org.apache.sysds.runtime.compress.colgroup

Class ColGroupDDC1

java.lang.Object

org.apache.sysds.runtime.compress.colgroup.ColGroup

org.apache.sysds.runtime.compress.colgroup.ColGroupValue

org.apache.sysds.runtime.compress.colgroup.ColGroupDDC

org.apache.sysds.runtime.compress.colgroup.ColGroupDDC1

All Implemented Interfaces:

Serializable

public class ColGroupDDC1
extends ColGroupDDC

Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC) using 1 byte codes.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sysds.runtime.compress.colgroup.ColGroup

ColGroup.CompressionType

Method Summary

Modifier and Type	Method and Description
long	estimateInMemorySize() Note: Must be overridden by child classes to account for additional data and metadata
byte[]	getData() Getter method to get the data, contained in The DDC ColGroup.
long	getExactSizeOnDisk() Returns the exact serialized size of column group.
void	readFields(DataInput in) Deserialize column group from data input.
void	recodeData(HashMap<Double,Integer> map)
void	rightMultByVector(double[] b, double[] c, int rl, int ru, double[] dictVals) Multiply the slice of the matrix that this column group represents by a vector on the right.
ColGroup	scalarOperation(ScalarOperator op) Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.
String	toString()
void	write(DataOutput out) Serializes column group to data output.

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

countNonZerosPerRow, decompressToBlock, decompressToBlock, decompressToBlock, get, getCompType, getCounts, getCounts, getIterator, getRowIterator, leftMultByMatrix, leftMultByRowVector, leftMultByRowVector, postScaling, postScaling, preAggregate, preAggregate, rightMultByMatrix

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

cleanupThreadLocalMemory, getByteValues, getCounts, getCounts, getIfCountsType, getNumValues, getValues, getValuesAsBlock, isLossy, setupThreadLocalMemory, unaryAggregateOperations, unaryAggregateOperations

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

getColIndex, getColIndices, getNumCols, getNumRows, shiftColIndices

Methods inherited from class java.lang.Object

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

Method Detail

getData

public byte[] getData()

Getter method to get the data, contained in The DDC ColGroup.

Returns:

The contained data

rightMultByVector

public void rightMultByVector(double[] b,
                              double[] c,
                              int rl,
                              int ru,
                              double[] dictVals)

Description copied from class: ColGroup

Multiply the slice of the matrix that this column group represents by a vector on the right.

Specified by:

rightMultByVector in class ColGroup

Parameters:

b - vector to multiply by (tall vector)

c - accumulator for holding the result

rl - row lower

ru - row upper if the internal SystemML code that performs the multiplication experiences an error

dictVals - The dictionary values materialized

recodeData

public void recodeData(HashMap<Double,Integer> map)

write

public void write(DataOutput out)
           throws IOException

Description copied from class: ColGroup

Serializes column group to data output.

Overrides:

write in class ColGroupValue

Parameters:

out - data output

Throws:

IOException - if IOException occurs

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from class: ColGroup

Deserialize column group from data input.

Overrides:

readFields in class ColGroupValue

Parameters:

in - data input

Throws:

IOException - if IOException occurs

getExactSizeOnDisk

public long getExactSizeOnDisk()

Description copied from class: ColGroup

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

Overrides:

getExactSizeOnDisk in class ColGroupValue

Returns:

exact serialized size for column group

estimateInMemorySize

public long estimateInMemorySize()

Description copied from class: ColGroup

Note: Must be overridden by child classes to account for additional data and metadata

Specified by:

estimateInMemorySize in class ColGroup

Returns:

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

scalarOperation

public ColGroup scalarOperation(ScalarOperator op)

Description copied from class: ColGroup

Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.

Specified by:

scalarOperation in class ColGroup

Parameters:

op - operation to perform

Returns:

version of this column group with the operation applied

toString

public String toString()

Overrides:

toString in class ColGroupDDC