org.apache.sysds.runtime.compress.colgroup

Class ColGroupOLE

java.lang.Object

org.apache.sysds.runtime.compress.colgroup.AColGroup

org.apache.sysds.runtime.compress.colgroup.ColGroupCompressed

org.apache.sysds.runtime.compress.colgroup.ColGroupValue

org.apache.sysds.runtime.compress.colgroup.ColGroupOffset

org.apache.sysds.runtime.compress.colgroup.ColGroupOLE

All Implemented Interfaces:

Serializable, Cloneable

public class ColGroupOLE
extends ColGroupOffset

Class to encapsulate information about a column group that is encoded with simple lists of offsets for each set of distinct values.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroup

AColGroup.CompressionType

Method Summary

Modifier and Type	Method and Description
AColGroup	binaryRowOp(BinaryOperator op, double[] v, boolean sparseSafe, boolean left) Perform a binary row operation.
void	countNonZerosPerRow(int[] rnnz, int rl, int ru) Count the number of non-zeros per row
static char[]	genOffsetBitmap(int[] offsets, int len) Encodes the bitmap in blocks of offsets.
double	get(int r, int c) Get the value at a global row/column position.
org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType	getColGroupType() Internally get the specific type of ColGroup, this could be extracted from the object but that does not allow for nice switches in the code.
AColGroup.CompressionType	getCompType() Obtain the compression type.
int[]	getCounts(int[] counts)
int[]	getCounts(int rl, int ru, int[] counts)
int	getIndexStructureHash()
Dictionary	preAggregateThatDDCStructure(ColGroupDDC that, Dictionary ret)
Dictionary	preAggregateThatSDCSingleStructure(ColGroupSDCSingle that, Dictionary ret, boolean preModified)
Dictionary	preAggregateThatSDCSingleZerosStructure(ColGroupSDCSingleZeros that, Dictionary ret)
Dictionary	preAggregateThatSDCStructure(ColGroupSDC that, Dictionary ret, boolean preModified)
Dictionary	preAggregateThatSDCZerosStructure(ColGroupSDCZeros that, Dictionary ret)
boolean	sameIndexStructure(ColGroupCompressed that)
AColGroup	scalarOperation(ScalarOperator op) Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.
String	toString()

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.ColGroupOffset

estimateInMemorySize, getBitmapOffsets, getBitmaps, getExactSizeOnDisk, hasZeros, readFields, write

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.ColGroupValue

addMinMax, cleanupThreadLocalMemory, containsValue, copy, copyAndSet, copyAndSet, copyAndSet, copyAndSet, decompressToBlockSafe, decompressToBlockUnSafe, getCachedCounts, getCounts, getCounts, getDictionary, getIfCountsType, getNumberNonZeros, getNumValues, getValues, getValuesAsBlock, isDense, isLossy, leftMultByAColGroup, leftMultByMatrix, preAggregateThatIndexStructure, replace, rightMultByMatrix, setupThreadLocalMemory, tsmm, tsmm

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.ColGroupCompressed

getMax, getMin, getNumRows, unaryAggregateOperations, unaryAggregateOperations

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroup

decompressColumnToBlockUnSafe, decompressToBlockUnSafe, getColIndices, getNumCols, leftMultByMatrix, shiftColIndices, sliceColumn, sliceColumns

Methods inherited from class java.lang.Object

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

Method Detail

getCompType

public AColGroup.CompressionType getCompType()

Description copied from class: AColGroup

Obtain the compression type.

Specified by:

getCompType in class AColGroup

Returns:

How the elements of the column group are compressed.

getColGroupType

public org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType getColGroupType()

Description copied from class: AColGroup

Internally get the specific type of ColGroup, this could be extracted from the object but that does not allow for nice switches in the code.

Returns:

ColGroupType of the object.

getCounts

public int[] getCounts(int[] counts)

Specified by:

getCounts in class ColGroupValue

getCounts

public int[] getCounts(int rl,
                       int ru,
                       int[] counts)

Specified by:

getCounts in class ColGroupValue

scalarOperation

public AColGroup scalarOperation(ScalarOperator op)

Description copied from class: AColGroup

Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.

Specified by:

scalarOperation in class AColGroup

Parameters:

op - operation to perform

Returns:

version of this column group with the operation applied

binaryRowOp

public AColGroup binaryRowOp(BinaryOperator op,
                             double[] v,
                             boolean sparseSafe,
                             boolean left)

Description copied from class: AColGroup

Perform a binary row operation.

Specified by:

binaryRowOp in class AColGroup

Parameters:

op - The operation to execute

v - The vector of values to apply, should be same length as dictionary length.

sparseSafe - True if the operation return 0 on all instances of values in v -- op(v[?], 0)

left - Specifies if the operation is executed on the left or right side of the values contained.

Returns:

A updated column group with the new values.

countNonZerosPerRow

public void countNonZerosPerRow(int[] rnnz,
                                int rl,
                                int ru)

Description copied from class: AColGroup

Count the number of non-zeros per row

Specified by:

countNonZerosPerRow in class AColGroup

Parameters:

rnnz - non-zeros per row

rl - row lower bound, inclusive

ru - row upper bound, exclusive

get

public double get(int r,
                  int c)

Description copied from class: AColGroup

Get the value at a global row/column position.

Specified by:

get in class AColGroup

Parameters:

r - row

c - column

Returns:

value at the row/column position

toString

public String toString()

Overrides:

toString in class ColGroupOffset

sameIndexStructure

public boolean sameIndexStructure(ColGroupCompressed that)

getIndexStructureHash

public int getIndexStructureHash()

genOffsetBitmap

public static char[] genOffsetBitmap(int[] offsets,
                                     int len)

Encodes the bitmap in blocks of offsets. Within each block, the bits are stored as absolute offsets from the start of the block.

Parameters:

offsets - uncompressed offset list

len - logical length of the given offset list

Returns:

compressed version of said bitmap

preAggregateThatDDCStructure

public Dictionary preAggregateThatDDCStructure(ColGroupDDC that,
                                               Dictionary ret)

preAggregateThatSDCStructure

public Dictionary preAggregateThatSDCStructure(ColGroupSDC that,
                                               Dictionary ret,
                                               boolean preModified)

preAggregateThatSDCZerosStructure

public Dictionary preAggregateThatSDCZerosStructure(ColGroupSDCZeros that,
                                                    Dictionary ret)

preAggregateThatSDCSingleZerosStructure

public Dictionary preAggregateThatSDCSingleZerosStructure(ColGroupSDCSingleZeros that,
                                                          Dictionary ret)

preAggregateThatSDCSingleStructure

public Dictionary preAggregateThatSDCSingleStructure(ColGroupSDCSingle that,
                                                     Dictionary ret,
                                                     boolean preModified)