org.datavec.api.transform.transform.doubletransform

Class Log2Normalizer

java.lang.Object

org.datavec.api.transform.transform.BaseTransform

org.datavec.api.transform.transform.BaseColumnTransform

org.datavec.api.transform.transform.doubletransform.BaseDoubleTransform

org.datavec.api.transform.transform.doubletransform.Log2Normalizer

All Implemented Interfaces:

Serializable, ColumnOp, Operation<Schema,Schema>, Transform

public class Log2Normalizer
extends BaseDoubleTransform

Normalize by taking scale * log2((in-columnMin)/(mean-columnMin) + 1) Maps values in range (columnMin to infinity) to (0 to infinity) Most suitable for values with a geometric/negative exponential type distribution.

Author:

Alex Black

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected double	columnMean
protected double	columnMin
protected static double	log2
protected double	scalingFactor

Fields inherited from class org.datavec.api.transform.transform.BaseColumnTransform

columnName, columnNumber

Fields inherited from class org.datavec.api.transform.transform.BaseTransform

inputSchema

Constructor Summary

Constructors

Constructor and Description
Log2Normalizer(String columnName, double columnMean, double columnMin, double scalingFactor)

Method Summary

Modifier and Type	Method and Description
ColumnMetaData	getNewColumnMetaData(String newColumnName, ColumnMetaData oldColumnMeta)
Object	map(Object input) Transform an object in to another object
Writable	map(Writable writable)
String	toString()

Methods inherited from class org.datavec.api.transform.transform.BaseColumnTransform

columnName, columnNames, equals, hashCode, map, mapSequence, outputColumnName, outputColumnNames, setInputSchema, transform

Methods inherited from class org.datavec.api.transform.transform.BaseTransform

getInputSchema, mapSequence

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.datavec.api.transform.ColumnOp

getInputSchema

Field Detail

log2

protected static final double log2

columnMean

protected final double columnMean

columnMin

protected final double columnMin

scalingFactor

protected final double scalingFactor

Constructor Detail

Log2Normalizer

public Log2Normalizer(String columnName,
                      double columnMean,
                      double columnMin,
                      double scalingFactor)

Method Detail

map

public Writable map(Writable writable)

Specified by:

map in class BaseDoubleTransform

getNewColumnMetaData

public ColumnMetaData getNewColumnMetaData(String newColumnName,
                                           ColumnMetaData oldColumnMeta)

Overrides:

getNewColumnMetaData in class BaseDoubleTransform

toString

public String toString()

Specified by:

toString in class BaseColumnTransform

map

public Object map(Object input)

Transform an object in to another object

Parameters:

input - the record to transform

Returns:

the transformed writable