Java tutorial
/* * Copyright (C) 2015 Seoul National University * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package edu.snu.dolphin.bsp.examples.ml.data; import org.apache.mahout.math.Vector; import javax.inject.Inject; /** * Implements DistanceMeasure (Default). */ public final class EuclideanDistance implements VectorDistanceMeasure { @Inject public EuclideanDistance() { } @Override public double distance(final Vector v1, final Vector v2) { if (v1.size() != v2.size()) { throw new IllegalArgumentException("Vector dimensions are not consistent"); } double distance = 0; for (int i = 0; i < v1.size(); i++) { distance += (v1.get(i) - v2.get(i)) * (v1.get(i) - v2.get(i)); } return Math.sqrt(distance); } }