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Declarative Machine Learning

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/*
 * 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.matrix.sort;

import java.io.IOException;

import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;

import org.apache.sysml.runtime.matrix.SortMR;
import org.apache.sysml.runtime.matrix.data.MatrixBlock;
import org.apache.sysml.runtime.matrix.data.MatrixIndexes;
import org.apache.sysml.runtime.matrix.mapred.MRJobConfiguration;

public class IndexSortMapper extends MapReduceBase 
   implements Mapper
{
		
	  private int _brlen = -1;
	  
	  //reuse writables
	  private LongWritable   _tmpLong = new LongWritable();
	  private IndexSortComparable _tmpSortKey = null;
		
	  @Override
	  public void map(MatrixIndexes key, MatrixBlock value, OutputCollector out, Reporter reporter) 
        throws IOException 
	  {
		  if( value.getNumColumns()>1 )
			  throw new IOException("IndexSort only supports column vectors, but found matrix block with clen="+value.getNumColumns());
		  
		  long row_offset = (key.getRowIndex()-1)*_brlen+1;
		  for( int i=0; i