Class ASEvaluation

java.lang.Object
weka.attributeSelection.ASEvaluation
All Implemented Interfaces:
Serializable, CapabilitiesHandler, RevisionHandler
Direct Known Subclasses:
AttributeSetEvaluator, CfsSubsetEval, ChiSquaredAttributeEval, ConsistencySubsetEval, CostSensitiveASEvaluation, FilteredAttributeEval, FilteredSubsetEval, GainRatioAttributeEval, HoldOutSubsetEvaluator, InfoGainAttributeEval, OneRAttributeEval, ReliefFAttributeEval, SVMAttributeEval, SymmetricalUncertAttributeEval, UnsupervisedAttributeEvaluator, UnsupervisedSubsetEvaluator, WrapperSubsetEval

public abstract class ASEvaluation extends Object implements Serializable, CapabilitiesHandler, RevisionHandler
Abstract attribute selection evaluation class
Version:
$Revision: 11851 $
Author:
Mark Hall (mhall@cs.waikato.ac.nz)
See Also:
  • Constructor Details

    • ASEvaluation

      public ASEvaluation()
  • Method Details

    • buildEvaluator

      public abstract void buildEvaluator(Instances data) throws Exception
      Generates a attribute evaluator. Has to initialize all fields of the evaluator that are not being set via options.
      Parameters:
      data - set of instances serving as training data
      Throws:
      Exception - if the evaluator has not been generated successfully
    • postProcess

      public int[] postProcess(int[] attributeSet) throws Exception
      Provides a chance for a attribute evaluator to do any special post processing of the selected attribute set.
      Parameters:
      attributeSet - the set of attributes found by the search
      Returns:
      a possibly ranked list of postprocessed attributes
      Throws:
      Exception - if postprocessing fails for some reason
    • forName

      public static ASEvaluation forName(String evaluatorName, String[] options) throws Exception
      Creates a new instance of an attribute/subset evaluator given it's class name and (optional) arguments to pass to it's setOptions method. If the evaluator implements OptionHandler and the options parameter is non-null, the evaluator will have it's options set.
      Parameters:
      evaluatorName - the fully qualified class name of the evaluator
      options - an array of options suitable for passing to setOptions. May be null.
      Returns:
      the newly created evaluator, ready for use.
      Throws:
      Exception - if the evaluator name is invalid, or the options supplied are not acceptable to the evaluator
    • makeCopies

      public static ASEvaluation[] makeCopies(ASEvaluation model, int num) throws Exception
      Creates copies of the current evaluator. Note that this method now uses Serialization to perform a deep copy, so the evaluator object must be fully Serializable. Any currently built model will now be copied as well.
      Parameters:
      model - an example evaluator to copy
      num - the number of evaluator copies to create.
      Returns:
      an array of evaluators.
      Throws:
      Exception - if an error occurs
    • getCapabilities

      public Capabilities getCapabilities()
      Returns the capabilities of this evaluator.
      Specified by:
      getCapabilities in interface CapabilitiesHandler
      Returns:
      the capabilities of this evaluator
      See Also:
    • getRevision

      public String getRevision()
      Returns the revision string.
      Specified by:
      getRevision in interface RevisionHandler
      Returns:
      the revision
    • clean

      public void clean()
      Tells the evaluator that the attribute selection process is complete. It can then clean up data structures, references to training data as necessary in order to save memory