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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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* * information regarding copyright ownership.
* * 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
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* * SPDX-License-Identifier: Apache-2.0
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package org.nd4j.linalg.api.ops.impl.shape.bp;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.common.base.Preconditions;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.nd4j.linalg.exception.ND4JIllegalStateException;
import java.util.Collections;
import java.util.List;
@Slf4j
public class StridedSliceBp extends DynamicCustomOp {
private long[] begin;
private long[] end;
private long[] strides;
private int beginMask;
private int endMask;
private int ellipsisMask;
private int newAxisMask;
private int shrinkAxisMask;
public StridedSliceBp() {}
public StridedSliceBp(SameDiff sameDiff, @NonNull SDVariable in, @NonNull SDVariable grad, @NonNull long[] begin, @NonNull long[] end, @NonNull long[] strides,
int beginMask, int endMask, int ellipsisMask, int newAxisMask, int shrinkAxisMask){
super(null, sameDiff, new SDVariable[]{in, grad});
this.begin = begin;
this.end = end;
this.strides = strides;
this.beginMask = beginMask;
this.endMask = endMask;
this.ellipsisMask = ellipsisMask;
this.newAxisMask = newAxisMask;
this.shrinkAxisMask = shrinkAxisMask;
//https://github.com/deeplearning4j/libnd4j/blob/master/include/ops/declarable/generic/parity_ops/strided_slice.cpp#L279
addArguments();
}
public StridedSliceBp(SameDiff sameDiff, @NonNull SDVariable in, @NonNull SDVariable grad, @NonNull SDVariable begin, @NonNull SDVariable end,
@NonNull SDVariable strides, int beginMask, int endMask, int ellipsisMask, int newAxisMask, int shrinkAxisMask){
super(null, sameDiff, new SDVariable[]{in, grad, begin, end, strides});
this.beginMask = beginMask;
this.endMask = endMask;
this.ellipsisMask = ellipsisMask;
this.newAxisMask = newAxisMask;
this.shrinkAxisMask = shrinkAxisMask;
addArguments();
}
private void addArguments(){
addIArgument(beginMask);
addIArgument(ellipsisMask);
addIArgument(endMask);
addIArgument(newAxisMask);
addIArgument(shrinkAxisMask);
if(begin != null) { //May be null for SDVariable inputs of these args
addIArgument(begin);
addIArgument(end);
addIArgument(strides);
}
}
@Override
public String opName() {
return "strided_slice_bp";
}
@Override
public void assertValidForExecution() {
if(numInputArguments() != 2 && numInputArguments() != 4) {
throw new ND4JIllegalStateException("Num input arguments must be 2 or 4.");
}
if(numIArguments() < 5) {
throw new ND4JIllegalStateException("Number of integer arguments must >= 5");
}
}
@Override
public List doDiff(List i_v) {
throw new UnsupportedOperationException("Differentation not supported for backprop function: " + getClass().getSimpleName());
}
@Override
public List calculateOutputDataTypes(List dataTypes){
Preconditions.checkState(dataTypes.size() == 2 || dataTypes.size() == 5, "Expected list with exactly 2 or 5 datatypes for %s, got %s", getClass(), dataTypes);
//Output type is same as (original) input type
return Collections.singletonList(arg().dataType());
}
}