org.nd4j.linalg.dataset.api.iterator.TestDataSetIterator Maven / Gradle / Ivy
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* * This program and the accompanying materials are made available under the
* * terms of the Apache License, Version 2.0 which is available at
* * https://www.apache.org/licenses/LICENSE-2.0.
* *
* * See the NOTICE file distributed with this work for additional
* * information regarding copyright ownership.
* * 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.
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* * SPDX-License-Identifier: Apache-2.0
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*/
package org.nd4j.linalg.dataset.api.iterator;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.dataset.api.DataSetPreProcessor;
import java.util.ArrayList;
import java.util.List;
public class TestDataSetIterator implements DataSetIterator {
private static final long serialVersionUID = -7569201667767185411L;
private int curr = 0;
private int batch = 10;
private List list;
private DataSetPreProcessor preProcessor;
public TestDataSetIterator(DataSet dataset, int batch) {
this(dataset.asList(), batch);
}
public TestDataSetIterator(List coll, int batch) {
list = new ArrayList<>(coll);
this.batch = batch;
}
/**
* This makes an iterator from the given dataset and batchsize
* ONLY for use in tests in nd4j
* Initializes with a default batch of 5
*
* @param dataset the dataset to make the iterator from
* @param batch the batchsize for the iterator
*/
public TestDataSetIterator(DataSet dataset) {
this(dataset, 5);
}
@Override
public synchronized boolean hasNext() {
return curr < list.size();
}
@Override
public synchronized DataSet next() {
return next(batch);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public int inputColumns() {
return (int)list.get(0).getFeatures().columns();
}
@Override
public int totalOutcomes() {
return (int) list.get(0).getLabels().columns();
}
@Override
public boolean resetSupported() {
return true;
}
@Override
public boolean asyncSupported() {
return false;
}
@Override
public synchronized void reset() {
curr = 0;
}
@Override
public int batch() {
return batch;
}
@Override
public void setPreProcessor(DataSetPreProcessor preProcessor) {
this.preProcessor = preProcessor;
}
@Override
public DataSetPreProcessor getPreProcessor() {
return preProcessor;
}
@Override
public List getLabels() {
return null;
}
@Override
public DataSet next(int num) {
int end = curr + num;
List r = new ArrayList<>();
if (end >= list.size())
end = list.size();
for (; curr < end; curr++) {
r.add(list.get(curr));
}
DataSet d = DataSet.merge(r);
if (preProcessor != null)
preProcessor.preProcess(d);
return d;
}
}