.MatrixUtil; | ||
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| /** | ||
| * Calculates the JensenShannonDistance distance between two points. |
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Could you please add a link to the Wiki or paper or put the formula in pseudocode (will be useful for understanding)?
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Added link to wikipedia.
| import org.apache.ignite.ml.math.util.MatrixUtil; | ||
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| /** | ||
| * Calculates the Canberra distance between two points. |
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Could you please add a link to the Wiki or paper or put the formula in pseudocode (will be useful for understanding)?
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Added link to wikipedia.
| import org.apache.ignite.ml.math.util.MatrixUtil; | ||
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| /** | ||
| * Calculates the Bray Curtis distance between two points. |
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Could you please add a link to the Wiki or paper or put the formula in pseudocode (will be useful for understanding)?
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Added link to wikipedia.
| import static org.junit.Assert.assertEquals; | ||
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| @RunWith(Parameterized.class) | ||
| public class BrayCurtisDistanceTest { |
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Add comment like
/**
* Evaluate BrayCurtisDistance in multiple test datasets
*/
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| private final TestData testData; | ||
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| public CanberraDistanceTest(TestData testData) { |
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/** */
| new BrayCurtisDistance(), | ||
| new CanberraDistance(), | ||
| new JensenShannonDistance(), | ||
| new WeightedMinkowskiDistance(4, new DenseVector(new double[]{1, 1, 1})), |
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Maybe these parameters could become default?
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We can set default value for p (power) parameter as 2, but weight can not be default because weight's is dimensional dependent. If we want to evaluate distance between d(a,b), then a.size() == b.size() && a.size() == weight.size().
Or I can use null for weight and use them only when weight != null.
| import static org.junit.Assert.assertEquals; | ||
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| @RunWith(Parameterized.class) | ||
| public class JensenShannonDistanceTest { |
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/** */
| import static org.junit.Assert.assertEquals; | ||
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| @RunWith(Parameterized.class) | ||
| public class WeightedMinkowskiDistanceTest { |
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/** */
| } | ||
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| @Test | ||
| public void test() { |
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change the test name to test+, because it could create problems with next migration to next versions of JUNIt framework
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I renamed my tests like test<distanceName.
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add distances
Issue: https://issues.apache.org/jira/browse/IGNITE-13386