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/*-
 *
 *  * Copyright 2016 Skymind,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.
 *
 */

package org.deeplearning4j.earlystopping.trainer;

import org.deeplearning4j.earlystopping.EarlyStoppingConfiguration;
import org.deeplearning4j.earlystopping.listener.EarlyStoppingListener;
import org.deeplearning4j.nn.graph.ComputationGraph;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.dataset.api.MultiDataSet;
import org.nd4j.linalg.dataset.api.iterator.DataSetIterator;
import org.nd4j.linalg.dataset.api.iterator.MultiDataSetIterator;

/**
 * Class for conducting early stopping training locally (single machine).

 * Can be used to train a {@link ComputationGraph}
 */
public class EarlyStoppingGraphTrainer extends BaseEarlyStoppingTrainer { //implements IEarlyStoppingTrainer {
    private ComputationGraph net;

    /**
     * @param esConfig Configuration
     * @param net Network to train using early stopping
     * @param train DataSetIterator for training the network
     */
    public EarlyStoppingGraphTrainer(EarlyStoppingConfiguration esConfig, ComputationGraph net,
                    DataSetIterator train) {
        this(esConfig, net, train, null);
    }

    /**Constructor for training using a {@link DataSetIterator}
     * @param esConfig Configuration
     * @param net Network to train using early stopping
     * @param train DataSetIterator for training the network
     * @param listener Early stopping listener. May be null.
     */
    public EarlyStoppingGraphTrainer(EarlyStoppingConfiguration esConfig, ComputationGraph net,
                    DataSetIterator train, EarlyStoppingListener listener) {
        super(esConfig, net, train, null, listener);
        if (net.getNumInputArrays() != 1 || net.getNumOutputArrays() != 1)
            throw new IllegalStateException(
                            "Cannot do early stopping training on ComputationGraph with DataSetIterator: graph does not have 1 input and 1 output array");
        this.net = net;
    }

    /**Constructor for training using a {@link MultiDataSetIterator}
     * @param esConfig Configuration
     * @param net Network to train using early stopping
     * @param train DataSetIterator for training the network
     * @param listener Early stopping listener. May be null.
     */
    public EarlyStoppingGraphTrainer(EarlyStoppingConfiguration esConfig, ComputationGraph net,
                    MultiDataSetIterator train, EarlyStoppingListener listener) {
        super(esConfig, net, null, train, listener);
        this.net = net;
    }

    @Override
    protected void fit(DataSet ds) {
        net.fit(ds);
    }

    @Override
    protected void fit(MultiDataSet mds) {
        net.fit(mds);
    }
}