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

Class AColGroupCompressed

java.lang.Object

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

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

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

AColGroupValue, ColGroupConst, ColGroupEmpty

public abstract class AColGroupCompressed
extends AColGroup

Base class for column groups encoded Encoded in a compressed manner.

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
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.
double[]	preAggRows(AggregateUnaryOperator op)
void	tsmm(MatrixBlock ret, int nRows)	Do a transposed self matrix multiplication on the left side t(x) %*% x.
void	unaryAggregateOperations(AggregateUnaryOperator op, double[] c, int nRows, int rl, int ru)	Unary Aggregate operator, since aggregate operators require new object output, the output becomes an uncompressed matrix.
void	unaryAggregateOperations(AggregateUnaryOperator op, double[] c, int nRows, int rl, int ru, double[] preAgg)

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

binaryRowOpLeft, binaryRowOpRight, centralMoment, colSum, computeColSums, containsValue, copy, decompressToDenseBlock, decompressToDenseBlock, decompressToSparseBlock, decompressToSparseBlock, estimateInMemorySize, get, getColIndices, getCompType, getCost, getExactSizeOnDisk, getIdx, getNumberNonZeros, getNumCols, getNumValues, leftMultByAColGroup, leftMultByMatrixNoPreAgg, readFields, replace, rexpandCols, rightMultByMatrix, scalarOperation, shiftColIndices, sliceColumn, sliceColumns, toString, tsmmAColGroup, unaryOperation, write

Methods inherited from class java.lang.Object

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

Method Detail

preAggRows

public double[] preAggRows(AggregateUnaryOperator op)

getMin

public double getMin()

Description copied from class: AColGroup

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

Specified by:

getMin in class AColGroup

Returns:

The minimum value contained in this ColumnGroup

getMax

public double getMax()

Description copied from class: AColGroup

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

Specified by:

getMax in class AColGroup

Returns:

The maximum value contained in this ColumnGroup

unaryAggregateOperations

public final void unaryAggregateOperations(AggregateUnaryOperator op,
                                           double[] c,
                                           int nRows,
                                           int rl,
                                           int ru)

Description copied from class: AColGroup

Unary Aggregate operator, since aggregate operators require new object output, the output becomes an uncompressed matrix.

Specified by:

unaryAggregateOperations in class AColGroup

Parameters:

op - The operator used

c - The output matrix block

nRows - The total number of rows in the Column Group

rl - The Starting Row to do aggregation from

ru - The last Row to do aggregation to (not included)

unaryAggregateOperations

public final void unaryAggregateOperations(AggregateUnaryOperator op,
                                           double[] c,
                                           int nRows,
                                           int rl,
                                           int ru,
                                           double[] preAgg)

tsmm

public final void tsmm(MatrixBlock ret,
                       int nRows)

Description copied from class: AColGroup

Do a transposed self matrix multiplication on the left side t(x) %*% x. but only with this column group. This gives better performance since there is no need to iterate through all the rows of the matrix, but the execution can be limited to its number of distinct values. Note it only calculate the upper triangle

Specified by:

tsmm in class AColGroup

Parameters:

ret - The return matrix block [numColumns x numColumns]

nRows - The number of rows in the column group