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

Class ConstEncoding

java.lang.Object

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

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

All Implemented Interfaces:

IEncode

public class ConstEncoding
extends AEncode

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.
org.apache.commons.lang3.tuple.Pair<IEncode,HashMapLongInt>	combineWithMap(IEncode e)	Combine two encodings without resizing the output.
boolean	equals(IEncode e)	Indicate if the given encoding is equivalent to this encoding
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 org.apache.sysds.runtime.compress.estim.encoding.AEncode

equals

Methods inherited from class java.lang.Object

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

Method Details

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.

Parameters:

e - The other side to combine with

Returns:

The combined encoding

combineWithMap

public org.apache.commons.lang3.tuple.Pair<IEncode,HashMapLongInt> combineWithMap(IEncode e)

Description copied from interface: IEncode

Combine two encodings without resizing the output. meaning the mapping of the indexes should be consistent with left hand side Dictionary indexes and right hand side indexes.

NOTE: Require both encodings to contain the correct metadata for number of unique values.

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

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.

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.

Returns:

is dense

equals

public boolean equals(IEncode e)

Description copied from interface: IEncode

Indicate if the given encoding is equivalent to this encoding

Parameters:

e - The other encoding to be compared with this

Returns:

If the encoding is equivalent