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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.scatter;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.base.Preconditions;
import org.nd4j.imports.NoOpNameFoundException;
import org.nd4j.imports.graphmapper.tf.TFGraphMapper;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.tensorflow.framework.AttrValue;
import org.tensorflow.framework.GraphDef;
import org.tensorflow.framework.NodeDef;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* Created by farizrahman4u on 3/23/18.
*/
public class ScatterDiv extends DynamicCustomOp {
public ScatterDiv(SameDiff sameDiff, SDVariable ref, SDVariable indices, SDVariable updates) {
super(null, sameDiff, new SDVariable[]{ref, indices, updates}, false);
}
public ScatterDiv() {}
@Override
public String opName() {
return "scatter_div";
}
@Override
public String onnxName() {
throw new NoOpNameFoundException("No onnx op opName found for " + opName());
}
@Override
public String tensorflowName() {
return "ScatterDiv";
}
@Override
public List doDiff(List gradOut){
//3 args: ref, indices, updates
//For non-modified indices, input gradient (referenc) is same as output gradient
//For modified indices, dL/dref = dL/dOut * dOut/dRef = dL/dOut * d(ref / update)/dRef = dL/dOut / update
//And for updates, dL/du = dL/dOut * dOut/du = dL/dOut * d(ref / update)/du = dL/dOut * ref / u^2
SDVariable ref = arg(0);
SDVariable indices = arg(1);
SDVariable updates = arg(2);
List ret = new ArrayList<>(3);
SDVariable gradRef = f().scatterDiv(gradOut.get(0), indices, updates);
ret.add(gradRef); //Reference array
ret.add(f().zerosLike(arg(1))); //Indices
SDVariable gatherOutGrad = f().gather(gradOut.get(0), indices, 0); //Updates
SDVariable gatherRef = f().gather(ref, indices, 0);
SDVariable updateGrad = gatherOutGrad.mul(gatherRef).div(f().square(updates)).neg();
ret.add(updateGrad);
return ret;
}
@Override
public void initFromTensorFlow(NodeDef nodeDef, SameDiff initWith, Map attributesForNode, GraphDef graph) {
TFGraphMapper.initFunctionFromProperties(nodeDef.getOp(), this, attributesForNode, nodeDef, graph);
if (nodeDef.containsAttr("use_locking")) {
if (nodeDef.getAttrOrThrow("use_locking").getB() == true) {
bArguments.add(true);
} else {
bArguments.add(false);
}
} else
bArguments.add(false);
}
@Override
public List calculateOutputDataTypes(List inputDataTypes){
Preconditions.checkState(inputDataTypes != null && inputDataTypes.size() == 3, "Expected exactly 3 input datatypes for %s, got %s", getClass(), inputDataTypes);
Preconditions.checkState(inputDataTypes.get(0) == inputDataTypes.get(2), "Reference (input 0) and updates (input 2) must have exactly same data types, got %s and %s",
inputDataTypes.get(0), inputDataTypes.get(2));
return Collections.singletonList(inputDataTypes.get(0));
}
}