View Class Reference

A view object defines a subset of a labeled data set, and is made up of one or more ‘orderings’, which are sets of indices into the data set. More...

#include <View.h>

Inherits NamedObject.

Inheritance diagram for View:

[legend]Collaboration diagram for View:

[legend]List of all members.

Public Member Functions
	View (const char *name, Data *d)
	Creates an empty View object, associated with the passed Data set.
	View (const char *name, Data *d, int numToGen)
	Creates a View object associated with a particular data set, and generates random orderings of the full data set.
void	addOrdering (OrderedSubset *os)
	Adds a specified ordering to the view.
void	genOrderings (int numToAdd)
	Given a View object with at least a single ordering defined, will generate a specified number of permutations of the first orderings.
int	getNumOrderings ()
	Accessor method.
Data *	getData ()
	Accessor method.
OrderedSubset *	getOrdering (int i)
	Returns the specified ordering.
void	list (ostream &s, int i)
	Generates a space-separated list of the entries in a particular ordering of the View.
void	hist (ostream &s, int i)
	Generates a histogram of the classes in the View.

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Detailed Description

A view object defines a subset of a labeled data set, and is made up of one or more ‘orderings’, which are sets of indices into the data set.

Learning in some classifiers, ARTMAP networks in particular, are sensitive to the order of presentation of samples. By storing multiple orderings of a subset of data within a View object, Classer can train multiple copies of a particular classifier, each with a different ordering of the subset. Orderings may be automatically generated within Classer, or passed from text files if specific orderings are desired. If an ordering is file-based, it is just a set of integer indices into the data set (i.e., line numbers, starting at 1), one per line.

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Constructor & Destructor Documentation

View::View (  const char *  name, Data *  d )

Creates an empty View object, associated with the passed Data set. Parameters: name  The name by which to refer to the object in logged messages. d  The data set object with which to associate the View.

View::View (  const char *  name, Data *  d, int  numToGen )

Creates a View object associated with a particular data set, and generates random orderings of the full data set. Parameters: name  The name by which to refer to the object in logged messages. d  The data set object with which to associate the View. numToGen  The number of orderings to generate. If numToGen = -1, only a single, in-order ordering is generated, otherwise the specified number of orderings are generated, each random.

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Member Function Documentation

void View::addOrdering (  OrderedSubset *  os  )

Adds a specified ordering to the view. Parameters: os  The OrderedSubset object defining the ordering.

void View::genOrderings (  int  numToAdd  )

Given a View object with at least a single ordering defined, will generate a specified number of permutations of the first orderings. This lets the user control which subset of the data is used, but lets Classer handle permuting the set. Parameters: numToAdd  Number of permutations to add to the View. These are permutations of the first ordering. Exceptions: MsgException  If numToAdd <= 0.

Data* View::getData (   )  [inline]

Accessor method. Returns: A pointer to the data set this View refers to.

int View::getNumOrderings (   )  [inline]

Accessor method. Returns: The number of stored orderings

OrderedSubset * View::getOrdering (  int  i  )

Returns the specified ordering. Parameters: i  Index of the specified ordering Exceptions: MsgException  If index is invalid

void View::hist (  ostream &  s, int  orderingIdx )

Generates a histogram of the classes in the View. This is also available for the data set as a whole, but this call can be used if the View is a subset smaller than the whole data set. Also, the call applies to a specified ordering of the View at a time. Parameters: s  The output stream to send the histogram to. orderingIdx  Which of the View's orderings to base the histogram on.

void View::list (  ostream &  s, int  orderingIdx )

Generates a space-separated list of the entries in a particular ordering of the View. Parameters: s  Output stream to receive the list. orderingIdx  The ordering to use.

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The documentation for this class was generated from the following files:

• View.h
• View.cpp

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