/**
* 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.mahout.utils.vectors;
import org.apache.mahout.matrix.Vector;
import org.apache.mahout.matrix.DenseVector;
import org.apache.mahout.matrix.UnaryFunction;
import org.apache.mahout.matrix.SparseVector;
import org.apache.mahout.common.RandomUtils;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Random;
public class RandomVectorIterable implements Iterable<Vector>{
private int numItems = 100;
public enum VectorType {DENSE, SPARSE}
private VectorType type = VectorType.SPARSE;
public RandomVectorIterable() {
}
public RandomVectorIterable(int numItems) {
this.numItems = numItems;
}
public RandomVectorIterable(int numItems, VectorType type) {
this.numItems = numItems;
this.type = type;
}
@Override
public Iterator<Vector> iterator() {
return new VectIterator();
}
private class VectIterator implements Iterator<Vector>{
private int count = 0;
private final Random random = RandomUtils.getRandom();
@Override
public boolean hasNext() {
return count < numItems;
}
@Override
public Vector next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
Vector result = type == VectorType.SPARSE ? new SparseVector(numItems) : new DenseVector(numItems);
result.assign(new UnaryFunction(){
@Override
public double apply(double arg1) {
return random.nextDouble();
}
});
count++;
return result;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
}