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

Class ColGroupEmpty

java.lang.Object

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

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

org.apache.sysds.runtime.compress.colgroup.ColGroupEmpty

All Implemented Interfaces:

Serializable

public class ColGroupEmpty
extends AColGroupCompressed

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	Description
ColGroupEmpty(int[] colIndices)	Constructs an Constant Colum Group, that contains only one tuple, with the given value.

Method Summary

Modifier and Type	Method	Description
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.
AColGroup	copy()	Get a copy of this column group note this is only a shallow copy.
static ColGroupEmpty	create(int nCol)
void	decompressToDenseBlock(DenseBlock target, int rl, int ru, int offR, int offC)	Decompress into the DenseBlock.
void	decompressToSparseBlock(SparseBlock sb, int rl, int ru, int offR, int offC)	Decompress into the SparseBlock.
org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType	getColGroupType()
AColGroup.CompressionType	getCompType()	Obtain the compression type.
double	getCost(ComputationCostEstimator e, int nRows)	Get the computation cost associated with this column group.
double	getIdx(int r, int colIdx)	Get the value at a colGroup specific row/column index position.
double	getMax()	Short hand method for getting maximum value contained in this column group.
double	getMin()	Short hand method for getting minimum value contained in this column group.
long	getNumberNonZeros(int nRows)	Get the number of nonZeros contained in this column group.
int	getNumValues()	Obtain number of distinct tuples in contained sets of values associated with this column group.
void	leftMultByAColGroup(AColGroup lhs, MatrixBlock c)	Left side matrix multiplication with a column group that is transposed.
void	leftMultByMatrixNoPreAgg(MatrixBlock matrix, MatrixBlock result, int rl, int ru, int cl, int cu)	Left multiply with this column group.
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	rightMultByMatrix(MatrixBlock right)	Right matrix multiplication with this column group.
AColGroup	scalarOperation(ScalarOperator op)	Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.
void	tsmmAColGroup(AColGroup other, MatrixBlock result)	Matrix multiply with this other column group, but: 1.
AColGroup	unaryOperation(UnaryOperator op)

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

preAggRows, tsmm, unaryAggregateOperations, unaryAggregateOperations

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

colSum, decompressToDenseBlock, decompressToSparseBlock, estimateInMemorySize, get, getColIndices, getExactSizeOnDisk, getNumCols, readFields, shiftColIndices, sliceColumn, sliceColumns, toString, write

Methods inherited from class java.lang.Object

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

Constructor Detail

ColGroupEmpty

public ColGroupEmpty(int[] colIndices)

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

Parameters:

colIndices - The Colum indexes for the column group.

Method Detail

create

public static ColGroupEmpty create(int nCol)

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()

decompressToDenseBlock

public void decompressToDenseBlock(DenseBlock target,
                                   int rl,
                                   int ru,
                                   int offR,
                                   int offC)

Description copied from class: AColGroup

Decompress into the DenseBlock. (no NNZ handling)

Specified by:

decompressToDenseBlock in class AColGroup

Parameters:

target - Target DenseBlock

rl - Row to start decompression from

ru - Row to end decompression at

offR - Row offset into the target to decompress

offC - Column offset into the target to decompress

decompressToSparseBlock

public void decompressToSparseBlock(SparseBlock sb,
                                    int rl,
                                    int ru,
                                    int offR,
                                    int offC)

Description copied from class: AColGroup

Decompress into the SparseBlock. (no NNZ handling) Note this method is allowing to calls to append since it is assumed that the sparse column indexes are sorted afterwards

Specified by:

decompressToSparseBlock in class AColGroup

Parameters:

sb - Target SparseBlock

rl - Row to start decompression from

ru - Row to end decompression at

offR - Row offset into the target to decompress

offC - Column offset into the target to decompress

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

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)

Specified by:

unaryOperation in class AColGroup

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.

getNumValues

public int getNumValues()

Description copied from class: AColGroup

Obtain number of distinct tuples in contained sets of values associated with this column group. If the column group is uncompressed the number or rows is returned.

Specified by:

getNumValues in class AColGroup

Returns:

the number of distinct sets of values associated with the bitmaps in this column group

leftMultByAColGroup

public void leftMultByAColGroup(AColGroup lhs,
                                MatrixBlock c)

Description copied from class: AColGroup

Left side matrix multiplication with a column group that is transposed.

Specified by:

leftMultByAColGroup in class AColGroup

Parameters:

lhs - The left hand side Column group to multiply with, the left hand side should be considered transposed.

c - The result matrix to insert the result of the multiplication into

tsmmAColGroup

public void tsmmAColGroup(AColGroup other,
                          MatrixBlock result)

Description copied from class: AColGroup

Matrix multiply with this other column group, but: 1. Only output upper triangle values. 2. Multiply both ways with "this" being on the left and on the right. It should be guaranteed that the input is not the same as the caller of the method. The second step is achievable by treating the initial multiplied matrix, and adding its values to the correct locations in the output.

Specified by:

tsmmAColGroup in class AColGroup

Parameters:

other - The other Column group to multiply with

result - The result matrix to put the results into

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

copy

public AColGroup copy()

Description copied from class: AColGroup

Get a copy of this column group note this is only a shallow copy. Meaning only the object wrapping index structures, column indexes and dictionaries are copied.

Specified by:

copy in class AColGroup

Returns:

Get a copy of this 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.

Specified by:

getNumberNonZeros in class AColGroup

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.

rightMultByMatrix

public AColGroup rightMultByMatrix(MatrixBlock right)

Description copied from class: AColGroup

Right matrix multiplication with this column group. This method can return null, meaning that the output overlapping group would have been empty.

Specified by:

rightMultByMatrix in class AColGroup

Parameters:

right - The MatrixBlock on the right of this matrix multiplication

Returns:

The new Column Group or null that is the result of the matrix multiplication.

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.

Specified by:

replace in class AColGroup

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.

getMin

public final double getMin()

Description copied from class: AColGroup

Short hand method for getting minimum value contained in this column group.

Overrides:

getMin in class AColGroupCompressed

Returns:

The minimum value contained in this ColumnGroup

getMax

public final double getMax()

Description copied from class: AColGroup

Short hand method for getting maximum value contained in this column group.

Overrides:

getMax in class AColGroupCompressed

Returns:

The maximum value contained in this ColumnGroup

computeColSums

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

Description copied from class: AColGroup

Compute the column sum

Specified by:

computeColSums in class AColGroup

Parameters:

c - The array to add the column sum to.

nRows - The number of rows in the column group.

centralMoment

public CM_COV_Object centralMoment(CMOperator op,
                                   int nRows)

Description copied from class: AColGroup

Central Moment instruction executed on a column group.

Specified by:

centralMoment in class AColGroup

Parameters:

op - The Operator to use.

nRows - The number of rows contained in the ColumnGroup.

Returns:

A Central Moment object.

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)

Specified by:

rexpandCols in class AColGroup

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.

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