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## weka.clusterers
Class CheckClusterer

    java.lang.Object
      weka.core.Check
          weka.core.CheckScheme
              weka.clusterers.CheckClusterer

All Implemented Interfaces:
  OptionHandler, RevisionHandler

    public class CheckClusterer

extends CheckScheme

Class for examining the capabilities and finding problems with clusterers. If you implement a clusterer using the WEKA.libraries, you should run the checks on it to ensure robustness and correct operation. Passing all the tests of this object does not mean bugs in the clusterer don't exist, but this will help find some common ones.

Typical usage:

`java weka.clusterers.CheckClusterer -W clusterer_name -- clusterer_options`

CheckClusterer reports on the following:

- Clusterer abilities
  - Possible command line options to the clusterer
  - Whether the clusterer can predict nominal, numeric, string, date or relational class attributes.
  - Whether the clusterer can handle numeric predictor attributes
  - Whether the clusterer can handle nominal predictor attributes
  - Whether the clusterer can handle string predictor attributes
  - Whether the clusterer can handle date predictor attributes
  - Whether the clusterer can handle relational predictor attributes
  - Whether the clusterer can handle multi-instance data
  - Whether the clusterer can handle missing predictor values
  - Whether the clusterer can handle instance weights
- Correct functioning
  - Correct initialisation during buildClusterer (i.e. no result changes when buildClusterer called repeatedly)
  - Whether the clusterer alters the data pased to it (number of instances, instance order, instance weights, etc)
- Degenerate cases
  - building clusterer with zero training instances
  - all but one predictor attribute values missing
  - all predictor attribute values missing
  - all but one class values missing
  - all class values missing

Running CheckClusterer with the debug option set will output the training dataset for any failed tests.

The `weka.clusterers.AbstractClustererTest` uses this class to test all the clusterers. Any changes here, have to be checked in that abstract test class, too.

Valid options are:

     -D
      Turn on debugging output.

     -S
      Silent mode - prints nothing to stdout.

     -N <num>
      The number of instances in the datasets (default 20).

     -nominal <num>
      The number of nominal attributes (default 2).

     -nominal-values <num>
      The number of values for nominal attributes (default 1).

     -numeric <num>
      The number of numeric attributes (default 1).

     -string <num>
      The number of string attributes (default 1).

     -date <num>
      The number of date attributes (default 1).

     -relational <num>
      The number of relational attributes (default 1).

     -num-instances-relational <num>
      The number of instances in relational/bag attributes (default 10).

     -words <comma-separated-list>
      The words to use in string attributes.

     -word-separators <chars>
      The word separators to use in string attributes.

     -W
      Full name of the clusterer analyzed.
      eg: weka.clusterers.SimpleKMeans
      (default weka.clusterers.SimpleKMeans)

     Options specific to clusterer weka.clusterers.SimpleKMeans:

     -N <num>
      number of clusters.
      (default 2).

     -V
      Display std. deviations for centroids.

     -M
      Replace missing values with mean/mode.

     -S <num>
      Random number seed.
      (default 10)

Options after -- are passed to the designated clusterer.

Version:
  $Revision: 1.11 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz), FracPete (fracpete at waikato dot ac dot nz)
See Also:
  `TestInstances`

Nested Class Summary

Nested classes/interfaces inherited from class weka.core.CheckScheme
`CheckScheme.PostProcessor`

Constructor Summary
`CheckClusterer()` default constructor

Method Summary
`void` | `doTests()` Begin the tests, reporting results to System.out
`Clusterer` | `getClusterer()` Get the clusterer used as the clusterer
`java.lang.String[]` | `getOptions()` Gets the current settings of the CheckClusterer.
`java.lang.String` | `getRevision()` Returns the revision string.
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`static void` | `main(java.lang.String[] args)` Test method for this class
`void` | `setClusterer(Clusterer newClusterer)` Set the clusterer for testing.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.

Methods inherited from class weka.core.CheckScheme
`attributeTypeToString, getNumDate, getNumInstances, getNumInstancesRelational, getNumNominal, getNumNumeric, getNumRelational, getNumString, getPostProcessor, getWords, getWordSeparators, hasClasspathProblems, setNumDate, setNumInstances, setNumInstancesRelational, setNumNominal, setNumNumeric, setNumRelational, setNumString, setPostProcessor, setWords, setWordSeparators`

Methods inherited from class weka.core.Check
`getDebug, getSilent, setDebug, setSilent`

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

Constructor Detail

### CheckClusterer

    public CheckClusterer()

  default constructor

Method Detail

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options.

  Specified by:
    `listOptions` in interface `OptionHandler`
  Overrides:
    `listOptions` in class `CheckScheme`
  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:

       -D
        Turn on debugging output.

       -S
        Silent mode - prints nothing to stdout.

       -N <num>
        The number of instances in the datasets (default 20).

       -nominal <num>
        The number of nominal attributes (default 2).

       -nominal-values <num>
        The number of values for nominal attributes (default 1).

       -numeric <num>
        The number of numeric attributes (default 1).

       -string <num>
        The number of string attributes (default 1).

       -date <num>
        The number of date attributes (default 1).

       -relational <num>
        The number of relational attributes (default 1).

       -num-instances-relational <num>
        The number of instances in relational/bag attributes (default 10).

       -words <comma-separated-list>
        The words to use in string attributes.

       -word-separators <chars>
        The word separators to use in string attributes.

       -W
        Full name of the clusterer analyzed.
        eg: weka.clusterers.SimpleKMeans
        (default weka.clusterers.SimpleKMeans)

       Options specific to clusterer weka.clusterers.SimpleKMeans:

       -N <num>
        number of clusters.
        (default 2).

       -V
        Display std. deviations for centroids.

       -M
        Replace missing values with mean/mode.

       -S <num>
        Random number seed.
        (default 10)

  Specified by:
    `setOptions` in interface `OptionHandler`
  Overrides:
    `setOptions` in class `CheckScheme`
  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 CheckClusterer.

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

### doTests

    public void doTests()

  Begin the tests, reporting results to System.out

  Specified by:
    `doTests` in class `CheckScheme`

### setClusterer

    public void setClusterer(Clusterer newClusterer)

  Set the clusterer for testing.

  Parameters:
    `newClusterer` - the Clusterer to use.

### getClusterer

    public Clusterer getClusterer()

  Get the clusterer used as the clusterer

  Returns:
    the clusterer used as the clusterer

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Returns:
    the revision

### main

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

  Test method for this class

  Parameters:
    `args` - the commandline options

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