Package org.apache.sysds.runtime.compress.estim.encoding

Class ConstEncoding

java.lang.Object

org.apache.sysds.runtime.compress.estim.encoding.ConstEncoding

All Implemented Interfaces:

IEncode

public class ConstEncoding
extends Object
implements IEncode

Const encoding for cases where the entire group of columns is the same value

Field Summary

Fields inherited from interface org.apache.sysds.runtime.compress.estim.encoding.IEncode

LOG

Method Summary

Modifier and Type	Method	Description
IEncode	combine(IEncode e)	Combine two encodings, note it should be guaranteed by the caller that the number of unique multiplied does not overflow Integer.
EstimationFactors	extractFacts(int nRows, double tupleSparsity, double matrixSparsity, CompressionSettings cs)	Extract the compression facts for this column group.
int	getUnique()	Get the number of unique values in this encoding
boolean	isDense()	Signify if the counts are including zero or without zero.
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

combine

public IEncode combine(IEncode e)

Description copied from interface: IEncode

Combine two encodings, note it should be guaranteed by the caller that the number of unique multiplied does not overflow Integer.

Specified by:

combine in interface IEncode

Parameters:

e - The other side to combine with

Returns:

The combined encoding

getUnique

public int getUnique()

Description copied from interface: IEncode

Get the number of unique values in this encoding

Specified by:

getUnique in interface IEncode

Returns:

The number of unique values.

toString

public String toString()

Overrides:

toString in class Object

extractFacts

public EstimationFactors extractFacts(int nRows,
                                      double tupleSparsity,
                                      double matrixSparsity,
                                      CompressionSettings cs)

Description copied from interface: IEncode

Extract the compression facts for this column group.

Specified by:

extractFacts in interface IEncode

Parameters:

nRows - The total number of rows

tupleSparsity - The Sparsity of the unique tuples

matrixSparsity - The matrix sparsity

cs - The compression settings

Returns:

A EstimationFactors object

isDense

public boolean isDense()

Description copied from interface: IEncode

Signify if the counts are including zero or without zero.

Specified by:

isDense in interface IEncode

Returns:

is dense