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Declarative Machine Learning
/*
* 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.sysml.runtime.functionobjects;
public class Equals extends ValueComparisonFunction
{
private static final long serialVersionUID = -8887713112454357802L;
private static Equals singleObj = null;
private Equals() {
// nothing to do here
}
public static Equals getEqualsFnObject() {
if ( singleObj == null )
singleObj = new Equals();
return singleObj;
}
/*
* Arithmetic relational operators (==, !=, <=, >=) must be instead of
* Double.compare()
due to the inconsistencies in the way
* NaN and -0.0 are handled. The behavior of methods in
* Double
class are designed mainly to make Java
* collections work properly. For more details, see the help for
* Double.equals()
and Double.compareTo()
.
*/
/**
* execute() method that returns double is required since current map-reduce
* runtime can only produce matrices of doubles. This method is used on MR
* side to perform comparisons on matrices like A==B and A==2.5
*/
@Override
public double execute(double in1, double in2) {
return (in1 == in2 ? 1.0 : 0.0);
}
@Override
public boolean compare(double in1, double in2) {
return (in1 == in2);
}
@Override
public boolean compare(long in1, long in2) {
return (in1 == in2);
}
@Override
public boolean compare(boolean in1, boolean in2) {
return (in1 == in2);
}
@Override
public boolean compare(String in1, String in2) {
return ( in1!=null && in1.equals(in2) );
}
}