ASDC (Apache SystemDS 3.2.0 API)

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
      - org.apache.sysds.runtime.compress.colgroup.AMorphingMMColGroup
        
        org.apache.sysds.runtime.compress.colgroup.ASDC

All Implemented Interfaces:

Serializable, AOffsetsGroup, IContainADictionary, IContainDefaultTuple

Direct Known Subclasses:

ColGroupSDC, ColGroupSDCFOR, ColGroupSDCSingle
```
public abstract class ASDC
extends AMorphingMMColGroup
implements AOffsetsGroup, IContainDefaultTuple
```
Column group that sparsely encodes the dictionary values. The idea is that all values is encoded with indexes except the most common one. the most common one can be inferred by not being included in the indexes. This column group is handy in cases where sparse unsafe operations is executed on very sparse columns. Then the zeros would be materialized in the group without any overhead.

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroup
  AColGroup.CompressionType

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`CompressedSizeInfoColGroup`	`getCompressionInfo(int nRow)`	Get the compression info for this column group.
`ICLAScheme`	`getCompressionScheme()`	Get the compression scheme for this column group to enable compression of other data.
`abstract int`	`getNumberOffsets()`
`int`	`getNumRows()`
`AOffset`	`getOffsets()`

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AMorphingMMColGroup
extractCommon, getCommon, leftMultByAColGroup, leftMultByMatrixNoPreAgg, tsmmAColGroup

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroupValue
centralMoment, clear, computeColSums, estimateInMemorySize, getCounts, getNumberNonZeros, getNumValues, replace, rexpandCols, toString

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.ADictBasedColGroup
copyAndSet, copyAndSet, decompressToDenseBlock, decompressToSparseBlock, getDictionary, getExactSizeOnDisk, rightMultByMatrix, write

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroupCompressed
getMax, getMin, getSum, isEmpty, preAggRows, sameIndexStructure, tsmm, unaryAggregateOperations, unaryAggregateOperations

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroup
addVector, append, appendN, binaryRowOpLeft, binaryRowOpRight, colSum, combine, containsValue, decompressToDenseBlock, decompressToSparseBlock, get, getColIndices, getCompType, getCost, getEncoding, getIdx, getNumCols, morph, recompress, rightMultByMatrix, scalarOperation, shiftColIndices, sliceColumn, sliceColumns, sliceRows, sortColumnIndexes, unaryOperation

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.sysds.runtime.compress.colgroup.IContainDefaultTuple
getDefaultTuple

- Method Detail
  - getNumRows
```
public int getNumRows()
```
  - getOffsets
```
public AOffset getOffsets()
```
    Specified by:
    
    getOffsets in interface AOffsetsGroup
  - getNumberOffsets
```
public abstract int getNumberOffsets()
```
  - getCompressionInfo
```
public final CompressedSizeInfoColGroup getCompressionInfo(int nRow)
```
    Description copied from class: AColGroup
    
    Get the compression info for this column group.
    
    Specified by:
    
    getCompressionInfo in class AColGroup
    
    Parameters:
    
    nRow - The number of rows in this column group.
    
    Returns:
    
    The compression info for this group.
  - getCompressionScheme
```
public ICLAScheme getCompressionScheme()
```
    Description copied from class: AColGroup
    
    Get the compression scheme for this column group to enable compression of other data.
    
    Specified by:
    
    getCompressionScheme in class AColGroup
    
    Returns:
    
    The compression scheme of this column group