org.nd4j.linalg.api.ops.impl.transforms.custom.DynamicStitch Maven / Gradle / Ivy
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package org.nd4j.linalg.api.ops.impl.transforms.custom;
import lombok.NonNull;
import org.apache.commons.lang3.ArrayUtils;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.common.base.Preconditions;
import org.nd4j.imports.NoOpNameFoundException;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
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.*;
public class DynamicStitch extends DynamicCustomOp {
private int numPartitions;
private SDVariable[] indices;
public DynamicStitch() {
}
public DynamicStitch(SameDiff sameDiff, SDVariable[] indices, SDVariable[] inputs) {
super(null, sameDiff, ArrayUtils.addAll(indices, inputs), false);
this.indices = indices;
this.numPartitions = inputs.length;
}
public DynamicStitch(@NonNull INDArray[] indices, @NonNull INDArray[] inputs) {
super(ArrayUtils.addAll(indices, inputs), null);
}
@Override
public List doDiff(List i_v) {
// DynamicPartition and DynamicStitch are mutually inverse
SDVariable gradient = i_v.get(0);
SDVariable[] partitionData = new SDVariable[indices.length];
for (int i = 0; i < indices.length; i++)
partitionData[i] = sameDiff.onesLike(indices[i]).mul(i);
SDVariable partitions = sameDiff.dynamicStitch(indices, partitionData);
SDVariable[] partition = sameDiff.dynamicPartition(gradient, partitions, numPartitions);
List ret = new ArrayList<>();
for (SDVariable i : indices)
ret.add(sameDiff.zerosLike(i));
Collections.addAll(ret, partition);
return ret;
}
@Override
public void initFromTensorFlow(NodeDef nodeDef, SameDiff initWith, Map attributesForNode, GraphDef graph) {
this.numPartitions = (int)attributesForNode.get("N").getI();
}
@Override
public String opName() {
return "dynamic_stitch";
}
@Override
public String[] tensorflowNames() {
return new String[]{"DynamicStitch", "ParallelDynamicStitch"};
}
@Override
public String onnxName() {
throw new NoOpNameFoundException("No onnx name found for shape " + opName());
}
@Override
public List calculateOutputDataTypes(List dataTypes){
Preconditions.checkState(dataTypes != null && dataTypes.size() == 2*numPartitions, "Expected %s input datatypes for %s partitions for %s, got %s",
2*numPartitions, numPartitions, getClass(), dataTypes);
//Output type: same as (data) input type... only 1 output, however
DataType inputType = dataTypes.get(dataTypes.size()-1);
return Collections.singletonList(inputType);
}
}