Package org.apache.sysds.runtime.compress.colgroup

Class ColGroupFactory

java.lang.Object

org.apache.sysds.runtime.compress.colgroup.ColGroupFactory

public class ColGroupFactory
extends Object

Factory class for constructing ColGroups.

Method Summary

Modifier and Type	Method	Description
static List<AColGroup>	compressColGroups(MatrixBlock in, CompressedSizeInfo csi, CompressionSettings cs, int k)	The actual compression method, that handles the logic of compressing multiple columns together.
static List<AColGroup>	compressColGroups(MatrixBlock in, CompressedSizeInfo csi, CompressionSettings cs, ACostEstimate ce, int k)

Methods inherited from class java.lang.Object

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

Method Detail

compressColGroups

public static List<AColGroup> compressColGroups(MatrixBlock in,
                                                CompressedSizeInfo csi,
                                                CompressionSettings cs,
                                                int k)

The actual compression method, that handles the logic of compressing multiple columns together.

Parameters:

in - The input matrix, that could have been transposed. If it is transposed the compSettings should specify this.

csi - The compression information extracted from the estimation, this contains which groups of columns to compress together.

cs - The compression settings to specify how to compress.

k - The degree of parallelism to be used in the compression of the column groups.

Returns:

A resulting array of ColGroups, containing the compressed information from the input matrix block.

compressColGroups

public static List<AColGroup> compressColGroups(MatrixBlock in,
                                                CompressedSizeInfo csi,
                                                CompressionSettings cs,
                                                ACostEstimate ce,
                                                int k)

Parameters:

in - The input matrix, that could have been transposed. If it is transposed the compSettings should specify this.

csi - The compression information extracted from the estimation, this contains which groups of columns to compress together.

cs - The compression settings to specify how to compress.

ce - The cost estimator used for the compression

k - The degree of parallelism to be used in the compression of the column groups.

Returns:

A resulting array of ColGroups, containing the compressed information from the input matrix block.