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

Class AColGroupValue

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

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

AMorphingMMColGroup, APreAgg

public abstract class AColGroupValue
extends ADictBasedColGroup

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
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
long	estimateInMemorySize()	Get the upper bound estimate of in memory allocation for the column group.
int[]	getCounts()	Returns the counts of values inside the dictionary.
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.
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.
String	toString()

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

decompressToDenseBlock, decompressToSparseBlock, getDictionary, getExactSizeOnDisk, rightMultByMatrix, write

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

append, appendN, binaryRowOpLeft, binaryRowOpRight, colSum, containsValue, decompressToDenseBlock, decompressToSparseBlock, get, getColIndices, getCompressionScheme, getCompType, getCost, getIdx, getNumCols, leftMultByAColGroup, leftMultByMatrixNoPreAgg, rightMultByMatrix, scalarOperation, shiftColIndices, sliceColumn, sliceColumns, sliceRows, tsmmAColGroup, unaryOperation

Methods inherited from class java.lang.Object

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

Method Detail

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

getCounts

public final int[] getCounts()

Returns the counts of values inside the dictionary. If already calculated it will return the previous counts. This produce an overhead in cases where the count is calculated, but the overhead will be limited to number of distinct tuples in the dictionary. The returned counts always contains the number of zero tuples as well if there are some contained, even if they are not materialized.

Returns:

The count of each value in the MatrixBlock.

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.

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.

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 ADictBasedColGroup

Returns:

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

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.

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.

toString

public String toString()

Overrides:

toString in class AColGroup