org.nd4j.linalg.dataset.api.iterator.BaseDatasetIterator Maven / Gradle / Ivy
/*-
*
* * Copyright 2015 Skymind,Inc.
* *
* * Licensed 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.nd4j.linalg.dataset.api.iterator;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.dataset.api.DataSetPreProcessor;
import org.nd4j.linalg.dataset.api.iterator.fetcher.DataSetFetcher;
import java.util.List;
/**
* Baseline implementation includes
* control over the data fetcher and some basic
* getters for metadata
*
* @author Adam Gibson
*/
public class BaseDatasetIterator implements DataSetIterator {
private static final long serialVersionUID = -116636792426198949L;
protected int batch, numExamples;
protected DataSetFetcher fetcher;
protected DataSetPreProcessor preProcessor;
public BaseDatasetIterator(int batch, int numExamples, DataSetFetcher fetcher) {
this.batch = batch;
if (numExamples < 0)
numExamples = fetcher.totalExamples();
this.numExamples = numExamples;
this.fetcher = fetcher;
}
@Override
public boolean hasNext() {
return fetcher.hasMore() && fetcher.cursor() < numExamples;
}
@Override
public DataSet next() {
fetcher.fetch(batch);
return fetcher.next();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public int totalExamples() {
return fetcher.totalExamples();
}
@Override
public int inputColumns() {
return fetcher.inputColumns();
}
@Override
public int totalOutcomes() {
return fetcher.totalOutcomes();
}
@Override
public boolean resetSupported() {
return true;
}
@Override
public boolean asyncSupported() {
return true;
}
@Override
public void reset() {
fetcher.reset();
}
@Override
public int batch() {
return batch;
}
@Override
public int cursor() {
return fetcher.cursor();
}
@Override
public int numExamples() {
return numExamples;
}
/**
* Set a pre processor
*
* @param preProcessor a pre processor to set
*/
@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) {
fetcher.fetch(num);
DataSet next = fetcher.next();
if (preProcessor != null)
preProcessor.preProcess(next);
return next;
}
}