Package org.apache.sysds.runtime.transform.encode

Class ColumnEncoderFeatureHash

java.lang.Object

org.apache.sysds.runtime.transform.encode.ColumnEncoder

org.apache.sysds.runtime.transform.encode.ColumnEncoderFeatureHash

All Implemented Interfaces:

Externalizable, Serializable, Comparable<ColumnEncoder>, Encoder

public class ColumnEncoderFeatureHash
extends ColumnEncoder

Class used for feature hashing transformation of frames.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ColumnEncoderFeatureHash.FeatureHashSparseApplyTask

Nested classes/interfaces inherited from class org.apache.sysds.runtime.transform.encode.ColumnEncoder

ColumnEncoder.EncoderType

Field Summary

Fields inherited from class org.apache.sysds.runtime.transform.encode.ColumnEncoder

APPLY_ROW_BLOCKS_PER_COLUMN, BUILD_ROW_BLOCKS_PER_COLUMN

Constructor Summary

Constructors

Constructor	Description
ColumnEncoderFeatureHash()
ColumnEncoderFeatureHash(int colID, long K)

Method Summary

Modifier and Type	Method	Description
void	allocateMetaData(FrameBlock meta)	Pre-allocate a FrameBlock for metadata collection.
void	build(CacheBlock in)	Build the transform meta data for the given block input.
List<DependencyTask<?>>	getBuildTasks(CacheBlock in)
long	getK()
FrameBlock	getMetaData(FrameBlock meta)	Construct a frame block out of the transform meta data.
void	initMetaData(FrameBlock meta)	Sets up the required meta data for a subsequent call to apply.
void	mergeAt(ColumnEncoder other)	Merges another encoder, of a compatible type, in after a certain position.
void	readExternal(ObjectInput in)	Redirects the default java serialization via externalizable to our default hadoop writable serialization for efficient broadcast/rdd deserialization.
void	writeExternal(ObjectOutput out)	Redirects the default java serialization via externalizable to our default hadoop writable serialization for efficient broadcast/rdd serialization.

Methods inherited from class org.apache.sysds.runtime.transform.encode.ColumnEncoder

apply, apply, build, build, buildPartial, compareTo, getApplyTasks, getBuildTask, getColID, getColMapping, getEstMetaSize, getEstNumDistincts, getPartialBuildTask, getPartialMergeBuildTask, getSparseRowsWZeros, isApplicable, isApplicable, prepareBuildPartial, setColID, setEstMetaSize, setEstNumDistincts, shiftCol, updateIndexRanges

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnEncoderFeatureHash

public ColumnEncoderFeatureHash(int colID,
                                long K)

ColumnEncoderFeatureHash

public ColumnEncoderFeatureHash()

Method Detail

getK

public long getK()

build

public void build(CacheBlock in)

Description copied from interface: Encoder

Build the transform meta data for the given block input. This call modifies and keeps meta data as encoder state.

Parameters:

in - input frame block

getBuildTasks

public List<DependencyTask<?>> getBuildTasks(CacheBlock in)

Overrides:

getBuildTasks in class ColumnEncoder

mergeAt

public void mergeAt(ColumnEncoder other)

Description copied from class: ColumnEncoder

Merges another encoder, of a compatible type, in after a certain position. Resizes as necessary. ColumnEncoders are compatible with themselves and EncoderComposite is compatible with every other ColumnEncoders. MultiColumnEncoders are compatible with every encoder

Overrides:

mergeAt in class ColumnEncoder

Parameters:

other - the encoder that should be merged in

allocateMetaData

public void allocateMetaData(FrameBlock meta)

Description copied from interface: Encoder

Pre-allocate a FrameBlock for metadata collection.

Parameters:

meta - frame block

getMetaData

public FrameBlock getMetaData(FrameBlock meta)

Description copied from interface: Encoder

Construct a frame block out of the transform meta data.

Parameters:

meta - output frame block

Returns:

output frame block?

initMetaData

public void initMetaData(FrameBlock meta)

Description copied from interface: Encoder

Sets up the required meta data for a subsequent call to apply.

Parameters:

meta - frame block

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Description copied from class: ColumnEncoder

Redirects the default java serialization via externalizable to our default hadoop writable serialization for efficient broadcast/rdd serialization.

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class ColumnEncoder

Parameters:

out - object output

Throws:

IOException - if IOException occurs

readExternal

public void readExternal(ObjectInput in)
                  throws IOException

Description copied from class: ColumnEncoder

Redirects the default java serialization via externalizable to our default hadoop writable serialization for efficient broadcast/rdd deserialization.

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class ColumnEncoder

Parameters:

in - object input

Throws:

IOException - if IOException occur