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Declarative Machine Learning
/*
* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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*/
package org.apache.sysml.runtime.instructions.spark.functions;
import org.apache.spark.api.java.function.Function2;
import org.apache.sysml.runtime.DMLRuntimeException;
import org.apache.sysml.runtime.functionobjects.CM;
import org.apache.sysml.runtime.functionobjects.KahanPlus;
import org.apache.sysml.runtime.instructions.cp.CM_COV_Object;
import org.apache.sysml.runtime.instructions.cp.KahanObject;
import org.apache.sysml.runtime.matrix.data.WeightedCell;
import org.apache.sysml.runtime.matrix.operators.AggregateOperator;
import org.apache.sysml.runtime.matrix.operators.CMOperator;
import org.apache.sysml.runtime.matrix.operators.Operator;
public class PerformGroupByAggInCombiner implements Function2 {
private static final long serialVersionUID = -813530414567786509L;
private Operator _op;
public PerformGroupByAggInCombiner(Operator op) {
_op = op;
}
@Override
public WeightedCell call(WeightedCell value1, WeightedCell value2)
throws Exception
{
WeightedCell outCell = new WeightedCell();
CM_COV_Object cmObj = new CM_COV_Object();
if(_op instanceof CMOperator) //everything except sum
{
if( ((CMOperator) _op).isPartialAggregateOperator() )
{
cmObj.reset();
CM lcmFn = CM.getCMFnObject(((CMOperator) _op).aggOpType); // cmFn.get(key.getTag());
//partial aggregate cm operator
lcmFn.execute(cmObj, value1.getValue(), value1.getWeight());
lcmFn.execute(cmObj, value2.getValue(), value2.getWeight());
outCell.setValue(cmObj.getRequiredPartialResult(_op));
outCell.setWeight(cmObj.getWeight());
}
else //forward tuples to reducer
{
throw new DMLRuntimeException("Incorrect usage, should have used PerformGroupByAggInReducer");
}
}
else if(_op instanceof AggregateOperator) //sum
{
AggregateOperator aggop=(AggregateOperator) _op;
if( aggop.correctionExists ) {
KahanObject buffer=new KahanObject(aggop.initialValue, 0);
KahanPlus.getKahanPlusFnObject();
//partial aggregate with correction
aggop.increOp.fn.execute(buffer, value1.getValue()*value1.getWeight());
aggop.increOp.fn.execute(buffer, value2.getValue()*value2.getWeight());
outCell.setValue(buffer._sum);
outCell.setWeight(1);
}
else //no correction
{
double v = aggop.initialValue;
//partial aggregate without correction
v=aggop.increOp.fn.execute(v, value1.getValue()*value1.getWeight());
v=aggop.increOp.fn.execute(v, value2.getValue()*value2.getWeight());
outCell.setValue(v);
outCell.setWeight(1);
}
}
else
throw new DMLRuntimeException("Unsupported operator in grouped aggregate instruction:" + _op);
return outCell;
}
}