org.apache.sysml.runtime.instructions.spark.functions.ReplicateVectorFunction.java Source code

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Here is the source code for org.apache.sysml.runtime.instructions.spark.functions.ReplicateVectorFunction.java

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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.instructions.spark.functions;

import java.util.ArrayList;
import java.util.Iterator;

import org.apache.spark.api.java.function.PairFlatMapFunction;

import scala.Tuple2;

import org.apache.sysml.runtime.matrix.data.MatrixBlock;
import org.apache.sysml.runtime.matrix.data.MatrixIndexes;

public class ReplicateVectorFunction
        implements PairFlatMapFunction<Tuple2<MatrixIndexes, MatrixBlock>, MatrixIndexes, MatrixBlock> {

    private static final long serialVersionUID = -1505557561471236851L;

    private boolean _byRow;
    private long _numReplicas;

    public ReplicateVectorFunction(boolean byRow, long numReplicas) {
        _byRow = byRow;
        _numReplicas = numReplicas;
    }

    @Override
    public Iterator<Tuple2<MatrixIndexes, MatrixBlock>> call(Tuple2<MatrixIndexes, MatrixBlock> arg0)
            throws Exception {
        MatrixIndexes ix = arg0._1();
        MatrixBlock mb = arg0._2();

        //sanity check inputs
        if (_byRow && (ix.getRowIndex() != 1 || mb.getNumRows() > 1)) {
            throw new Exception("Expected a row vector in ReplicateVector");
        }
        if (!_byRow && (ix.getColumnIndex() != 1 || mb.getNumColumns() > 1)) {
            throw new Exception("Expected a column vector in ReplicateVector");
        }

        ArrayList<Tuple2<MatrixIndexes, MatrixBlock>> retVal = new ArrayList<>();
        for (int i = 1; i <= _numReplicas; i++) {
            if (_byRow)
                retVal.add(new Tuple2<>(new MatrixIndexes(i, ix.getColumnIndex()), mb));
            else
                retVal.add(new Tuple2<>(new MatrixIndexes(ix.getRowIndex(), i), mb));
        }
        return retVal.iterator();
    }
}