org.apache.sysds.runtime.compress.colgroup

Class ColGroupConst

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.ColGroupConst

All Implemented Interfaces:

Serializable, Cloneable

public class ColGroupConst
extends ColGroupValue

See Also:

Serialized Form

Nested Class Summary

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

AColGroup.CompressionType

Constructor Summary

Constructors

Constructor and Description
ColGroupConst(int[] colIndices, int numRows, ADictionary dict) Constructs an Constant Colum Group, that contains only one tuple, with the given value.

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
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[] out)
int[]	getCounts(int rl, int ru, int[] out)
AColGroup	scalarOperation(ScalarOperator op) Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.

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

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

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

Constructor Detail

ColGroupConst

public ColGroupConst(int[] colIndices,
                     int numRows,
                     ADictionary dict)

Constructs an Constant Colum Group, that contains only one tuple, with the given value.

Parameters:

colIndices - The Colum indexes for the column group.

numRows - The number of rows contained in the group.

dict - The dictionary containing one tuple for the entire compression.

Method Detail

getCounts

public int[] getCounts(int[] out)

Specified by:

getCounts in class ColGroupValue

getCounts

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

Specified by:

getCounts in class ColGroupValue

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.

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

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