org.nd4j.linalg.api.blas.params.GemvParameters Maven / Gradle / Ivy
package org.nd4j.linalg.api.blas.params;
import lombok.Data;
import org.nd4j.linalg.api.complex.IComplexNDArray;
import org.nd4j.linalg.api.ndarray.INDArray;
/**
* Gemv parameters:
* The parameters for general matrix
* vector operations
*
* @author Adam Gibson
*/
public @Data class GemvParameters {
private int m, n, lda, incx, incy;
private INDArray a, x, y;
private char aOrdering = 'N';
public GemvParameters(INDArray a, INDArray x, INDArray y) {
a = copyIfNecessary(a);
x = copyIfNecessaryVector(x);
this.a = a;
this.x = x;
this.y = y;
if (a.ordering() == 'f' && a.isMatrix()) {
this.m = a.rows();
this.n = a.columns();
this.lda = a.rows();
} else if (a.ordering() == 'c' && a.isMatrix()) {
this.m = a.columns();
this.n = a.rows();
this.lda = a.columns();
aOrdering = 'T';
}
else {
this.m = a.rows();
this.n = a.columns();
this.lda = a.size(0);
}
if (x.isColumnVector()) {
incx = x.stride(0);
} else {
incx = x.stride(1);
}
this.incy = y.elementWiseStride();
if (x instanceof IComplexNDArray)
this.incx /= 2;
if (y instanceof IComplexNDArray)
this.incy /= 2;
}
private INDArray copyIfNecessary(INDArray arr) {
//See also: Shape.toMmulCompatible - want same conditions here and there
//Check if matrix values are contiguous in memory. If not: dup
//Contiguous for c if: stride[0] == shape[1] and stride[1] = 1
//Contiguous for f if: stride[0] == 1 and stride[1] == shape[0]
if (arr.ordering() == 'c' && (arr.stride(0) != arr.size(1) || arr.stride(1) != 1))
return arr.dup();
else if (arr.ordering() == 'f' && (arr.stride(0) != 1 || arr.stride(1) != arr.size(0)))
return arr.dup();
else if (arr.elementWiseStride() < 1)
return arr.dup();
return arr;
}
private INDArray copyIfNecessaryVector(INDArray vec) {
if (vec.offset() != 0)
return vec.dup();
return vec;
}
}