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

Class ColGroupOLE

java.lang.Object

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

org.apache.sysds.runtime.compress.colgroup.AColGroupCompressed

org.apache.sysds.runtime.compress.colgroup.ADictBasedColGroup

org.apache.sysds.runtime.compress.colgroup.AColGroupValue

org.apache.sysds.runtime.compress.colgroup.APreAgg

org.apache.sysds.runtime.compress.colgroup.AColGroupOffset

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

All Implemented Interfaces:

Serializable, IContainADictionary

public class ColGroupOLE
extends AColGroupOffset

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	Description
AColGroup	append(AColGroup g)	Append the other column group to this column group.
AColGroup	appendNInternal(AColGroup[] g, int blen, int rlen)
AColGroup	binaryRowOpLeft(BinaryOperator op, double[] v, boolean isRowSafe)	Perform a binary row operation.
AColGroup	binaryRowOpRight(BinaryOperator op, double[] v, boolean isRowSafe)	Perform a binary row operation.
boolean	containsValue(double pattern)	Detect if the column group contains a specific value.
static char[]	genOffsetBitmap(int[] offsets, int len)	Encodes the bitmap in blocks of offsets.
org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType	getColGroupType()
CompressedSizeInfoColGroup	getCompressionInfo(int nRow)	Get the compression info for this column group.
ICLAScheme	getCompressionScheme()	Get the compression scheme for this column group to enable compression of other data.
AColGroup.CompressionType	getCompType()	Obtain the compression type.
double	getCost(ComputationCostEstimator e, int nRows)	Get the computation cost associated with this column group.
int[]	getCounts(int[] counts)
double	getIdx(int r, int colIdx)	Get the value at a colGroup specific row/column index position.
void	leftMultByMatrixNoPreAgg(MatrixBlock matrix, MatrixBlock result, int rl, int ru, int cl, int cu)	Left multiply with this column group.
void	preAggregateDense(MatrixBlock m, double[] preAgg, int rl, int ru, int cl, int cu)	Pre aggregate a dense matrix block into a pre aggregate target (first step of left matrix multiplication)
void	preAggregateSparse(SparseBlock sb, double[] preAgg, int rl, int ru)
static ColGroupOLE	read(DataInput in, int nRows)
AColGroup	recompress()	Recompress this column group into a new column group.
boolean	sameIndexStructure(AColGroupCompressed that)
AColGroup	scalarOperation(ScalarOperator op)	Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.
AColGroup	sliceRows(int rl, int ru)	Slice range of rows out of the column group and return a new column group only containing the row segment.
String	toString()
AColGroup	unaryOperation(UnaryOperator op)	Perform unary operation on the column group and return a new column group

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

containZerosTuples, estimateInMemorySize, getExactSizeOnDisk, readData, readPointers, write

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

getPreAggregateSize, leftMultByAColGroup, mmWithDictionary, preAggregate, preAggregateThatIndexStructure, tsmmAColGroup

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

centralMoment, clear, computeColSums, getCounts, getNumberNonZeros, getNumValues, replace, rexpandCols

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

copyAndSet, copyAndSet, decompressToDenseBlock, decompressToSparseBlock, getDictionary, rightMultByMatrix

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

getMax, getMin, getSum, isEmpty, preAggRows, tsmm, unaryAggregateOperations, unaryAggregateOperations

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

addVector, appendN, colSum, combine, decompressToDenseBlock, decompressToSparseBlock, get, getColIndices, getEncoding, getNumCols, morph, rightMultByMatrix, shiftColIndices, sliceColumn, sliceColumns, sortColumnIndexes

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()

getCounts

public int[] getCounts(int[] counts)

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

unaryOperation

public AColGroup unaryOperation(UnaryOperator op)

Description copied from class: AColGroup

Perform unary operation on the column group and return a new column group

Specified by:

unaryOperation in class AColGroup

Parameters:

op - The operation to perform

Returns:

The new column group

binaryRowOpLeft

public AColGroup binaryRowOpLeft(BinaryOperator op,
                                 double[] v,
                                 boolean isRowSafe)

Description copied from class: AColGroup

Perform a binary row operation.

Specified by:

binaryRowOpLeft in class AColGroup

Parameters:

op - The operation to execute

v - The vector of values to apply the values contained should be at least the length of the highest value in the column index

isRowSafe - True if the binary op is applied to an entire zero row and all results are zero

Returns:

A updated column group with the new values.

binaryRowOpRight

public AColGroup binaryRowOpRight(BinaryOperator op,
                                  double[] v,
                                  boolean isRowSafe)

Description copied from class: AColGroup

Perform a binary row operation.

Specified by:

binaryRowOpRight in class AColGroup

Parameters:

op - The operation to execute

v - The vector of values to apply the values contained should be at least the length of the highest value in the column index

isRowSafe - True if the binary op is applied to an entire zero row and all results are zero

Returns:

A updated column group with the new values.

getIdx

public double getIdx(int r,
                     int colIdx)

Description copied from class: AColGroup

Get the value at a colGroup specific row/column index position.

Specified by:

getIdx in class AColGroup

Parameters:

r - row

colIdx - column index in the _colIndexes.

Returns:

value at the row/column index position

leftMultByMatrixNoPreAgg

public void leftMultByMatrixNoPreAgg(MatrixBlock matrix,
                                     MatrixBlock result,
                                     int rl,
                                     int ru,
                                     int cl,
                                     int cu)

Description copied from class: AColGroup

Left multiply with this column group.

Specified by:

leftMultByMatrixNoPreAgg in class AColGroup

Parameters:

matrix - The matrix to multiply with on the left

result - The result to output the values into, always dense for the purpose of the column groups parallelizing

rl - The row to begin the multiplication from on the lhs matrix

ru - The row to end the multiplication at on the lhs matrix

cl - The column to begin the multiplication from on the lhs matrix

cu - The column to end the multiplication at on the lhs matrix

containsValue

public boolean containsValue(double pattern)

Description copied from class: AColGroup

Detect if the column group contains a specific value.

Specified by:

containsValue in class AColGroup

Parameters:

pattern - The value to look for.

Returns:

boolean saying true if the value is contained.

toString

public String toString()

Overrides:

toString in class AColGroupValue

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

preAggregateDense

public void preAggregateDense(MatrixBlock m,
                              double[] preAgg,
                              int rl,
                              int ru,
                              int cl,
                              int cu)

Description copied from class: APreAgg

Pre aggregate a dense matrix block into a pre aggregate target (first step of left matrix multiplication)

Specified by:

preAggregateDense in class APreAgg

Parameters:

m - The matrix to preAggregate

preAgg - The preAggregate target

rl - Row lower on the left side matrix

ru - Row upper on the left side matrix

cl - Column lower on the left side matrix (or row lower in the column group)

cu - Column upper on the left side matrix (or row upper in the column group)

preAggregateSparse

public void preAggregateSparse(SparseBlock sb,
                               double[] preAgg,
                               int rl,
                               int ru)

Specified by:

preAggregateSparse in class APreAgg

sameIndexStructure

public boolean sameIndexStructure(AColGroupCompressed that)

Specified by:

sameIndexStructure in class AColGroupCompressed

getCost

public double getCost(ComputationCostEstimator e,
                      int nRows)

Description copied from class: AColGroup

Get the computation cost associated with this column group.

Specified by:

getCost in class AColGroup

Parameters:

e - The computation cost estimator

nRows - the number of rows in the column group

Returns:

The cost of this column group

read

public static ColGroupOLE read(DataInput in,
                               int nRows)
                        throws IOException

Throws:

IOException

sliceRows

public AColGroup sliceRows(int rl,
                           int ru)

Description copied from class: AColGroup

Slice range of rows out of the column group and return a new column group only containing the row segment. Note that this slice should maintain pointers back to the original dictionaries and only modify index structures.

Specified by:

sliceRows in class AColGroup

Parameters:

rl - The row to start at

ru - The row to end at (not included)

Returns:

A new column group containing the specified row range.

append

public AColGroup append(AColGroup g)

Description copied from class: AColGroup

Append the other column group to this column group. This method tries to combine them to return a new column group containing both. In some cases it is possible in reasonable time, in others it is not. The result is first this column group followed by the other column group in higher row values. If it is not possible or very inefficient null is returned.

Specified by:

append in class AColGroup

Parameters:

g - The other column group

Returns:

A combined column group or null

appendNInternal

public AColGroup appendNInternal(AColGroup[] g,
                                 int blen,
                                 int rlen)

getCompressionScheme

public ICLAScheme getCompressionScheme()

Description copied from class: AColGroup

Get the compression scheme for this column group to enable compression of other data.

Specified by:

getCompressionScheme in class AColGroup

Returns:

The compression scheme of this column group

recompress

public AColGroup recompress()

Description copied from class: AColGroup

Recompress this column group into a new column group.

Specified by:

recompress in class AColGroup

Returns:

A new or the same column group depending on optimization goal.

getCompressionInfo

public CompressedSizeInfoColGroup getCompressionInfo(int nRow)

Description copied from class: AColGroup

Get the compression info for this column group.

Specified by:

getCompressionInfo in class AColGroup

Parameters:

nRow - The number of rows in this column group.

Returns:

The compression info for this group.