source: trunk/CrossPare/src/de/ugoe/cs/cpdp/eval/CVWekaEvaluation.java @ 117

Last change on this file since 117 was 86, checked in by sherbold, 9 years ago
  • switched workspace encoding to UTF-8 and fixed broken characters
  • Property svn:mime-type set to text/plain
File size: 1.8 KB
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1// Copyright 2015 Georg-August-Universität Göttingen, Germany
2//
3//   Licensed under the Apache License, Version 2.0 (the "License");
4//   you may not use this file except in compliance with the License.
5//   You may obtain a copy of the License at
6//
7//       http://www.apache.org/licenses/LICENSE-2.0
8//
9//   Unless required by applicable law or agreed to in writing, software
10//   distributed under the License is distributed on an "AS IS" BASIS,
11//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12//   See the License for the specific language governing permissions and
13//   limitations under the License.
14
15package de.ugoe.cs.cpdp.eval;
16
17import java.io.PrintStream;
18import java.util.Random;
19
20import org.apache.commons.io.output.NullOutputStream;
21
22import weka.classifiers.Classifier;
23import weka.classifiers.Evaluation;
24import weka.core.Instances;
25
26/**
27 * Implements the {@link AbstractWekaEvaluation} for 10-fold cross validation.
28 *
29 * @author Steffen Herbold
30 */
31public class CVWekaEvaluation extends AbstractWekaEvaluation {
32
33    /**
34     * @see de.ugoe.cs.cpdp.eval.AbstractWekaEvaluation#createEvaluator(weka.core.Instances,
35     *      weka.classifiers.Classifier)
36     */
37    @Override
38    protected Evaluation createEvaluator(Instances testdata, Classifier classifier) {
39        PrintStream errStr = System.err;
40        System.setErr(new PrintStream(new NullOutputStream()));
41        try {
42            final Evaluation eval = new Evaluation(testdata);
43            eval.crossValidateModel(classifier, testdata, 10, new Random(1));
44            return eval;
45        }
46        catch (Exception e) {
47            throw new RuntimeException(e);
48        }
49        finally {
50            System.setErr(errStr);
51        }
52    }
53
54}
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