org.deeplearning4j.optimize.stepfunctions.NegativeDefaultStepFunction Maven / Gradle / Ivy
/*******************************************************************************
* 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.deeplearning4j.optimize.stepfunctions;
import org.deeplearning4j.optimize.api.StepFunction;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;
/**
* Inverse step function
* @author Adam Gibson
*/
public class NegativeDefaultStepFunction implements StepFunction {
@Override
public void step(INDArray parameters, INDArray searchDirection, double step) {
Nd4j.getBlasWrapper().level1().axpy(searchDirection.length(), -step, searchDirection, parameters);
}
@Override
public void step(INDArray x, INDArray line) {
step(x, line, 1.0);
}
@Override
public void step() {
throw new UnsupportedOperationException();
}
}