org.nd4j.linalg.api.ops.impl.transforms.custom.LogSoftMax Maven / Gradle / Ivy
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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.api.ops.impl.transforms.custom;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.base.Preconditions;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.nd4j.linalg.factory.Nd4j;
import java.util.Collections;
import java.util.List;
/**
* Log(softmax(X))
*
* @author Alex Black
*/
public class LogSoftMax extends DynamicCustomOp {
private Integer dimension = null;
public LogSoftMax(SameDiff sameDiff, SDVariable i_v) {
super(sameDiff, i_v);
}
public LogSoftMax() {
}
public LogSoftMax(INDArray x, INDArray z) {
super(null, x, z, null, null);
}
public LogSoftMax(INDArray x) {
this(x, x);
}
public LogSoftMax(SameDiff sameDiff, SDVariable i_v, int dimension) {
this(sameDiff, i_v);
this.dimension = dimension;
addIArgument(dimension);
}
@Override
public String opName() {
return "log_softmax";
}
@Override
public String tensorflowName() {
return "LogSoftmax";
}
@Override
public List doDiff(List i_v) {
if(dimension == null) {
SDVariable ret = f().logSoftmaxDerivative(arg(), i_v.get(0));
return Collections.singletonList(ret);
} else {
SDVariable ret = f().logSoftmaxDerivative(arg(), i_v.get(0), dimension);
return Collections.singletonList(ret);
}
}
@Override
public List calculateOutputDataTypes(List inTypes){
Preconditions.checkState(inTypes != null && inTypes.size() == 1, "Expected 1 input datatype for %s, got %s",
getClass(), inTypes);
if(inTypes.get(0).isFPType())
return Collections.singletonList(inTypes.get(0));
return Collections.singletonList(Nd4j.defaultFloatingPointType());
}
}