jsat.datatransform

Class PolynomialTransform

java.lang.Object

jsat.datatransform.PolynomialTransform

All Implemented Interfaces:

Serializable, Cloneable, DataTransform

public class PolynomialTransform
extends Object
implements DataTransform

A transform for applying a polynomial transformation on the data set. As the dimension of the data set grows, the number of new features created by a polynomial transform grows rapidly. It is recommended only for small dimension problems using small degrees.

Author:

Edward Raff

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PolynomialTransform(int degree) Creates a new polynomial transform of the given degree

Method Summary

Modifier and Type	Method and Description
DataTransform	clone()
void	fit(DataSet data) Fits this transform to the given dataset.
int	getDegree() Returns the polynomial degree to use
void	setDegree(int degree) Sets the degree of the polynomial to transform the input vector into
DataPoint	transform(DataPoint dp) Returns a new data point that is a transformation of the original data point.

Methods inherited from class java.lang.Object

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

Constructor Detail

PolynomialTransform

public PolynomialTransform(int degree)

Creates a new polynomial transform of the given degree

Parameters:

degree - the degree of the polynomial

Throws:

ArithmeticException - if the degree is not greater than 1

Method Detail

fit

public void fit(DataSet data)

Description copied from interface: DataTransform

Fits this transform to the given dataset. Some transforms can only be learned from classification or regression datasets. If an incompatible dataset type is given, a FailedToFitException exception may be thrown.

Specified by:

fit in interface DataTransform

Parameters:

data - the dataset to fir this transform to

transform

public DataPoint transform(DataPoint dp)

Description copied from interface: DataTransform

Returns a new data point that is a transformation of the original data point. This new data point is a different object, but may contain the same references as the original data point. It is not guaranteed that you can mutate the transformed point without having a side effect on the original point.

Specified by:

transform in interface DataTransform

Parameters:

dp - the data point to apply a transformation to

Returns:

a transformed data point

clone

public DataTransform clone()

Specified by:

clone in interface DataTransform

Overrides:

clone in class Object

setDegree

public void setDegree(int degree)

Sets the degree of the polynomial to transform the input vector into

Parameters:

degree - the positive degree to use

getDegree

public int getDegree()

Returns the polynomial degree to use

Returns:

the polynomial degree to use