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Java example source code file (DataSetFetcher.java)

This example Java source code file (DataSetFetcher.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

dataset, datasetfetcher, deprecated, serializable

The DataSetFetcher.java Java example source code

/*
 *
 *  * 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.deeplearning4j.datasets.iterator;

import org.nd4j.linalg.dataset.DataSet;

import java.io.Serializable;

/**
 * A low level interface for loading datasets in to memory.
 * 
 * This is used by an {@link DataSetIterator} to
 * 
 * handle the specifics of loading data in to memory.
 * @author Adam Gibson
 *
 */
@Deprecated
public interface DataSetFetcher extends Serializable {

	/**
	 * Whether the dataset has more to load
	 * @return whether the data applyTransformToDestination has more to load
	 */
	boolean hasMore();
	
	/**
	 * Returns the next data applyTransformToDestination
	 * @return the next dataset
	 */
	DataSet next();
	
	/**
	 * Fetches the next dataset. You need to call this
	 * to getFromOrigin a new dataset, otherwise {@link #next()}
	 * just returns the last data applyTransformToDestination fetch
	 * @param numExamples the number of examples to fetch
	 */
	void fetch(int numExamples);
	
	/**
	 * The number of labels for a dataset
	 * @return the number of labels for a dataset
	 */
	int totalOutcomes();
	/**
	 * The length of a feature vector for an individual example
	 * @return the length of a feature vector for an individual example
	 */
	int inputColumns();
	/**
	 * The total number of examples
	 * @return the total number of examples
	 */
	int totalExamples();
	/**
	 * Returns the fetcher back to the beginning of the dataset
	 */
	void reset();
	/**
	 * Direct access to a number represenative of iterating through a dataset
	 * @return a cursor similar to an index
	 */
	int cursor();
}

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