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

Class ColGroupDeltaDDC

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.ColGroupDDC

org.apache.sysds.runtime.compress.colgroup.ColGroupDeltaDDC

All Implemented Interfaces:

Serializable, IContainADictionary, IMapToDataGroup

public class ColGroupDeltaDDC
extends ColGroupDDC

Class to encapsulate information about a column group that is first delta encoded then encoded with dense dictionary encoding (DeltaDDC).

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)
boolean	containsValue(double pattern)	Detect if the column group contains a specific value.
static AColGroup	create(IColIndex colIndexes, IDictionary dict, AMapToData data, int[] cachedCounts)
org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType	getColGroupType()
AColGroup.CompressionType	getCompType()	Obtain the compression type.
long	getNumberNonZeros(int nRows)	Get the number of nonZeros contained in this column group.
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, int cl, int cu)
void	preAggregateThatDDCStructure(ColGroupDDC that, Dictionary ret)
void	preAggregateThatSDCSingleZerosStructure(ColGroupSDCSingleZeros that, Dictionary ret)
void	preAggregateThatSDCZerosStructure(ColGroupSDCZeros that, Dictionary ret)
static ColGroupDeltaDDC	read(DataInput in)
void	rightDecompressingMult(MatrixBlock right, MatrixBlock ret, int rl, int ru, int nRows, int crl, int cru)	Right side Matrix multiplication, iterating though this column group and adding to the ret
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.
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.ColGroupDDC

binaryRowOpLeft, binaryRowOpRight, combineWithSameIndex, combineWithSameIndex, convertToDDCLZW, convertToDeltaDDC, estimateInMemorySize, getCompressionInfo, getCompressionScheme, getCost, getCounts, getEncoding, getExactSizeOnDisk, getIdx, getMapToData, leftMMIdentityPreAggregateDense, morph, recompress, removeEmptyRows, sameIndexStructure, sort, sparseSelection, sparsifyFOR, splitReshape, splitReshapePushDown, toString, 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, getNumValues, replace, rexpandCols

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

copyAndSet, copyAndSet, decompressToDenseBlock, decompressToDenseBlockTransposed, decompressToSparseBlock, decompressToSparseBlockTransposed, getDictionary, getSparsity, reduceCols, rightMultByMatrix

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

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

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

addVector, appendN, colSum, combine, decompressToDenseBlock, decompressToSparseBlock, get, getColIndices, getNumCols, removeEmptyCols, rightMultByMatrix, selectionMultiply, shiftColIndices, sliceColumn, sliceColumns, sortColumnIndexes

Methods inherited from class java.lang.Object

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

Method Details

create

public static AColGroup create(IColIndex colIndexes,
 IDictionary dict,
 AMapToData data,
 int[] cachedCounts)

getCompType

public AColGroup.CompressionType getCompType()

Description copied from class: AColGroup

Obtain the compression type.

Overrides:

getCompType in class ColGroupDDC

Returns:

How the elements of the column group are compressed.

getColGroupType

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

Overrides:

getColGroupType in class ColGroupDDC

read

public static ColGroupDeltaDDC read(DataInput in)
                             throws IOException

Throws:

IOException

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.

Overrides:

scalarOperation in class ColGroupDDC

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

Overrides:

unaryOperation in class ColGroupDDC

Parameters:

op - The operation to perform

Returns:

The new column group

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.

Overrides:

leftMultByMatrixNoPreAgg in class ColGroupDDC

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

rightDecompressingMult

public void rightDecompressingMult(MatrixBlock right,
 MatrixBlock ret,
 int rl,
 int ru,
 int nRows,
 int crl,
 int cru)

Description copied from class: AColGroup

Right side Matrix multiplication, iterating though this column group and adding to the ret

Overrides:

rightDecompressingMult in class ColGroupDDC

Parameters:

right - Right side matrix to multiply with.

ret - The return matrix to add results to

rl - The row of this column group to multiply from

ru - The row of this column group to multiply to (not inclusive)

nRows - The number of rows in this column group

crl - The right hand side column lower

cru - The right hand side column upper

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)

Overrides:

preAggregateDense in class ColGroupDDC

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,
 int cl,
 int cu)

Overrides:

preAggregateSparse in class ColGroupDDC

preAggregateThatDDCStructure

public void preAggregateThatDDCStructure(ColGroupDDC that,
 Dictionary ret)

Overrides:

preAggregateThatDDCStructure in class ColGroupDDC

preAggregateThatSDCZerosStructure

public void preAggregateThatSDCZerosStructure(ColGroupSDCZeros that,
 Dictionary ret)

Overrides:

preAggregateThatSDCZerosStructure in class ColGroupDDC

preAggregateThatSDCSingleZerosStructure

public void preAggregateThatSDCSingleZerosStructure(ColGroupSDCSingleZeros that,
 Dictionary ret)

Overrides:

preAggregateThatSDCSingleZerosStructure in class ColGroupDDC

containsValue

public boolean containsValue(double pattern)

Description copied from class: AColGroup

Detect if the column group contains a specific value.

Overrides:

containsValue in class ColGroupDDC

Parameters:

pattern - The value to look for.

Returns:

boolean saying true if the value is contained.

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.

Overrides:

append in class ColGroupDDC

Parameters:

g - The other column group

Returns:

A combined column group or null

appendNInternal

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

Overrides:

appendNInternal in class ColGroupDDC

getNumberNonZeros

public long getNumberNonZeros(int nRows)

Description copied from class: AColGroup

Get the number of nonZeros contained in this column group.

Overrides:

getNumberNonZeros in class AColGroupValue

Parameters:

nRows - The number of rows in the column group, this is used for groups that does not contain information about how many rows they have.

Returns:

The nnz.

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.

Overrides:

sliceRows in class ColGroupDDC

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.