类 AttributeSelection

java.lang.Object
weka.filters.Filter
weka.filters.supervised.attribute.AttributeSelection
所有已实现的接口:
Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, SupervisedFilter

public class AttributeSelection extends Filter implements SupervisedFilter, OptionHandler
A supervised attribute filter that can be used to select attributes. It is very flexible and allows various search and evaluation methods to be combined.

Valid options are:

 -S <"Name of search class [search options]">
  Sets search method for subset evaluators.
  eg. -S "weka.attributeSelection.BestFirst -S 8"
 -E <"Name of attribute/subset evaluation class [evaluator options]">
  Sets attribute/subset evaluator.
  eg. -E "weka.attributeSelection.CfsSubsetEval -L"
 
 Options specific to evaluator weka.attributeSelection.CfsSubsetEval:
 
 -M
  Treat missing values as a seperate value.
 -L
  Don't include locally predictive attributes.
 
 Options specific to search weka.attributeSelection.BestFirst:
 
 -P <start set>
  Specify a starting set of attributes.
  Eg. 1,3,5-7.
 -D <0 = backward | 1 = forward | 2 = bi-directional>
  Direction of search. (default = 1).
 -N <num>
  Number of non-improving nodes to
  consider before terminating search.
 -S <num>
  Size of lookup cache for evaluated subsets.
  Expressed as a multiple of the number of
  attributes in the data set. (default = 1)
版本:
$Revision: 10868 $
作者:
Mark Hall (mhall@cs.waikato.ac.nz)
另请参阅:
  • 构造器详细资料

    • AttributeSelection

      public AttributeSelection()
      Constructor
  • 方法详细资料

    • globalInfo

      public String globalInfo()
      Returns a string describing this filter
      返回:
      a description of the filter suitable for displaying in the explorer/experimenter gui
    • listOptions

      public Enumeration listOptions()
      Returns an enumeration describing the available options.
      指定者:
      listOptions 在接口中 OptionHandler
      返回:
      an enumeration of all the available options.
    • setOptions

      public void setOptions(String[] options) throws Exception
      Parses a given list of options.

      Valid options are:

       -S <"Name of search class [search options]">
        Sets search method for subset evaluators.
        eg. -S "weka.attributeSelection.BestFirst -S 8"
       -E <"Name of attribute/subset evaluation class [evaluator options]">
        Sets attribute/subset evaluator.
        eg. -E "weka.attributeSelection.CfsSubsetEval -L"
       
       Options specific to evaluator weka.attributeSelection.CfsSubsetEval:
       
       -M
        Treat missing values as a seperate value.
       -L
        Don't include locally predictive attributes.
       
       Options specific to search weka.attributeSelection.BestFirst:
       
       -P <start set>
        Specify a starting set of attributes.
        Eg. 1,3,5-7.
       -D <0 = backward | 1 = forward | 2 = bi-directional>
        Direction of search. (default = 1).
       -N <num>
        Number of non-improving nodes to
        consider before terminating search.
       -S <num>
        Size of lookup cache for evaluated subsets.
        Expressed as a multiple of the number of
        attributes in the data set. (default = 1)
      指定者:
      setOptions 在接口中 OptionHandler
      参数:
      options - the list of options as an array of strings
      抛出:
      Exception - if an option is not supported
    • getOptions

      public String[] getOptions()
      Gets the current settings for the attribute selection (search, evaluator) etc.
      指定者:
      getOptions 在接口中 OptionHandler
      返回:
      an array of strings suitable for passing to setOptions()
    • evaluatorTipText

      public String evaluatorTipText()
      Returns the tip text for this property
      返回:
      tip text for this property suitable for displaying in the explorer/experimenter gui
    • setEvaluator

      public void setEvaluator(ASEvaluation evaluator)
      set attribute/subset evaluator
      参数:
      evaluator - the evaluator to use
    • searchTipText

      public String searchTipText()
      Returns the tip text for this property
      返回:
      tip text for this property suitable for displaying in the explorer/experimenter gui
    • setSearch

      public void setSearch(ASSearch search)
      Set search class
      参数:
      search - the search class to use
    • getEvaluator

      public ASEvaluation getEvaluator()
      Get the name of the attribute/subset evaluator
      返回:
      the name of the attribute/subset evaluator as a string
    • getSearch

      public ASSearch getSearch()
      Get the name of the search method
      返回:
      the name of the search method as a string
    • getCapabilities

      public Capabilities getCapabilities()
      Returns the Capabilities of this filter.
      指定者:
      getCapabilities 在接口中 CapabilitiesHandler
      覆盖:
      getCapabilities 在类中 Filter
      返回:
      the capabilities of this object
      另请参阅:
    • input

      public boolean input(Instance instance) throws Exception
      Input an instance for filtering. Ordinarily the instance is processed and made available for output immediately. Some filters require all instances be read before producing output.
      覆盖:
      input 在类中 Filter
      参数:
      instance - the input instance
      返回:
      true if the filtered instance may now be collected with output().
      抛出:
      IllegalStateException - if no input format has been defined.
      Exception - if the input instance was not of the correct format or if there was a problem with the filtering.
    • batchFinished

      public boolean batchFinished() throws Exception
      Signify that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances.
      覆盖:
      batchFinished 在类中 Filter
      返回:
      true if there are instances pending output.
      抛出:
      IllegalStateException - if no input structure has been defined.
      Exception - if there is a problem during the attribute selection.
    • getRevision

      public String getRevision()
      Returns the revision string.
      指定者:
      getRevision 在接口中 RevisionHandler
      覆盖:
      getRevision 在类中 Filter
      返回:
      the revision
    • main

      public static void main(String[] argv)
      Main method for testing this class.
      参数:
      argv - should contain arguments to the filter: use -h for help