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## weka.estimators
Class CheckEstimator

    java.lang.Object
      weka.estimators.CheckEstimator

All Implemented Interfaces:
  OptionHandler, RevisionHandler

    public class CheckEstimator

extends java.lang.Object
implements OptionHandler, RevisionHandler

Class for examining the capabilities and finding problems with estimators. If you implement a estimator 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 estimator don't exist, but this will help find some common ones.

Typical usage:

`java weka.estimators.CheckEstimator -W estimator_name estimator_options`

This class uses code from the CheckEstimatorClass ATTENTION! Current estimators can only 1. split on a nominal class attribute 2. build estimators for nominal and numeric attributes 3. build estimators independendly of the class type The functionality to test on other class and attribute types is left in big parts in the code. CheckEstimator reports on the following:

- Estimator abilities
  - Possible command line options to the estimator
  - Whether the estimator can predict nominal, numeric, string, date or relational class attributes. Warnings will be displayed if performance is worse than ZeroR
  - Whether the estimator can be trained incrementally
  - Whether the estimator can build estimates for numeric attributes
  - Whether the estimator can handle nominal attributes
  - Whether the estimator can handle string attributes
  - Whether the estimator can handle date attributes
  - Whether the estimator can handle relational attributes
  - Whether the estimator build estimates for multi-instance data
  - Whether the estimator can handle missing attribute values
  - Whether the estimator can handle missing class values
  - Whether a nominal estimator only handles 2 class problems
  - Whether the estimator can handle instance weights
- Correct functioning
  - Correct initialisation during addvalues (i.e. no result changes when addValues called repeatedly)
  - Whether incremental training produces the same results as during non-incremental training (which may or may not be OK)
  - Whether the estimator alters the data pased to it (number of instances, instance order, instance weights, etc)
- Degenerate cases
  - building estimator with zero training instances
  - all but one attribute attribute values missing
  - all attribute attribute values missing
  - all but one class values missing
  - all class values missing

Running CheckEstimator with the debug option set will output the training and test datasets for any failed tests.

The `weka.estimators.AbstractEstimatorTest` uses this class to test all the estimators. 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 100).

     -W
      Full name of the estimator analysed.
      eg: weka.estimators.NormalEstimator

     Options specific to estimator weka.estimators.NormalEstimator:

     -D
      If set, estimator is run in debug mode and
      may output additional info to the console

Options after -- are passed to the designated estimator.

Version:
  $Revision: 1.5 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz), FracPete (fracpete at waikato dot ac dot nz)
See Also:
  `TestInstances`

Nested Class Summary
`static class` | `CheckEstimator.AttrTypes` class that contains info about the attribute types the estimator can estimate estimator work on one attribute only
`static class` | `CheckEstimator.EstTypes` public class that contains info about the chosen attribute type estimator work on one attribute only
`class` | `CheckEstimator.PostProcessor` a class for postprocessing the test-data

Constructor Summary
`CheckEstimator()`

Method Summary
`void` | `doTests()` Begin the tests, reporting results to System.out
`boolean` | `getDebug()` Get whether debugging is turned on
`Estimator` | `getEstimator()` Get the estimator used as the estimator
`static int` | `getMinMax(Instances inst, int attrIndex, double[] minMax)` Find the minimum and the maximum of the attribute and return it in the last parameter..
`int` | `getNumInstances()` Gets the current number of instances to use for the datasets.
`java.lang.String[]` | `getOptions()` Gets the current settings of the CheckEstimator.
`CheckEstimator.PostProcessor` | `getPostProcessor()` returns the current PostProcessor, can be null
`java.lang.String` | `getRevision()` Returns the revision string.
`boolean` | `getSilent()` Get whether silent mode is turned on
`boolean` | `hasClasspathProblems()` returns TRUE if the estimator returned a "not in classpath" Exception
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`static void` | `main(java.lang.String[] args)` Test method for this class
`void` | `setDebug(boolean debug)` Set debugging mode
`void` | `setEstimator(Estimator newEstimator)` Set the estimator for boosting.
`void` | `setNumInstances(int value)` Sets the number of instances to use in the datasets (some estimators might require more instances).
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`void` | `setPostProcessor(CheckEstimator.PostProcessor value)` sets the PostProcessor to use
`void` | `setSilent(boolean value)` Set slient mode, i.e., no output at all to stdout

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

Constructor Detail

### CheckEstimator

    public CheckEstimator()

Method Detail

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options.

  Specified by:
    `listOptions` in interface `OptionHandler`
  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 100).

       -W
        Full name of the estimator analysed.
        eg: weka.estimators.NormalEstimator

       Options specific to estimator weka.estimators.NormalEstimator:

       -D
        If set, estimator is run in debug mode and
        may output additional info to the console

  Specified by:
    `setOptions` in interface `OptionHandler`
  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 CheckEstimator.

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

### setPostProcessor

    public void setPostProcessor(CheckEstimator.PostProcessor value)

  sets the PostProcessor to use

  Parameters:
    `value` - the new PostProcessor
  See Also:
    `m_PostProcessor`

### getPostProcessor

    public CheckEstimator.PostProcessor getPostProcessor()

  returns the current PostProcessor, can be null

  Returns:
    the current PostProcessor

### hasClasspathProblems

    public boolean hasClasspathProblems()

  returns TRUE if the estimator returned a "not in classpath" Exception

  Returns:
    true if CLASSPATH problems occurred

### doTests

    public void doTests()

  Begin the tests, reporting results to System.out

### setDebug

    public void setDebug(boolean debug)

  Set debugging mode

  Parameters:
    `debug` - true if debug output should be printed

### getDebug

    public boolean getDebug()

  Get whether debugging is turned on

  Returns:
    true if debugging output is on

### setSilent

    public void setSilent(boolean value)

  Set slient mode, i.e., no output at all to stdout

  Parameters:
    `value` - whether silent mode is active or not

### getSilent

    public boolean getSilent()

  Get whether silent mode is turned on

  Returns:
    true if silent mode is on

### setNumInstances

    public void setNumInstances(int value)

  Sets the number of instances to use in the datasets (some estimators might require more instances).

  Parameters:
    `value` - the number of instances to use

### getNumInstances

    public int getNumInstances()

  Gets the current number of instances to use for the datasets.

  Returns:
    the number of instances

### setEstimator

    public void setEstimator(Estimator newEstimator)

  Set the estimator for boosting.

  Parameters:
    `newEstimator` - the Estimator to use.

### getEstimator

    public Estimator getEstimator()

  Get the estimator used as the estimator

  Returns:
    the estimator used as the estimator

### getMinMax

    public static int getMinMax(Instances inst,
                                int attrIndex,
                                double[] minMax)
                         throws java.lang.Exception

  Find the minimum and the maximum of the attribute and return it in the last parameter..

  Parameters:
    `inst` - instances used to build the estimator
    `attrIndex` - index of the attribute
    `minMax` - the array to return minimum and maximum in
  Returns:
    number of not missing values
  Throws:
    `java.lang.Exception` - if parameter minMax wasn't initialized properly

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Returns:
    the revision

### main

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

  Test method for this class

  Parameters:
    `args` - the commandline parameters

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