Package org.apache.sysds.runtime.compress.lib

Interface CLALibSelectionMult

public interface CLALibSelectionMult

This lib is responsible for selecting and extracting specific rows or columns from a compressed matrix. The operation performed is like a left matrix multiplication where the left side only have max 1 non zero per row.

Field Summary

Fields

Modifier and Type	Field	Description
static org.apache.commons.logging.Log	LOG

Method Summary

Static Methods

Modifier and Type	Method	Description
static boolean	isSelectionMatrix(MatrixBlock mb)	Analyze if the given matrix is a selection matrix if on the left side of a matrix multiplication.
static MatrixBlock	leftSelection(CompressedMatrixBlock right, MatrixBlock left, MatrixBlock ret, int k)	Left selection where the left matrix is sparse with a max 1 non zero per row and that non zero is a 1.

Field Detail

LOG

static final org.apache.commons.logging.Log LOG

Method Detail

leftSelection

static MatrixBlock leftSelection(CompressedMatrixBlock right,
                                 MatrixBlock left,
                                 MatrixBlock ret,
                                 int k)

Left selection where the left matrix is sparse with a max 1 non zero per row and that non zero is a 1.

Parameters:

right - Right hand side compressed matrix

left - Left hand side matrix

ret - Output matrix to put the result into.

k - The parallelization degree.

Returns:

The selected rows and columns of the input matrix

isSelectionMatrix

static boolean isSelectionMatrix(MatrixBlock mb)

Analyze if the given matrix is a selection matrix if on the left side of a matrix multiplication.

Parameters:

mb - The given matrix that should be on the left side

Returns:

If it is selective