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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.matrix.data;
import org.apache.sysml.api.DMLException;
import org.apache.sysml.runtime.util.UtilFunctions;
public class BinaryBlockToRowBlockConverter implements Converter
{
private MatrixBlock _srcBlock = null;
private int _srcRlen = -1;
private int _srcBrlen = -1;
private int _pos = -1;
private long _startRowID = -1;
private long _colID = -1;
//output blocks for reuse
private MatrixIndexes _destIx = null;
private MatrixBlock _destBlock = null;
private Pair _pair = null;
public BinaryBlockToRowBlockConverter()
{
_destIx = new MatrixIndexes();
_destBlock = new MatrixBlock();
_pair=new Pair(_destIx, _destBlock);
}
private void reset()
{
_srcBlock = null;
_pos = -1;
_startRowID =-1;
_colID = -1;
}
@Override
public void convert(MatrixIndexes k1, MatrixBlock v1) {
reset();
_startRowID = UtilFunctions.cellIndexCalculation(k1.getRowIndex(), _srcBrlen, 0);
_colID = k1.getColumnIndex();
_destBlock.reset(1, v1.getNumColumns());
_srcRlen = v1.getNumRows();
_srcBlock = v1;
_pos = 0;
}
@Override
public boolean hasNext()
{
//reached end of block
if( _pos >= _srcRlen )
return false;
return true;
}
@Override
public Pair next()
{
//check for valid next call
if( _pos >= _srcRlen )
return null;
//prepare partial rowblock key
_destIx.setIndexes(_startRowID+_pos, _colID);
//slice next row
try {
//rowlow, rowup, collow, colup (1-based specification)
_srcBlock.sliceOperations( _pos, _pos, 0, _srcBlock.getNumColumns()-1, _destBlock );
}
catch(DMLException ex)
{
throw new RuntimeException("Failed to slice matrix block into row blocks.", ex);
}
//increment current pos
_pos++;
return _pair;
}
@Override
public void setBlockSize(int nr, int nc) {
_srcBrlen = nr;
}
}