Package weka.core.neighboursearch

Class FilteredNeighbourSearch

java.lang.Object

weka.core.neighboursearch.NearestNeighbourSearch

weka.core.neighboursearch.FilteredNeighbourSearch

All Implemented Interfaces:

Serializable, AdditionalMeasureProducer, CapabilitiesHandler, OptionHandler, RevisionHandler

public class FilteredNeighbourSearch
extends NearestNeighbourSearch
implements CapabilitiesHandler

Applies the given filter before calling the given neighbour search method. The filter must not change the size of the dataset or the order of the instances! Also, the range setting that is specified for the distance function is ignored: all attributes are used for the distance calculation.

Valid options are:

 -F
  The filter to use. (default: weka.filters.AllFilter)

 -S
  The search method to use. (default: weka.core.neighboursearch.LinearNNSearch)

 
 Options specific to filter weka.filters.AllFilter:
 

 -output-debug-info
  If set, filter is run in debug mode and
  may output additional info to the console

 -do-not-check-capabilities
  If set, filter capabilities are not checked before filter is built
  (use with caution).

 
 Options specific to search method weka.core.neighboursearch.LinearNNSearch:
 

 -S
  Skip identical instances (distances equal to zero).
 

 -A <classname and options>
  Distance function to use.
  (default: weka.core.EuclideanDistance)

 -P
  Calculate performance statistics.

Version:

$Revision: 8034 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
FilteredNeighbourSearch()

Method Summary

Modifier and Type	Method	Description
void	addInstanceInfo(Instance ins)	Updates the instance info in the underlying search method, once the instance has been filtered.
String	filterTipText()	Returns the tip text for this property
Capabilities	getCapabilities()	Returns default capabilities of the classifier.
double[]	getDistances()	Returns the distances for the nearest neighbours in the FILTERED space
Filter	getFilter()	Gets the filter used.
String[]	getOptions()	Gets the current settings.
String	getRevision()	Returns the revision string
NearestNeighbourSearch	getSearchMethod()	Gets the search method used.
String	globalInfo()	Returns a string describing this object.
Instances	kNearestNeighbours(Instance target, int k)	Returns the nearest neighbours for the given instance based on distance measured in the filtered space.
Enumeration<Option>	listOptions()	Returns an enumeration describing the available options.
Instance	nearestNeighbour(Instance target)	Returns the nearest neighbour for the given instance based on distance measured in the filtered space.
String	searchMethodTipText()	Returns the tip text for this property
void	setFilter(Filter filter)	Sets the filter
void	setInstances(Instances data)	Sets the instances to build the filtering model from.
void	setOptions(String[] options)	Parses a given list of options.
void	setSearchMethod(NearestNeighbourSearch search)	Sets the search method
void	update(Instance ins)	Updates ranges based on the given instance, once it has been filtered.

Methods inherited from class weka.core.neighboursearch.NearestNeighbourSearch

combSort11, distanceFunctionTipText, enumerateMeasures, getDistanceFunction, getInstances, getMeasure, getMeasurePerformance, getPerformanceStats, measurePerformanceTipText, quickSort, setDistanceFunction, setMeasurePerformance

Methods inherited from class java.lang.Object

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

Constructor Details

FilteredNeighbourSearch

public FilteredNeighbourSearch()

Method Details

getCapabilities

public Capabilities getCapabilities()

Returns default capabilities of the classifier.

Specified by:

getCapabilities in interface CapabilitiesHandler

Returns:

the capabilities of this classifier

See Also:

• Capabilities

setInstances

public void setInstances(Instances data)

Sets the instances to build the filtering model from.

Overrides:

setInstances in class NearestNeighbourSearch

Parameters:

insts - the Instances object

globalInfo

public String globalInfo()

Returns a string describing this object.

Overrides:

globalInfo in class NearestNeighbourSearch

Returns:

a description of the evaluator suitable for displaying in the explorer/experimenter gui

filterTipText

public String filterTipText()

Returns the tip text for this property

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

setFilter

public void setFilter(Filter filter)

Sets the filter

Parameters:

filter - the filter with all options set.

getFilter

public Filter getFilter()

Gets the filter used.

Returns:

the filter

searchMethodTipText

public String searchMethodTipText()

Returns the tip text for this property

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

setSearchMethod

public void setSearchMethod(NearestNeighbourSearch search)

Sets the search method

Parameters:

searchMethod - the search method with all options set.

getSearchMethod

public NearestNeighbourSearch getSearchMethod()

Gets the search method used.

Returns:

the search method

listOptions

public Enumeration<Option> listOptions()

Returns an enumeration describing the available options.

Specified by:

listOptions in interface OptionHandler

Overrides:

listOptions in class NearestNeighbourSearch

Returns:

an enumeration of all the available options.

getOptions

public String[] getOptions()

Gets the current settings. Returns empty array.

Specified by:

getOptions in interface OptionHandler

Overrides:

getOptions in class NearestNeighbourSearch

Returns:

an array of strings suitable for passing to setOptions()

setOptions

public void setOptions(String[] options)
                throws Exception

Parses a given list of options.

Specified by:

setOptions in interface OptionHandler

Overrides:

setOptions in class NearestNeighbourSearch

Parameters:

options - the list of options as an array of strings

Throws:

Exception - if an option is not supported

getRevision

public String getRevision()

Returns the revision string

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision

See Also:

• RevisionHandler.getRevision()

nearestNeighbour

public Instance nearestNeighbour(Instance target)
                          throws Exception

Returns the nearest neighbour for the given instance based on distance measured in the filtered space.

Specified by:

nearestNeighbour in class NearestNeighbourSearch

Parameters:

target - the instance for which to find the nearest neighbour

Returns:

the nearest neighbour

Throws:

Exception - if the nearest neighbour could not be found.

See Also:

• NearestNeighbourSearch.nearestNeighbour(weka.core.Instance)

kNearestNeighbours

public Instances kNearestNeighbours(Instance target,
 int k)
                             throws Exception

Returns the nearest neighbours for the given instance based on distance measured in the filtered space.

Specified by:

kNearestNeighbours in class NearestNeighbourSearch

Parameters:

target - the instance for which to find the nearest neighbour

k - the number of nearest neighbours to return

Returns:

the nearest Neighbours

Throws:

Exception - if the neighbours could not be found.

See Also:

• NearestNeighbourSearch.kNearestNeighbours(weka.core.Instance, int)

getDistances

public double[] getDistances()
                      throws Exception

Returns the distances for the nearest neighbours in the FILTERED space

Specified by:

getDistances in class NearestNeighbourSearch

Returns:

the array of distances for the nearest neighbours

Throws:

Exception - if called before calling kNearestNeighbours or nearestNeighbours.

See Also:

• NearestNeighbourSearch.getDistances()

update

public void update(Instance ins)
            throws Exception

Updates ranges based on the given instance, once it has been filtered.

Specified by:

update in class NearestNeighbourSearch

Parameters:

ins - the instance to add

Throws:

Exception - if updating fails

See Also:

• NearestNeighbourSearch.update(weka.core.Instance)

addInstanceInfo

public void addInstanceInfo(Instance ins)

Updates the instance info in the underlying search method, once the instance has been filtered.

Overrides:

addInstanceInfo in class NearestNeighbourSearch

Parameters:

ins - The instance to add the information of.