org.apache.sysds.runtime.compress.colgroup

Class ColGroupConverter

java.lang.Object

org.apache.sysds.runtime.compress.colgroup.ColGroupConverter

public class ColGroupConverter
extends Object

Utility functions for ColGroup to convert ColGroups or MatrixBlocks. to other representations.

Constructor Summary

Constructors

Constructor and Description
ColGroupConverter()

Method Summary

Modifier and Type	Method and Description
static ColGroup	copyColGroup(ColGroup group) Copy col group instance with deep copy of column indices but shallow copy of actual contents;
static double[]	getDenseVector(MatrixBlock vector) Extract the double array primitive from a Matrix Block that is an vector.
static MatrixBlock	getUncompressedColBlock(ColGroup group) Extracts the Uncompressed MatrixBlock representation of a Col Group

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ColGroupConverter

public ColGroupConverter()

Method Detail

copyColGroup

public static ColGroup copyColGroup(ColGroup group)

Copy col group instance with deep copy of column indices but shallow copy of actual contents;

Parameters:

group - column group

Returns:

column group (deep copy of indices but shallow copy of contents)

getDenseVector

public static double[] getDenseVector(MatrixBlock vector)

Extract the double array primitive from a Matrix Block that is an vector.

Parameters:

vector - The Matrix block vector

Returns:

The double array primitive

getUncompressedColBlock

public static MatrixBlock getUncompressedColBlock(ColGroup group)

Extracts the Uncompressed MatrixBlock representation of a Col Group

Parameters:

group - an ColGroup to decompress

Returns:

A MatrixBlock.