org.apache.sysds.runtime.transform.decode

Class Decoder

java.lang.Object

org.apache.sysds.runtime.transform.decode.Decoder

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

DecoderComposite, DecoderDummycode, DecoderPassThrough, DecoderRecode

public abstract class Decoder
extends Object
implements Serializable

Base class for all transform decoders providing both a row and block interface for decoding matrices to frames.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
abstract FrameBlock	decode(MatrixBlock in, FrameBlock out) Block decode API converting a matrix block into a frame block.
String[]	getColnames()
Types.ValueType[]	getSchema()
abstract void	initMetaData(FrameBlock meta)
void	setColnames(String[] colnames)
Decoder	subRangeDecoder(int colStart, int colEnd, int dummycodedOffset) Returns a new Decoder that only handles a sub range of columns.
void	updateIndexRanges(long[] beginDims, long[] endDims) Update index-ranges to after decoding.

Methods inherited from class java.lang.Object

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

Method Detail

getSchema

public Types.ValueType[] getSchema()

setColnames

public void setColnames(String[] colnames)

getColnames

public String[] getColnames()

decode

public abstract FrameBlock decode(MatrixBlock in,
                                  FrameBlock out)

Block decode API converting a matrix block into a frame block.

Parameters:

in - input matrix block

out - output frame block

Returns:

returns given output frame block for convenience

subRangeDecoder

public Decoder subRangeDecoder(int colStart,
                               int colEnd,
                               int dummycodedOffset)

Returns a new Decoder that only handles a sub range of columns. The sub-range refers to the columns after decoding.

Parameters:

colStart - the start index of the sub-range (1-based, inclusive)

colEnd - the end index of the sub-range (1-based, exclusive)

dummycodedOffset - the offset of dummycoded segments before colStart

Returns:

a decoder of the same type, just for the sub-range

updateIndexRanges

public void updateIndexRanges(long[] beginDims,
                              long[] endDims)

Update index-ranges to after decoding. Note that only Dummycoding changes the ranges.

Parameters:

beginDims - the begin indexes before encoding

endDims - the end indexes before encoding

initMetaData

public abstract void initMetaData(FrameBlock meta)