类 Resample

java.lang.Object
weka.filters.Filter
weka.filters.unsupervised.instance.Resample
所有已实现的接口:
Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, UnsupervisedFilter

public class Resample extends Filter implements UnsupervisedFilter, OptionHandler
Produces a random subsample of a dataset using either sampling with replacement or without replacement. The original dataset must fit entirely in memory. The number of instances in the generated dataset may be specified. When used in batch mode, subsequent batches are NOT resampled.

Valid options are:

 -S <num>
  Specify the random number seed (default 1)
 -Z <num>
  The size of the output dataset, as a percentage of
  the input dataset (default 100)
 -no-replacement
  Disables replacement of instances
  (default: with replacement)
 -V
  Inverts the selection - only available with '-no-replacement'.
版本:
$Revision: 5548 $
作者:
Len Trigg (len@reeltwo.com), FracPete (fracpete at waikato dot ac dot nz)
另请参阅:
  • 构造器详细资料

    • Resample

      public Resample()
  • 方法详细资料

    • globalInfo

      public String globalInfo()
      Returns a string describing this classifier
      返回:
      a description of the classifier 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 <num>
        Specify the random number seed (default 1)
       -Z <num>
        The size of the output dataset, as a percentage of
        the input dataset (default 100)
       -no-replacement
        Disables replacement of instances
        (default: with replacement)
       -V
        Inverts the selection - only available with '-no-replacement'.
      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 of the filter.
      指定者:
      getOptions 在接口中 OptionHandler
      返回:
      an array of strings suitable for passing to setOptions
    • randomSeedTipText

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

      public int getRandomSeed()
      Gets the random number seed.
      返回:
      the random number seed.
    • setRandomSeed

      public void setRandomSeed(int newSeed)
      Sets the random number seed.
      参数:
      newSeed - the new random number seed.
    • sampleSizePercentTipText

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

      public double getSampleSizePercent()
      Gets the subsample size as a percentage of the original set.
      返回:
      the subsample size
    • setSampleSizePercent

      public void setSampleSizePercent(double newSampleSizePercent)
      Sets the size of the subsample, as a percentage of the original set.
      参数:
      newSampleSizePercent - the subsample set size, between 0 and 100.
    • noReplacementTipText

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

      public boolean getNoReplacement()
      Gets whether instances are drawn with or without replacement.
      返回:
      true if the replacement is disabled
    • setNoReplacement

      public void setNoReplacement(boolean value)
      Sets whether instances are drawn with or with out replacement.
      参数:
      value - if true then the replacement of instances is disabled
    • invertSelectionTipText

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

      public boolean getInvertSelection()
      Gets whether selection is inverted (only if instances are drawn WIHTOUT replacement).
      返回:
      true if the replacement is disabled
      另请参阅:
      • m_NoReplacement
    • setInvertSelection

      public void setInvertSelection(boolean value)
      Sets whether the selection is inverted (only if instances are drawn WIHTOUT replacement).
      参数:
      value - if true then selection is inverted
    • 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:
    • setInputFormat

      public boolean setInputFormat(Instances instanceInfo) throws Exception
      Sets the format of the input instances.
      覆盖:
      setInputFormat 在类中 Filter
      参数:
      instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
      返回:
      true if the outputFormat may be collected immediately
      抛出:
      Exception - if the input format can't be set successfully
    • input

      public boolean input(Instance instance)
      Input an instance for filtering. Filter requires all training 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 structure has been defined
    • batchFinished

      public boolean batchFinished()
      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
    • createSubsampleWithReplacement

      public void createSubsampleWithReplacement(Random random, int origSize, int sampleSize)
      creates the subsample with replacement
      参数:
      random - the random number generator to use
      origSize - the original size of the dataset
      sampleSize - the size to generate
    • createSubsampleWithoutReplacement

      public void createSubsampleWithoutReplacement(Random random, int origSize, int sampleSize)
      creates the subsample without replacement
      参数:
      random - the random number generator to use
      origSize - the original size of the dataset
      sampleSize - the size to generate
    • 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