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## weka.attributeSelection
Class FilteredSubsetEval

    java.lang.Object
      weka.attributeSelection.ASEvaluation
          weka.attributeSelection.FilteredSubsetEval

All Implemented Interfaces:
  java.io.Serializable, SubsetEvaluator, CapabilitiesHandler, OptionHandler, RevisionHandler

    public class FilteredSubsetEval

extends ASEvaluation
implements java.io.Serializable, SubsetEvaluator, OptionHandler

Class for running an arbitrary subset evaluator on data that has been passed through an arbitrary filter (note: filters that alter the order or number of attributes are not allowed). Like the evaluator, the structure of the filter is based exclusively on the training data.

Valid options are:

     -W <evaluator specification>
      Full name of base evaluator to use, followed by evaluator options.
      eg: "weka.attributeSelection.CfsSubsetEval -L"

     -F <filter specification>
      Full class name of filter to use, followed
      by filter options.
      eg: "weka.filters.supervised.instance.SpreadSubsample -M 1"

Version:
  $Revision: 5562 $
Author:
  Mark Hall (mhall{[at]}pentaho{[dot]}com)
See Also:
  Serialized Form

Constructor Summary
`FilteredSubsetEval()`

Method Summary
`void` | `buildEvaluator(Instances data)` Initializes a filtered attribute evaluator.
`double` | `evaluateSubset(java.util.BitSet subset)` evaluates a subset of attributes
`java.lang.String` | `filterTipText()` Returns the tip text for this property
`Capabilities` | `getCapabilities()` Returns default capabilities of the evaluator.
`Filter` | `getFilter()` Get the filter to use
`java.lang.String[]` | `getOptions()` Gets the current settings of the subset evaluator.
`java.lang.String` | `getRevision()` Returns the revision string.
`ASEvaluation` | `getSubsetEvaluator()` Get the subset evaluator to use
`java.lang.String` | `globalInfo()`
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`static void` | `main(java.lang.String[] args)` Main method for testing this class.
`void` | `setFilter(Filter newFilter)` Set the filter to use
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`void` | `setSubsetEvaluator(ASEvaluation newEvaluator)` Set the subset evaluator to use
`java.lang.String` | `subsetEvaluatorTipText()` Returns the tip text for this property
`java.lang.String` | `toString()` Describe the attribute evaluator

Methods inherited from class weka.attributeSelection.ASEvaluation
`forName, makeCopies, postProcess`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### FilteredSubsetEval

    public FilteredSubsetEval()

Method Detail

### getCapabilities

    public Capabilities getCapabilities()

  Returns default capabilities of the evaluator.

  Specified by:
    `getCapabilities` in interface `CapabilitiesHandler`
  Overrides:
    `getCapabilities` in class `ASEvaluation`
  Returns:
    the capabilities of this evaluator.
  See Also:
    `Capabilities`

### globalInfo

    public java.lang.String globalInfo()

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

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options.

  Specified by:
    `listOptions` in interface `OptionHandler`
  Returns:
    an enumeration of all the available options.

### setOptions

    public void setOptions(java.lang.String[] options)
                    throws java.lang.Exception

  Parses a given list of options.

  Valid options are:

       -W <evaluator specification>
        Full name of base evaluator to use, followed by evaluator options.
        eg: "weka.attributeSelection.CfsSubsetEval -L"

       -F <filter specification>
        Full class name of filter to use, followed
        by filter options.
        eg: "weka.filters.supervised.instance.SpreadSubsample -M 1"

  Specified by:
    `setOptions` in interface `OptionHandler`
  Parameters:
    `options` - the list of options as an array of strings
  Throws:
    `java.lang.Exception` - if an option is not supported

### getOptions

    public java.lang.String[] getOptions()

  Gets the current settings of the subset evaluator.

  Specified by:
    `getOptions` in interface `OptionHandler`
  Returns:
    an array of strings suitable for passing to setOptions

### subsetEvaluatorTipText

    public java.lang.String subsetEvaluatorTipText()

  Returns the tip text for this property

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

### setSubsetEvaluator

    public void setSubsetEvaluator(ASEvaluation newEvaluator)

  Set the subset evaluator to use

  Parameters:
    `newEvaluator` - the subset evaluator to use

### getSubsetEvaluator

    public ASEvaluation getSubsetEvaluator()

  Get the subset evaluator to use

  Returns:
    the subset evaluator to use

### filterTipText

    public java.lang.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 newFilter)

  Set the filter to use

  Parameters:
    `newFilter` - the filter to use

### getFilter

    public Filter getFilter()

  Get the filter to use

  Returns:
    the filter to use

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Overrides:
    `getRevision` in class `ASEvaluation`
  Returns:
    the revision

### buildEvaluator

    public void buildEvaluator(Instances data)
                        throws java.lang.Exception

  Initializes a filtered attribute evaluator.

  Specified by:
    `buildEvaluator` in class `ASEvaluation`
  Parameters:
    `data` - set of instances serving as training data
  Throws:
    `java.lang.Exception` - if the evaluator has not been generated successfully

### evaluateSubset

    public double evaluateSubset(java.util.BitSet subset)
                          throws java.lang.Exception

  evaluates a subset of attributes

  Specified by:
    `evaluateSubset` in interface `SubsetEvaluator`
  Parameters:
    `subset` - a bitset representing the attribute subset to be evaluated
  Returns:
    the "merit" of the subset
  Throws:
    `java.lang.Exception` - if the subset could not be evaluated

### toString

    public java.lang.String toString()

  Describe the attribute evaluator

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    a description of the attribute evaluator as a string

### main

    public static void main(java.lang.String[] args)

  Main method for testing this class.

  Parameters:
    `args` - the options

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