weka.attributeSelection

Interface AttributeTransformer

All Known Implementing Classes:

PrincipalComponents

public interface AttributeTransformer

Abstract attribute transformer. Transforms the dataset.

Version:

$Revision: 8034 $

Author:

Mark Hall (mhall@cs.waikato.ac.nz)

Method Summary

Methods

Modifier and Type	Method and Description
Instance	convertInstance(Instance instance) Transforms an instance in the format of the original data to the transformed space
Instances	transformedData(Instances data) Transform the supplied data set (assumed to be the same format as the training data)
Instances	transformedHeader() Returns just the header for the transformed data (ie.

Method Detail

transformedHeader

Instances transformedHeader()
                            throws Exception

Returns just the header for the transformed data (ie. an empty set of instances. This is so that AttributeSelection can determine the structure of the transformed data without actually having to get all the transformed data through getTransformedData().

Returns:

the header of the transformed data.

Throws:

Exception - if the header of the transformed data can't be determined.

transformedData

Instances transformedData(Instances data)
                          throws Exception

Transform the supplied data set (assumed to be the same format as the training data)

Returns:

A set of instances representing the transformed data

Throws:

Exception - if the attribute could not be evaluated

convertInstance

Instance convertInstance(Instance instance)
                         throws Exception

Transforms an instance in the format of the original data to the transformed space

Returns:

a transformed instance

Throws:

Exception - if the instance could not be transformed