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 *  * terms of the Apache License, Version 2.0 which is available at
 *  * https://www.apache.org/licenses/LICENSE-2.0.
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 *  *  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
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package org.eclipse.deeplearning4j.nd4j.linalg.dataset;


import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.io.TempDir;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import org.nd4j.common.tests.tags.NativeTag;
import org.nd4j.common.tests.tags.TagNames;
import org.nd4j.linalg.BaseNd4jTestWithBackends;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.dataset.ExistingMiniBatchDataSetIterator;
import org.nd4j.linalg.dataset.MiniBatchFileDataSetIterator;
import org.nd4j.linalg.dataset.api.iterator.DataSetIterator;
import org.nd4j.linalg.factory.Nd4jBackend;

import java.nio.file.Path;

import static org.junit.jupiter.api.Assertions.assertEquals;

@Tag(TagNames.NDARRAY_ETL)
@NativeTag
@Tag(TagNames.FILE_IO)
public class MiniBatchFileDataSetIteratorTest extends BaseNd4jTestWithBackends {

    @TempDir Path testDir;

    @ParameterizedTest
    @MethodSource("org.nd4j.linalg.BaseNd4jTestWithBackends#configs")
    public void testMiniBatches(Nd4jBackend backend) throws Exception {
        DataSet load = new IrisDataSetIterator(150, 150).next();
        final MiniBatchFileDataSetIterator iter = new MiniBatchFileDataSetIterator(load, 10, false, testDir.toFile());
        while (iter.hasNext())
            assertEquals(10, iter.next().numExamples());
        if (iter.getRootDir() == null)
            return;
        DataSetIterator existing = new ExistingMiniBatchDataSetIterator(iter.getRootDir());
        while (iter.hasNext())
            assertEquals(10, existing.next().numExamples());
    }

    @Override
    public char ordering() {
        return 'f';
    }
}

