com.cloudera.oryx.ml.param.RandomSearch.java Source code

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Here is the source code for com.cloudera.oryx.ml.param.RandomSearch.java

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/*
 * Copyright (c) 2017, Cloudera and Intel, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. 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
 *
 * This software 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 com.cloudera.oryx.ml.param;

import com.cloudera.oryx.common.random.RandomManager;
import com.google.common.base.Preconditions;
import org.apache.commons.math3.random.RandomDataGenerator;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

final class RandomSearch {

    private RandomSearch() {
    }

    /**
     * @param ranges ranges of hyperparameters to try, one per hyperparameters
     * @param howMany how many combinations of hyperparameters to return
     * @return combinations of concrete hyperparameter values
     */
    static List<List<?>> chooseHyperParameterCombos(Collection<? extends HyperParamValues<?>> ranges, int howMany) {
        Preconditions.checkArgument(howMany > 0);

        int numParams = ranges.size();
        if (numParams == 0) {
            return Collections.singletonList(Collections.emptyList());
        }

        RandomDataGenerator rdg = new RandomDataGenerator(RandomManager.getRandom());
        List<List<?>> allCombinations = new ArrayList<>(howMany);
        for (int i = 0; i < howMany; i++) {
            List<Object> combination = new ArrayList<>(numParams);
            for (HyperParamValues<?> range : ranges) {
                combination.add(range.getRandomValue(rdg));
            }
            allCombinations.add(combination);
        }

        return allCombinations;
    }

}