Package weka.knowledgeflow.steps

Class CrossValidationFoldMaker

java.lang.Object

weka.knowledgeflow.steps.BaseStep

weka.knowledgeflow.steps.CrossValidationFoldMaker

All Implemented Interfaces:

Serializable, BaseStepExtender, Step

@KFStep(name="CrossValidationFoldMaker",
        category="Evaluation",
        toolTipText="A Step that creates stratified cross-validation folds from incoming data",
        iconPath="weka/gui/knowledgeflow/icons/CrossValidationFoldMaker.gif")
public class CrossValidationFoldMaker
extends BaseStep

Step for generating cross-validation splits

Version:

$Revision: $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com)

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
CrossValidationFoldMaker()

Method Summary

Modifier and Type	Method	Description
List<String>	getIncomingConnectionTypes()	Get a list of incoming connection types that this step can accept.
String	getNumFolds()	Get the number of folds to create
List<String>	getOutgoingConnectionTypes()	Get a list of outgoing connection types that this step can produce.
boolean	getPreserveOrder()	Get whether to preserve the order of the input instances when creatinbg the folds
String	getSeed()	Get the random seed
Instances	outputStructureForConnectionType(String connectionName)	If possible, get the output structure for the named connection type as a header-only set of instances.
void	processIncoming(Data data)	Process an incoming data payload (if the step accepts incoming connections)
void	setNumFolds(String folds)	Set the number of folds to create
void	setPreserveOrder(boolean preserve)	Set whether to preserve the order of the input instances when creatinbg the folds
void	setSeed(String seed)	Set the random seed to use
void	stepInit()	Initialize the step.

Methods inherited from class weka.knowledgeflow.steps.BaseStep

environmentSubstitute, getCustomEditorForStep, getDefaultSettings, getInteractiveViewers, getInteractiveViewersImpls, getName, getStepManager, globalInfo, isResourceIntensive, isStopRequested, outputStructureForConnectionType, setName, setStepIsResourceIntensive, setStepManager, setStepMustRunSingleThreaded, start, stepMustRunSingleThreaded, stop

Methods inherited from class java.lang.Object

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

Constructor Details

CrossValidationFoldMaker

public CrossValidationFoldMaker()

Method Details

setNumFolds

@OptionMetadata(displayName="Number of folds",
                description="THe number of folds to create",
                displayOrder=0)
public void setNumFolds(String folds)

Set the number of folds to create

Parameters:

folds - the number of folds to create

getNumFolds

public String getNumFolds()

Get the number of folds to create

Returns:

the number of folds to create

setPreserveOrder

@OptionMetadata(displayName="Preserve instances order",
                description="Preserve the order of instances rather than randomly shuffling",
                displayOrder=1)
public void setPreserveOrder(boolean preserve)

Set whether to preserve the order of the input instances when creatinbg the folds

Parameters:

preserve - true to preserve the order

getPreserveOrder

public boolean getPreserveOrder()

Get whether to preserve the order of the input instances when creatinbg the folds

Returns:

true to preserve the order

setSeed

@OptionMetadata(displayName="Random seed",
                description="The random seed to use for shuffling",
                displayOrder=3)
public void setSeed(String seed)

Set the random seed to use

Parameters:

seed - the random seed to use

getSeed

public String getSeed()

Get the random seed

Returns:

the random seed

stepInit

public void stepInit()
              throws WekaException

Initialize the step.

Throws:

WekaException - if a problem occurs during initialization

processIncoming

public void processIncoming(Data data)
                     throws WekaException

Process an incoming data payload (if the step accepts incoming connections)

Specified by:

processIncoming in interface BaseStepExtender

Specified by:

processIncoming in interface Step

Overrides:

processIncoming in class BaseStep

Parameters:

data - the payload to process

Throws:

WekaException - if a problem occurs

getIncomingConnectionTypes

public List<String> getIncomingConnectionTypes()

Get a list of incoming connection types that this step can accept. Ideally (and if appropriate), this should take into account the state of the step and any existing incoming connections. E.g. a step might be able to accept one (and only one) incoming batch data connection.

Returns:

a list of incoming connections that this step can accept given its current state

getOutgoingConnectionTypes

public List<String> getOutgoingConnectionTypes()

Get a list of outgoing connection types that this step can produce. Ideally (and if appropriate), this should take into account the state of the step and the incoming connections. E.g. depending on what incoming connection is present, a step might be able to produce a trainingSet output, a testSet output or neither, but not both.

Returns:

a list of outgoing connections that this step can produce

outputStructureForConnectionType

public Instances outputStructureForConnectionType(String connectionName)
                                           throws WekaException

If possible, get the output structure for the named connection type as a header-only set of instances. Can return null if the specified connection type is not representable as Instances or cannot be determined at present.

Specified by:

outputStructureForConnectionType in interface Step

Overrides:

outputStructureForConnectionType in class BaseStep

Parameters:

connectionName - the name of the connection type to get the output structure for

Returns:

the output structure as a header-only Instances object

Throws:

WekaException - if a problem occurs