/*
* Encog(tm) Core v3.4 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2016 Heaton Research, 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.
*
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package org.encog.ml.data.folded;
import org.encog.Encog;
import org.encog.ml.data.MLDataPair;
import org.encog.ml.data.MLDataSet;
import org.encog.ml.data.basic.BasicMLDataPair;
import org.encog.ml.data.basic.BasicMLDataSet;
import org.junit.Assert;
import org.junit.Test;
public class TestFoldedDataSet {
private FoldedDataSet performFoldTest(int recordCount, int foldCount, int testIndex1, int testCount1, int testIndex2, int testCount2) {
MLDataSet dataSet = new BasicMLDataSet();
for(int i=0;i<recordCount;i++) {
final MLDataPair pair = BasicMLDataPair.createPair(4,1);
pair.getIdeal().setData(0, i);
dataSet.add(pair);
}
FoldedDataSet foldedData = new FoldedDataSet(dataSet);
foldedData.fold(foldCount);
foldedData.setCurrentFold(testIndex1);
Assert.assertEquals(testCount1, foldedData.size());
foldedData.setCurrentFold(testIndex2);
Assert.assertEquals(testCount2, foldedData.size());
testFoldedAccess(dataSet, foldedData);
return foldedData;
}
private void testFoldedAccess(MLDataSet dataSet, FoldedDataSet foldedDataSet) {
int parentIndex = 0;
for(int i=0;i<foldedDataSet.getNumFolds();i++) {
foldedDataSet.setCurrentFold(i);
int expectedCount = foldedDataSet.size();
int actualCount = 0;
for(MLDataPair pair: foldedDataSet) {
actualCount++;
Assert.assertEquals(parentIndex, pair.getIdeal().getData(0), Encog.DEFAULT_DOUBLE_EQUAL);
parentIndex++;
}
Assert.assertEquals(expectedCount, actualCount);
}
}
@Test
public void testFoldedEven() {
performFoldTest(50, 5, 0, 10, 4, 10);
}
@Test
public void testFoldedOdd() {
performFoldTest(53, 5, 0, 10, 4, 13);
}
@Test
public void testFoldedSmall() {
performFoldTest(3, 5, 0, 1, 2, 1);
}
}