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

Class ColGroupDDCFOR

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.AMorphingMMColGroup

org.apache.sysds.runtime.compress.colgroup.ColGroupDDCFOR

All Implemented Interfaces:

Serializable

public class ColGroupDDCFOR
extends AMorphingMMColGroup

Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC).

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)
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.
CM_COV_Object	centralMoment(CMOperator op, int nRows)	Central Moment instruction executed on a column group.
void	computeColSums(double[] c, int nRows)	Compute the column sum
boolean	containsValue(double pattern)	Detect if the column group contains a specific value.
static AColGroup	create(IColIndex colIndexes, ADictionary dict, AMapToData data, int[] cachedCounts, double[] reference)
long	estimateInMemorySize()	Get the upper bound estimate of in memory allocation for the column group.
AColGroup	extractCommon(double[] constV)	extract common value from group and return non morphing group
org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType	getColGroupType()
double[]	getCommon()	Get common vector, note this should not materialize anything but simply point to things that are already allocated.
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)
long	getExactSizeOnDisk()	Returns the exact serialized size of column group.
double	getIdx(int r, int colIdx)	Get the value at a colGroup specific row/column index position.
long	getNumberNonZeros(int nRows)	Get the number of nonZeros contained in this column group.
static ColGroupDDCFOR	read(DataInput in)
AColGroup	replace(double pattern, double replace)	Make a copy of the column group values, and replace all values that match pattern with replacement value.
AColGroup	rexpandCols(int max, boolean ignore, boolean cast, int nRows)	Expand the column group to multiple columns.
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.
static AColGroup	sparsifyFOR(ColGroupDDC g)
String	toString()
AColGroup	unaryOperation(UnaryOperator op)	Perform unary operation on the column group and return a new column group
void	write(DataOutput out)

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

leftMultByAColGroup, leftMultByMatrixNoPreAgg, tsmmAColGroup

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

getCounts, getNumValues

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

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

appendN, colSum, decompressToDenseBlock, decompressToSparseBlock, get, getColIndices, getNumCols, rightMultByMatrix, shiftColIndices, sliceColumn, sliceColumns

Methods inherited from class java.lang.Object

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

Method Detail

create

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

sparsifyFOR

public static AColGroup sparsifyFOR(ColGroupDDC g)

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.

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

getCounts

public int[] getCounts(int[] counts)

getColGroupType

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

estimateInMemorySize

public long estimateInMemorySize()

Description copied from class: AColGroup

Get the upper bound estimate of in memory allocation for the column group.

Overrides:

estimateInMemorySize in class AColGroupValue

Returns:

an upper bound on the number of bytes used to store this ColGroup in memory.

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, should be same length as dictionary length.

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, should be same length as dictionary length.

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.

write

public void write(DataOutput out)
           throws IOException

Overrides:

write in class ADictBasedColGroup

Throws:

IOException

read

public static ColGroupDDCFOR read(DataInput in)
                           throws IOException

Throws:

IOException

getExactSizeOnDisk

public long getExactSizeOnDisk()

Description copied from class: AColGroup

Returns the exact serialized size of column group. This can be used for example for buffer preallocation.

Overrides:

getExactSizeOnDisk in class ADictBasedColGroup

Returns:

exact serialized size for column group

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

replace

public AColGroup replace(double pattern,
                         double replace)

Description copied from class: AColGroup

Make a copy of the column group values, and replace all values that match pattern with replacement value.

Overrides:

replace in class AColGroupValue

Parameters:

pattern - The value to look for

replace - The value to replace the other value with

Returns:

A new Column Group, reusing the index structure but with new values.

computeColSums

public void computeColSums(double[] c,
                           int nRows)

Description copied from class: AColGroup

Compute the column sum

Overrides:

computeColSums in class AColGroupValue

Parameters:

c - The array to add the column sum to.

nRows - The number of rows in the column group.

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.

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.

extractCommon

public AColGroup extractCommon(double[] constV)

Description copied from class: AMorphingMMColGroup

extract common value from group and return non morphing group

Specified by:

extractCommon in class AMorphingMMColGroup

Parameters:

constV - a vector to contain all values, note length = nCols in total matrix.

Returns:

A non morphing column group with decompression instructions.

rexpandCols

public AColGroup rexpandCols(int max,
                             boolean ignore,
                             boolean cast,
                             int nRows)

Description copied from class: AColGroup

Expand the column group to multiple columns. (one hot encode the column group)

Overrides:

rexpandCols in class AColGroupValue

Parameters:

max - The number of columns to expand to and cutoff values at.

ignore - If zero and negative values should be ignored.

cast - If the double values contained should be cast to whole numbers.

nRows - The number of rows in the column group.

Returns:

A new column group containing max number of columns.

centralMoment

public CM_COV_Object centralMoment(CMOperator op,
                                   int nRows)

Description copied from class: AColGroup

Central Moment instruction executed on a column group.

Overrides:

centralMoment in class AColGroupValue

Parameters:

op - The Operator to use.

nRows - The number of rows contained in the ColumnGroup.

Returns:

A Central Moment object.

getCommon

public double[] getCommon()

Description copied from class: AMorphingMMColGroup

Get common vector, note this should not materialize anything but simply point to things that are already allocated.

Specified by:

getCommon in class AMorphingMMColGroup

Returns:

the common double vector

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)

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

toString

public String toString()

Overrides:

toString in class AColGroupValue