weka.filters.unsupervised.attribute

## Class AddNoise

- java.lang.Object
- - weka.filters.Filter
  - - weka.filters.unsupervised.attribute.AddNoise

- All Implemented Interfaces:
    java.io.Serializable, CapabilitiesHandler, CapabilitiesIgnorer, OptionHandler, RevisionHandler, UnsupervisedFilter

      public class AddNoise
      extends Filter
      implements UnsupervisedFilter, OptionHandler

  An instance filter that changes a percentage of a given attributes values. The attribute must be nominal. Missing value can be treated as value itself.

  Valid options are:

       -C <col>
        Index of the attribute to be changed
        (default last attribute)

       -M
        Treat missing values as an extra value

       -P <num>
        Specify the percentage of noise introduced
        to the data (default 10)

       -S <num>
        Specify the random number seed (default 1)

  Version:
    $Revision: 10215 $
  Author:
    Gabi Schmidberger (gabi@cs.waikato.ac.nz)
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `AddNoise()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addNoise(Instances instances, int seed, int percent, int attIndex, boolean useMissing)` add noise to the dataset a given percentage of the instances are changed in the way, that a set of instances are randomly selected using seed.
    `java.lang.String` | `attributeIndexTipText()` Returns the tip text for this property
    `boolean` | `batchFinished()` Signify that this batch of input to the filter is finished.
    `java.lang.String` | `getAttributeIndex()` Get the index of the attribute used.
    `Capabilities` | `getCapabilities()` Returns the Capabilities of this filter.
    `java.lang.String[]` | `getOptions()` Gets the current settings of the filter.
    `int` | `getPercent()` Gets the size of noise data as a percentage of the original set.
    `int` | `getRandomSeed()` Gets the random number seed.
    `java.lang.String` | `getRevision()` Returns the revision string.
    `boolean` | `getUseMissing()` Gets the flag if missing values are treated as extra values.
    `java.lang.String` | `globalInfo()` Returns a string describing this filter
    `boolean` | `input(Instance instance)` Input an instance for filtering.
    `java.util.Enumeration<Option>` | `listOptions()` Returns an enumeration describing the available options
    `static void` | `main(java.lang.String[] argv)` Main method for testing this class.
    `java.lang.String` | `percentTipText()` Returns the tip text for this property
    `java.lang.String` | `randomSeedTipText()` Returns the tip text for this property
    `void` | `setAttributeIndex(java.lang.String attIndex)` Sets index of the attribute used.
    `boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.
    `void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
    `void` | `setPercent(int newPercent)` Sets the size of noise data, as a percentage of the original set.
    `void` | `setRandomSeed(int newSeed)` Sets the random number seed.
    `void` | `setUseMissing(boolean newUseMissing)` Sets the flag if missing values are treated as extra values.
    `java.lang.String` | `useMissingTipText()` Returns the tip text for this property

    - ### Methods inherited from class weka.filters.Filter

      `batchFilterFile, debugTipText, doNotCheckCapabilitiesTipText, filterFile, getCapabilities, getDebug, getDoNotCheckCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, mayRemoveInstanceAfterFirstBatchDone, numPendingOutput, output, outputPeek, runFilter, setDebug, setDoNotCheckCapabilities, toString, useFilter, wekaStaticWrapper`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### AddNoise

          public AddNoise()

  - ### Method Detail

    - #### globalInfo

          public java.lang.String globalInfo()

      Returns a string describing this filter
      Returns:
        a description of the filter suitable for displaying in the explorer/experimenter gui

    - #### listOptions

          public java.util.Enumeration<Option> listOptions()

      Returns an enumeration describing the available options
      Specified by:
        `listOptions` in interface `OptionHandler`
      Overrides:
        `listOptions` in class `Filter`
      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:

           -C <col>
            Index of the attribute to be changed
            (default last attribute)

           -M
            Treat missing values as an extra value

           -P <num>
            Specify the percentage of noise introduced
            to the data (default 10)

           -S <num>
            Specify the random number seed (default 1)

      Specified by:
        `setOptions` in interface `OptionHandler`
      Overrides:
        `setOptions` in class `Filter`
      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 filter.
      Specified by:
        `getOptions` in interface `OptionHandler`
      Overrides:
        `getOptions` in class `Filter`
      Returns:
        an array of strings suitable for passing to setOptions

    - #### useMissingTipText

          public java.lang.String useMissingTipText()

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

    - #### getUseMissing

          public boolean getUseMissing()

      Gets the flag if missing values are treated as extra values.
      Returns:
        the flag missing values.

    - #### setUseMissing

          public void setUseMissing(boolean newUseMissing)

      Sets the flag if missing values are treated as extra values.
      Parameters:
        `newUseMissing` - the new flag value.

    - #### randomSeedTipText

          public java.lang.String randomSeedTipText()

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

    - #### getRandomSeed

          public int getRandomSeed()

      Gets the random number seed.
      Returns:
        the random number seed.

    - #### setRandomSeed

          public void setRandomSeed(int newSeed)

      Sets the random number seed.
      Parameters:
        `newSeed` - the new random number seed.

    - #### percentTipText

          public java.lang.String percentTipText()

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

    - #### getPercent

          public int getPercent()

      Gets the size of noise data as a percentage of the original set.
      Returns:
        the noise data size

    - #### setPercent

          public void setPercent(int newPercent)

      Sets the size of noise data, as a percentage of the original set.
      Parameters:
        `newPercent` - the subsample set size, between 0 and 100.

    - #### attributeIndexTipText

          public java.lang.String attributeIndexTipText()

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

    - #### getAttributeIndex

          public java.lang.String getAttributeIndex()

      Get the index of the attribute used.
      Returns:
        the index of the attribute

    - #### setAttributeIndex

          public void setAttributeIndex(java.lang.String attIndex)

      Sets index of the attribute used.
      Parameters:
        `attIndex` - the index of the attribute

    - #### getCapabilities

          public Capabilities getCapabilities()

      Returns the Capabilities of this filter.
      Specified by:
        `getCapabilities` in interface `CapabilitiesHandler`
      Overrides:
        `getCapabilities` in class `Filter`
      Returns:
        the capabilities of this object
      See Also:
        `Capabilities`

    - #### setInputFormat

          public boolean setInputFormat(Instances instanceInfo)
                                 throws java.lang.Exception

      Sets the format of the input instances.
      Overrides:
        `setInputFormat` in class `Filter`
      Parameters:
        `instanceInfo` - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
      Returns:
        true if the outputFormat may be collected immediately
      Throws:
        `java.lang.Exception` - if the input format can't be set successfully

    - #### input

          public boolean input(Instance instance)
                        throws java.lang.Exception

      Input an instance for filtering.
      Overrides:
        `input` in class `Filter`
      Parameters:
        `instance` - the input instance
      Returns:
        true if the filtered instance may now be collected with output().
      Throws:
        `java.lang.Exception` - if the input format was not set

    - #### batchFinished

          public boolean batchFinished()
                                throws java.lang.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.
      Overrides:
        `batchFinished` in class `Filter`
      Returns:
        true if there are instances pending output
      Throws:
        `java.lang.Exception` - if no input structure has been defined

    - #### addNoise

          public void addNoise(Instances instances,
                      int seed,
                      int percent,
                      int attIndex,
                      boolean useMissing)

      add noise to the dataset a given percentage of the instances are changed in the way, that a set of instances are randomly selected using seed. The attribute given by its index is changed from its current value to one of the other possibly ones, also randomly. This is done with leaving the apportion the same. if m_UseMissing is true, missing value is used as a value of its own
      Parameters:
        `instances` - is the dataset
        `seed` - used for random function
        `percent` - percentage of instances that are changed
        `attIndex` - index of the attribute changed
        `useMissing` - if true missing values are treated as extra value

    - #### getRevision

          public java.lang.String getRevision()

      Returns the revision string.
      Specified by:
        `getRevision` in interface `RevisionHandler`
      Overrides:
        `getRevision` in class `Filter`
      Returns:
        the revision

    - #### main

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

      Main method for testing this class.
      Parameters:
        `argv` - should contain arguments to the filter: use -h for help