1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.math4.legacy.ml.distance; 18 19 import org.junit.Assert; 20 import org.junit.Test; 21 22 /** 23 * Tests for {@link EarthMoversDistance} class. 24 */ 25 public class EarthMoversDistanceTest { 26 27 private final DistanceMeasure distance = new EarthMoversDistance(); 28 private final double[] a = { 0.1, 0.3, 0.2, 0.0, 0.25, 0.15 }; 29 private final double[] b = { 0.3, 0.0, 0.4, 0.1, 0.0, 0.2 }; 30 31 @Test 32 public void testZero() { 33 Assert.assertEquals(0, distance.compute(a, a), 0d); 34 } 35 36 @Test 37 public void testZero2() { 38 final double[] zero = new double[] { 0, 0 }; 39 Assert.assertEquals(0, distance.compute(zero, zero), 0d); 40 } 41 42 @Test 43 public void test() { 44 double expected = 0.65; //0.2 + 0.1 + 0.1 + 0.2 + 0.05 + 0.0; 45 Assert.assertEquals(expected, distance.compute(a, b), 1e-10); 46 Assert.assertEquals(expected, distance.compute(b, a), 1e-10); 47 } 48 }