| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.sysds.runtime.functionobjects; |
| |
| import java.io.Serializable; |
| |
| import org.apache.sysds.runtime.instructions.cp.Data; |
| import org.apache.sysds.runtime.instructions.cp.KahanObject; |
| |
| |
| /** |
| * Runtime function to perform the summation of squared values using |
| * the Kahan summation algorithm. |
| */ |
| public class KahanPlusSq extends KahanFunction implements Serializable { |
| |
| private static final long serialVersionUID = 5774388904472231717L; |
| |
| private static KahanPlusSq singleObj = null; |
| private KahanPlus kplus = null; |
| |
| private KahanPlusSq() { |
| kplus = KahanPlus.getKahanPlusFnObject(); |
| } |
| |
| /** |
| * Get the KahanPlusSq singleton object. |
| * |
| * @return KahanPlusSq singleton object |
| */ |
| public static KahanPlusSq getKahanPlusSqFnObject() { |
| if (singleObj == null) |
| singleObj = new KahanPlusSq(); |
| return singleObj; |
| } |
| |
| /** |
| * Square the given term, then add to the existing sum using |
| * the Kahan summation algorithm. |
| * |
| * @param kObj A KahanObject supplied as a Data type containing |
| * the current sum and correction factor for the |
| * Kahan summation algorithm. |
| * @param in The current term to be squared and added. |
| */ |
| @Override |
| public Data execute(Data kObj, double in) { |
| kplus.execute(kObj, in * in); |
| return kObj; |
| } |
| |
| /** |
| * Add the given sum and correction factor to the existing |
| * sum in the KahanObject using the Kahan summation algorithm. |
| * |
| * @param kObj A KahanObject supplied as a Data type containing |
| * the current sum and correction factor for the |
| * Kahan summation algorithm. |
| * @param sum The current sum. |
| * @param corr The current correction factor. |
| */ |
| @Override |
| public Data execute(Data kObj, double sum, double corr) { |
| kplus.execute(kObj, sum, corr); |
| return kObj; |
| } |
| |
| @Override |
| public void execute2(KahanObject kObj, double in) { |
| kplus.execute2(kObj, in * in); |
| } |
| |
| @Override |
| public void execute3(KahanObject kObj, double in, int count) { |
| kplus.execute3(kObj, in * in, count); |
| } |
| } |