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/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 *
 * 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.
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

package org.nd4j.linalg.schedule;

import lombok.Data;
import org.nd4j.shade.jackson.annotation.JsonProperty;

/**
 * An exponential schedule, with 2 parameters: initial value, and gamma.
* value(i) = initialValue * gamma^i * where i is the iteration or epoch (depending on the setting) * * @author Alex Black */ @Data public class ExponentialSchedule implements ISchedule { private final ScheduleType scheduleType; private final double initialValue; private final double gamma; public ExponentialSchedule(@JsonProperty("scheduleType") ScheduleType scheduleType, @JsonProperty("initialValue") double initialValue, @JsonProperty("gamma") double gamma){ this.scheduleType = scheduleType; this.initialValue = initialValue; this.gamma = gamma; } @Override public double valueAt(int iteration, int epoch) { int i = (scheduleType == ScheduleType.ITERATION ? iteration : epoch); return initialValue * Math.pow(gamma, i); } @Override public ISchedule clone() { return new ExponentialSchedule(scheduleType, initialValue, gamma); } }




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