org.nd4j.linalg.api.ops.impl.transforms.custom.InvertPermutation Maven / Gradle / Ivy
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* * 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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* * See the NOTICE file distributed with this work for additional
* * information regarding copyright ownership.
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* * SPDX-License-Identifier: Apache-2.0
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package org.nd4j.linalg.api.ops.impl.transforms.custom;
import lombok.NoArgsConstructor;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.common.base.Preconditions;
import org.nd4j.common.util.ArrayUtil;
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.impl.transforms.BaseDynamicTransformOp;
import org.nd4j.linalg.factory.Nd4j;
import java.util.Collections;
import java.util.List;
/**
* Inverse of index permutation.
*
* @author Max Pumperla
*/
@NoArgsConstructor
public class InvertPermutation extends BaseDynamicTransformOp {
public InvertPermutation(SameDiff sameDiff, SDVariable input) {
this(sameDiff, input, false);
}
public InvertPermutation(SameDiff sameDiff, SDVariable input, boolean inPlace) {
super( sameDiff, new SDVariable[] {input}, inPlace);
}
public InvertPermutation(INDArray input) {
addInputArgument(input);
}
@Override
public String opName() {
return "invert_permutation";
}
@Override
public String onnxName() {
throw new NoOpNameFoundException("No onnx name found for shape " + opName());
}
@Override
public String tensorflowName() {
return "InvertPermutation";
}
@Override
public INDArray generateFake(long... shape) {
return Nd4j.arange(0, ArrayUtil.prod(shape),1.0).reshape(shape).castTo(Nd4j.defaultFloatingPointType());
}
@Override
public INDArray generateFake(DataType dataType, long... shape) {
return Nd4j.arange(0, ArrayUtil.prod(shape),1.0).reshape(shape).castTo(dataType);
}
public InvertPermutation(SameDiff sameDiff, SDVariable[] args, boolean inPlace) {
super(sameDiff, args, inPlace);
}
@Override
public List doDiff(List grad) {
SDVariable gradient = grad.get(0);
SDVariable invertedGradient = sameDiff.invertPermutation(gradient);
return Collections.singletonList(invertedGradient);
}
@Override
public List calculateOutputDataTypes(List dataTypes){
Preconditions.checkState(dataTypes != null && dataTypes.size() == 1, "Expected exactly 1 input datatype for %s, got %s", getClass(), dataTypes);
return dataTypes;
}
}