org.nd4j.linalg.api.ops.impl.loss.LogPoissonLoss Maven / Gradle / Ivy
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* Copyright (c) 2015-2019 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.api.ops.impl.loss;
import org.nd4j.autodiff.loss.LossReduce;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import java.util.Arrays;
import java.util.List;
/**
* Log Poisson loss
*
* Note: This expects that the input/predictions are log(x) not x!
*
* @author Paul Dubs
*/
public class LogPoissonLoss extends BaseLoss {
private boolean full;
public LogPoissonLoss(SameDiff sameDiff, LossReduce lossReduce, SDVariable predictions, SDVariable weights, SDVariable labels){
this(sameDiff, lossReduce, predictions, weights, labels, false);
}
public LogPoissonLoss(SameDiff sameDiff, LossReduce lossReduce, SDVariable predictions, SDVariable weights, SDVariable labels, boolean full){
super(sameDiff, lossReduce, predictions, weights, labels);
this.full = full;
addArgs();
}
public LogPoissonLoss(){ }
protected void addArgs(){
super.addArgs();
if(full){
iArguments.add((long) 1);
}
}
@Override
public String opName() {
return "log_poisson_loss";
}
@Override
public List doDiff(List grad){
//No external gradient
//Args are: predictions, weights, label
SDVariable[] grads;
if(full) {
grads = f().lossLogPoissonFullBp(arg(2), arg(0), arg(1), lossReduce);
}else{
grads = f().lossLogPoissonBp(arg(2), arg(0), arg(1), lossReduce);
}
return Arrays.asList(grads);
}
}