/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.mahout.ga.watchmaker;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.fs.Path;
import org.uncommons.watchmaker.framework.FitnessEvaluator;
/** Watchmaker compatible Fitness Evaluator that delegates the evaluation of the whole population to Mahout. */
public class MahoutFitnessEvaluator<T> extends STFitnessEvaluator<T> {
private final FitnessEvaluator<? super T> evaluator;
public MahoutFitnessEvaluator(FitnessEvaluator<? super T> evaluator) {
this.evaluator = evaluator;
}
@Override
protected void evaluate(List<? extends T> population, List<Double> evaluations) {
try {
MahoutEvaluator.evaluate(evaluator, population, evaluations, new Path("input"), new Path("output"));
} catch (IOException e) {
throw new IllegalStateException("Exception while evaluating the population", e);
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Exception while evaluating the population", e);
} catch (InterruptedException e) {
throw new IllegalStateException("Exception while evaluating the population", e);
}
}
@Override
public boolean isNatural() {
return evaluator.isNatural();
}
}