Package weka.knowledgeflow.steps

Class ClassValuePicker

java.lang.Object

weka.knowledgeflow.steps.BaseStep

weka.knowledgeflow.steps.ClassValuePicker

All Implemented Interfaces:

Serializable, BaseStepExtender, Step

@KFStep(name="ClassValuePicker",
        category="Evaluation",
        toolTipText="Designate which class value is considered the \"positive\" class value (useful for ROC analysis)",
        iconPath="weka/gui/knowledgeflow/icons/ClassValuePicker.gif")
public class ClassValuePicker
extends BaseStep

Step that allows the selection of the class label that is to be considered as the "positive" class when computing threshold curves.

Author:

Mark Hall

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ClassValuePicker()

Method Summary

Modifier and Type	Method	Description
String	getClassValue()	Gets the class value considered to be the "positive" class value.
String	getCustomEditorForStep()	Return the fully qualified name of a custom editor component (JComponent) to use for editing the properties of the step.
List<String>	getIncomingConnectionTypes()	Get a list of incoming connection types that this step can accept.
List<String>	getOutgoingConnectionTypes()	Get a list of outgoing connection types that this step can produce.
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	setClassValue(String value)	Set the class value considered to be the "positive" class value.
void	stepInit()	Initialize the step.

Methods inherited from class weka.knowledgeflow.steps.BaseStep

environmentSubstitute, 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

ClassValuePicker

public ClassValuePicker()

Method Details

setClassValue

@OptionMetadata(displayName="Class value",
                description="The class value to consider as the \'positive\' class",
                displayOrder=1)
public void setClassValue(String value)

Set the class value considered to be the "positive" class value.

Parameters:

value - the class value index to use

getClassValue

public String getClassValue()

Gets the class value considered to be the "positive" class value.

Returns:

the class value index

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

getCustomEditorForStep

public String getCustomEditorForStep()

Return the fully qualified name of a custom editor component (JComponent) to use for editing the properties of the step. This method can return null, in which case the system will dynamically generate an editor using the GenericObjectEditor

Specified by:

getCustomEditorForStep in interface Step

Overrides:

getCustomEditorForStep in class BaseStep

Returns:

the fully qualified name of a step editor component