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

Class AColGroupOffset

java.lang.Object

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

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

org.apache.sysds.runtime.compress.colgroup.AColGroupValue

org.apache.sysds.runtime.compress.colgroup.AColGroupOffset

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

ColGroupOLE, ColGroupRLE

public abstract class AColGroupOffset
extends AColGroupValue

Base class for column groups encoded with various types of bitmap encoding. NOTES: * OLE: separate storage segment length and bitmaps led to a 30% improvement but not applied because more difficult to support both data layouts at the same time (distributed/local as well as w/ and w/o low-level opt)

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
abstract void	countNonZerosPerRow(int[] rnnz, int rl, int ru)
long	estimateInMemorySize()	Get the upper bound estimate of in memory allocation for the column group.
int[]	getBitmapOffsets()
char[]	getBitmaps()
double	getCost(ComputationCostEstimator e, int nRows)	Get the computation cost associated with this column group.
long	getExactSizeOnDisk()	Returns the exact serialized size of column group.
boolean	hasZeros()
void	readFields(DataInput in)	Deserialize column group from data input.
String	toString()
void	write(DataOutput out)	Serializes column group to data output.

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

centralMoment, computeColSums, containsValue, copy, decompressToDenseBlock, decompressToSparseBlock, forceMatrixBlockDictionary, getCachedCounts, getCounts, getCounts, getDictionary, getNumberNonZeros, getNumValues, replace, rexpandCols, rightMultByMatrix

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

getMax, getMin, preAggRows, tsmm, unaryAggregateOperations, unaryAggregateOperations

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

binaryRowOpLeft, binaryRowOpRight, colSum, decompressToDenseBlock, decompressToSparseBlock, get, getColIndices, getCompType, getIdx, getNumCols, leftMultByAColGroup, leftMultByMatrixNoPreAgg, scalarOperation, shiftColIndices, sliceColumn, sliceColumns, tsmmAColGroup, unaryOperation

Methods inherited from class java.lang.Object

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

Method Detail

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.

getBitmaps

public char[] getBitmaps()

getBitmapOffsets

public int[] getBitmapOffsets()

hasZeros

public boolean hasZeros()

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from class: AColGroup

Deserialize column group from data input.

Overrides:

readFields in class AColGroupValue

Parameters:

in - data input

Throws:

IOException - if IOException occurs

write

public void write(DataOutput out)
           throws IOException

Description copied from class: AColGroup

Serializes column group to data output.

Overrides:

write in class AColGroupValue

Parameters:

out - data output

Throws:

IOException - if IOException occurs

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 AColGroupValue

Returns:

exact serialized size for column group

countNonZerosPerRow

public abstract void countNonZerosPerRow(int[] rnnz,
                                         int rl,
                                         int ru)

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

toString

public String toString()

Overrides:

toString in class AColGroupValue