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Java example source code file (ExistingDataSetIterator.java)
This example Java source code file (ExistingDataSetIterator.java) is included in the alvinalexander.com
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The ExistingDataSetIterator.java Java example source code
package org.deeplearning4j.datasets.iterator;
import lombok.NonNull;
import org.nd4j.linalg.dataset.api.*;
import org.nd4j.linalg.dataset.api.DataSetPreProcessor;
import org.nd4j.linalg.dataset.api.iterator.DataSetIterator;
import org.nd4j.linalg.dataset.DataSet;
import java.util.Iterator;
import java.util.List;
/**
* This wrapper provides DataSetIterator interface to existing java Iterable<DataSet> and Iterator
*
* @author raver119@gmail.com
*/
public class ExistingDataSetIterator implements DataSetIterator {
private transient DataSetPreProcessor preProcessor;
private transient Iterable<DataSet> iterable;
private transient Iterator<DataSet> iterator;
private int totalExamples = 0;
private int numFeatures = 0;
private int numLabels = 0;
private List<String> labels;
public ExistingDataSetIterator(@NonNull Iterator<DataSet> iterator) {
this.iterator = iterator;
}
public ExistingDataSetIterator(@NonNull Iterator<DataSet> iterator, @NonNull List labels) {
this(iterator);
this.labels = labels;
}
public ExistingDataSetIterator(@NonNull Iterable<DataSet> iterable) {
this.iterable = iterable;
this.iterator = iterable.iterator();
}
public ExistingDataSetIterator(@NonNull Iterable<DataSet> iterable, @NonNull List labels) {
this(iterable);
this.labels = labels;
}
public ExistingDataSetIterator(@NonNull Iterable<DataSet> iterable, int totalExamples, int numFeatures, int numLabels) {
this(iterable);
this.totalExamples = totalExamples;
this.numFeatures = numFeatures;
this.numLabels = numLabels;
}
@Override
public DataSet next(int num) {
// TODO: this might be changed
throw new UnsupportedOperationException("next(int) isn't supported");
}
@Override
public int totalExamples() {
return totalExamples;
}
@Override
public int inputColumns() {
return numFeatures;
}
@Override
public int totalOutcomes() {
if (labels != null)
return labels.size();
return numLabels;
}
@Override
public void reset() {
if (iterable != null)
this.iterator = iterable.iterator();
else throw new IllegalStateException("To use reset() method you need to provide Iterable<DataSet>, not Iterator");
}
@Override
public int batch() {
return 0;
}
@Override
public int cursor() {
return 0;
}
@Override
public int numExamples() {
return totalExamples;
}
@Override
public void setPreProcessor(DataSetPreProcessor preProcessor) {
this.preProcessor = preProcessor;
}
@Override
public List<String> getLabels() {
return labels;
}
@Override
public boolean hasNext() {
if (iterator != null)
return iterator.hasNext();
return false;
}
@Override
public DataSet next() {
if (preProcessor != null) {
DataSet ds = iterator.next();
preProcessor.preProcess(ds);
return ds;
} else return iterator.next();
}
@Override
public void remove() {
// no-op
}
}
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