org.nd4j.linalg.api.ops.impl.loss.SparseSoftmaxCrossEntropyLossWithLogits 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.
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* under the License.
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* SPDX-License-Identifier: Apache-2.0
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package org.nd4j.linalg.api.ops.impl.loss;
import lombok.NoArgsConstructor;
import lombok.val;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.autodiff.samediff.internal.SameDiffOp;
import org.nd4j.base.Preconditions;
import org.nd4j.imports.NoOpNameFoundException;
import org.nd4j.imports.descriptors.properties.PropertyMapping;
import org.nd4j.imports.graphmapper.tf.TFGraphMapper;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.nd4j.linalg.api.ops.Op;
import org.tensorflow.framework.AttrValue;
import org.tensorflow.framework.GraphDef;
import org.tensorflow.framework.NodeDef;
import java.util.*;
/**
* Sparse softmax cross entropy loss with logits.
* Applies softmax to the input, then calculates cross entropy loss. Labels should be in integer-index format,
* not one-hot format
*
* @author Alex Black
*/
@NoArgsConstructor
public class SparseSoftmaxCrossEntropyLossWithLogits extends DynamicCustomOp {
public SparseSoftmaxCrossEntropyLossWithLogits(SameDiff sameDiff, SDVariable logits, SDVariable labels) {
super(null, sameDiff, new SDVariable[]{labels, logits}, false);
}
public void addArgs() {
}
@Override
public void initFromTensorFlow(NodeDef nodeDef, SameDiff initWith, Map attributesForNode, GraphDef graph) {
TFGraphMapper.initFunctionFromProperties(nodeDef.getOp(), this, attributesForNode, nodeDef, graph);
//Switch order: TF uses [logits, labels]; libnd4j expects [labels, logits]
SameDiffOp op = initWith.getOps().get(this.getOwnName());
List list = op.getInputsToOp();
List newList = Arrays.asList(list.get(1), list.get(0));
op.setInputsToOp(newList);
}
@Override
public String opName() {
return "sparse_softmax_cross_entropy_loss_with_logits";
}
@Override
public String onnxName() {
throw new NoOpNameFoundException("No onnx op opName found for " + opName());
}
@Override
public String tensorflowName() {
return "SparseSoftmaxCrossEntropyWithLogits";
}
@Override
public Op.Type opType() {
return Op.Type.CUSTOM;
}
@Override
public List calculateOutputDataTypes(List inputDataTypes){
Preconditions.checkState(inputDataTypes != null && inputDataTypes.size() == 2, "Expected 2 input datatypes for %s, got %s", getClass(), inputDataTypes);
return Collections.singletonList(inputDataTypes.get(1)); //Same as predictions (logits)
}
@Override
public List doDiff(List grad){
//args: label, logits
SDVariable[] ret = f().lossSparseSoftmaxCrossEntropyBp(arg(1), arg(0));
return Arrays.asList(f().zerosLike(arg(0)), ret[0]);
}
}