org.nd4j.linalg.api.ops.impl.shape.SizeAt Maven / Gradle / Ivy
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* * terms of the Apache License, Version 2.0 which is available at
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package org.nd4j.linalg.api.ops.impl.shape;
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.ndarray.INDArray;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.nd4j.linalg.api.ops.Op;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class SizeAt extends DynamicCustomOp {
public SizeAt() {}
public SizeAt(INDArray input, int dimension) {
this(input, null, dimension);
}
public SizeAt(INDArray input, INDArray output, int dimension) {
super(null,input, output, new ArrayList(), new int[]{dimension});
}
public SizeAt(SameDiff sameDiff, SDVariable input, int dimension) {
super(null, sameDiff, new SDVariable[] {input}, false);
iArguments.add(Long.valueOf(dimension));
}
@Override
public String opName() {
return "size_at";
}
@Override
public Op.Type opType() {
return Op.Type.CUSTOM;
}
@Override
public List doDiff(List i_v) {
return Collections.singletonList(sameDiff.zerosLike(arg()));
}
@Override
public List calculateOutputDataTypes(List dataTypes){
Preconditions.checkState(dataTypes.size() == 1, "Expected list with exactly 1 datatype for %s, got %s", getClass(), dataTypes);
//Output type is always long (i.e., size of array)
return Collections.singletonList(DataType.LONG);
}
}