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/*
* ******************************************************************************
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* *
* * This program and the accompanying materials are made available under the
* * terms of the Apache License, Version 2.0 which is available at
* * https://www.apache.org/licenses/LICENSE-2.0.
* *
* * See the NOTICE file distributed with this work for additional
* * information regarding copyright ownership.
* * 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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* * SPDX-License-Identifier: Apache-2.0
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package org.nd4j.linalg.learning.config;
import lombok.Builder;
import lombok.Data;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.learning.GradientUpdater;
import org.nd4j.linalg.learning.RmsPropUpdater;
import org.nd4j.linalg.schedule.ISchedule;
import org.nd4j.shade.jackson.annotation.JsonProperty;
import java.util.Map;
@Data
@Builder(builderClassName = "Builder")
public class RmsProp implements IUpdater {
public static final double DEFAULT_RMSPROP_LEARNING_RATE = 1e-1;
public static final double DEFAULT_RMSPROP_EPSILON = 1e-8;
public static final double DEFAULT_RMSPROP_RMSDECAY = 0.95;
@lombok.Builder.Default private double learningRate = DEFAULT_RMSPROP_LEARNING_RATE;
private ISchedule learningRateSchedule;
@lombok.Builder.Default private double rmsDecay = DEFAULT_RMSPROP_RMSDECAY;
@lombok.Builder.Default private double epsilon = DEFAULT_RMSPROP_EPSILON;
public RmsProp(){
this(DEFAULT_RMSPROP_LEARNING_RATE, null, DEFAULT_RMSPROP_RMSDECAY, DEFAULT_RMSPROP_EPSILON);
}
public RmsProp(double learningRate){
this(learningRate, null, DEFAULT_RMSPROP_RMSDECAY, DEFAULT_RMSPROP_EPSILON);
}
public RmsProp(ISchedule learningRateSchedule){
this(Double.NaN, learningRateSchedule, DEFAULT_RMSPROP_RMSDECAY, DEFAULT_RMSPROP_EPSILON);
}
public RmsProp(double learningRate, double rmsDecay, double epsilon){
this(learningRate, null, rmsDecay, epsilon);
}
private RmsProp(@JsonProperty("learningRate") double learningRate,
@JsonProperty("learningRateSchedule") ISchedule learningRateSchedule,
@JsonProperty("rmsDecay") double rmsDecay,
@JsonProperty("epsilon") double epsilon){
this.learningRate = learningRate;
this.learningRateSchedule = learningRateSchedule;
this.rmsDecay = rmsDecay;
this.epsilon = epsilon;
}
@Override
public long stateSize(long numParams) {
return numParams;
}
@Override
public GradientUpdater instantiate(INDArray viewArray, boolean initializeViewArray) {
RmsPropUpdater u = new RmsPropUpdater(this);
u.setStateViewArray(viewArray, viewArray.shape(), viewArray.ordering(), initializeViewArray);
return u;
}
@Override
public GradientUpdater instantiate(Map updaterState, boolean initializeStateArrays) {
RmsPropUpdater u = new RmsPropUpdater(this);
u.setState(updaterState, initializeStateArrays);
return u;
}
@Override
public RmsProp clone() {
return new RmsProp(learningRate, learningRateSchedule, rmsDecay, epsilon);
}
@Override
public double getLearningRate(int iteration, int epoch){
if(learningRateSchedule != null){
return learningRateSchedule.valueAt(iteration, epoch);
}
return learningRate;
}
@Override
public boolean hasLearningRate() {
return true;
}
@Override
public void setLrAndSchedule(double lr, ISchedule lrSchedule) {
this.learningRate = lr;
this.learningRateSchedule = lrSchedule;
}
//Partial builder implementation to give public no-arg constructor
public static class Builder {
public Builder(){ }
}
}