Classifier using adaboost on combinations of simple 1D classifiers. More...

#include <clsfy_simple_adaboost.h>

Inheritance diagram for clsfy_simple_adaboost:

Public Member Functions
	clsfy_simple_adaboost ()
	Default constructor.
	clsfy_simple_adaboost (const clsfy_simple_adaboost &)
	Copy constructor.
clsfy_simple_adaboost &	operator= (const clsfy_simple_adaboost &)
	Copy operator.
	~clsfy_simple_adaboost ()
	Destructor.
bool	operator== (const clsfy_simple_adaboost &x) const
	Comparison.
void	clear ()
	Clear all alphas and classifiers.
void	add_classifier (clsfy_classifier_1d *c1d, double alpha, int index)
	Add classifier and alpha value.
void	set_n_clfrs_used (unsigned int x)
	Set number of classifiers used (when applying strong classifier).
int	n_clfrs_used () const
	Access.
virtual void	class_probabilities (vcl_vector< double > &outputs, const vnl_vector< double > &input) const
	Find the posterior probability of the input being in the positive class.
virtual unsigned	classify (const vnl_vector< double > &input) const
	Classify the input vector.
virtual double	log_l (const vnl_vector< double > &input) const
	Log likelihood of being in the positive class.
virtual unsigned	n_dims () const
	The dimensionality of input vectors.
void	set_n_dims (unsigned x)
	Set number of classifiers used (when applying strong classifier).
virtual unsigned	n_classes () const
	The number of possible output classes.
void	set_parameters (const vcl_vector< clsfy_classifier_1d * > &classifier, const vcl_vector< double > &alphas, const vcl_vector< int > &index)
	Set parameters. Clones taken of *classifier[i].
const vcl_vector < clsfy_classifier_1d * > &	classifiers () const
	Access functions.
const vcl_vector< double > &	alphas () const
const vcl_vector< int > &	index () const
short	version_no () const
	Version number for I/O.
virtual vcl_string	is_a () const
	Name of the class.
virtual bool	is_class (vcl_string const &s) const
	Name of the class.
virtual void	print_summary (vcl_ostream &os) const
	Print class to os.
virtual void	b_write (vsl_b_ostream &bfs) const
	Save class to a binary File Stream.
virtual clsfy_classifier_base *	clone () const
	Create a deep copy.
virtual void	b_read (vsl_b_istream &bfs)
	Load the class from a Binary File Stream.
virtual void	classify_many (vcl_vector< unsigned > &outputs, mbl_data_wrapper< vnl_vector< double > > &inputs) const
	Classify many input vectors.
Protected Member Functions
void	delete_stuff ()
	Delete objects on heap.
Protected Attributes
vcl_vector< clsfy_classifier_1d * >	classifier_1d_
	The classifiers in order.
vcl_vector< double >	alphas_
	Coefficients applied to each classifier.
vcl_vector< int >	index_
	Index of input vector appropriate for each classifier.
int	n_clfrs_used_
	number of classifiers used.
int	n_dims_
	dimensionality of data.

Detailed Description

Classifier using adaboost on combinations of simple 1D classifiers.

Uses a weighted combination of 1D classifiers applied to the elements of the input vector.

Definition at line 17 of file clsfy_simple_adaboost.h.

Constructor & Destructor Documentation

clsfy_simple_adaboost::clsfy_simple_adaboost ( )

Default constructor.

Definition at line 22 of file clsfy_simple_adaboost.cxx.

clsfy_simple_adaboost::clsfy_simple_adaboost ( const clsfy_simple_adaboost & c )

Copy constructor.

Definition at line 27 of file clsfy_simple_adaboost.cxx.

clsfy_simple_adaboost::~clsfy_simple_adaboost ( )

Destructor.

Definition at line 62 of file clsfy_simple_adaboost.cxx.

Member Function Documentation

void clsfy_simple_adaboost::add_classifier	(	clsfy_classifier_1d *	c1d,
		double	alpha,
		int	index
	)

Add classifier and alpha value.

Add weak classifier and alpha value.

nb also changes n_clfrs_used to use all current weak classifiers

Definition at line 108 of file clsfy_simple_adaboost.cxx.

const vcl_vector<double>& clsfy_simple_adaboost::alphas ( ) const [inline]

Definition at line 102 of file clsfy_simple_adaboost.h.

void clsfy_simple_adaboost::b_read ( vsl_b_istream & bfs ) [virtual]

Load the class from a Binary File Stream.

Implements clsfy_classifier_base.

Definition at line 222 of file clsfy_simple_adaboost.cxx.

void clsfy_simple_adaboost::b_write ( vsl_b_ostream & bfs ) const [virtual]

Save class to a binary File Stream.

Implements clsfy_classifier_base.

Definition at line 212 of file clsfy_simple_adaboost.cxx.

void clsfy_simple_adaboost::class_probabilities	(	vcl_vector< double > &	outputs,
		const vnl_vector< double > &	input
	)		const `[virtual]`

Find the posterior probability of the input being in the positive class.

The result is outputs(0)

Implements clsfy_classifier_base.

Definition at line 147 of file clsfy_simple_adaboost.cxx.

const vcl_vector<clsfy_classifier_1d*>& clsfy_simple_adaboost::classifiers ( ) const [inline]

Access functions.

Definition at line 99 of file clsfy_simple_adaboost.h.

unsigned clsfy_simple_adaboost::classify ( const vnl_vector< double > & v ) const [virtual]

Classify the input vector.

Returns a number between 0 and nClasses-1 inclusive to represent the most likely class

Returns either 1 (for positive class) or 0 (for negative class)

Reimplemented from clsfy_classifier_base.

Definition at line 121 of file clsfy_simple_adaboost.cxx.

void clsfy_classifier_base::classify_many	(	vcl_vector< unsigned > &	outputs,
		mbl_data_wrapper< vnl_vector< double > > &	inputs
	)		const `[virtual, inherited]`

Classify many input vectors.

Definition at line 55 of file clsfy_classifier_base.cxx.

void clsfy_simple_adaboost::clear ( )

Clear all alphas and classifiers.

Definition at line 100 of file clsfy_simple_adaboost.cxx.

virtual clsfy_classifier_base* clsfy_simple_adaboost::clone ( ) const [inline, virtual]

Create a deep copy.

Client is responsible for deleting returned object.

Implements clsfy_classifier_base.

Definition at line 125 of file clsfy_simple_adaboost.h.

void clsfy_simple_adaboost::delete_stuff ( ) [protected]

Delete objects on heap.

Definition at line 49 of file clsfy_simple_adaboost.cxx.

const vcl_vector<int>& clsfy_simple_adaboost::index ( ) const [inline]

Definition at line 105 of file clsfy_simple_adaboost.h.

vcl_string clsfy_simple_adaboost::is_a ( ) const [virtual]

Name of the class.

Reimplemented from clsfy_classifier_base.

Definition at line 176 of file clsfy_simple_adaboost.cxx.

bool clsfy_simple_adaboost::is_class ( vcl_string const & s ) const [virtual]

Name of the class.

Reimplemented from clsfy_classifier_base.

Definition at line 183 of file clsfy_simple_adaboost.cxx.

double clsfy_simple_adaboost::log_l ( const vnl_vector< double > & v ) const [virtual]

Log likelihood of being in the positive class.

Class probability = 1 / (1+exp(-log_l))

Implements clsfy_classifier_base.

Definition at line 158 of file clsfy_simple_adaboost.cxx.

virtual unsigned clsfy_simple_adaboost::n_classes ( ) const [inline, virtual]

The number of possible output classes.

1 indicates a binary classifier

Implements clsfy_classifier_base.

Definition at line 91 of file clsfy_simple_adaboost.h.

int clsfy_simple_adaboost::n_clfrs_used ( ) const [inline]

Access.

Definition at line 69 of file clsfy_simple_adaboost.h.

virtual unsigned clsfy_simple_adaboost::n_dims ( ) const [inline, virtual]

The dimensionality of input vectors.

Implements clsfy_classifier_base.

Definition at line 84 of file clsfy_simple_adaboost.h.

clsfy_simple_adaboost & clsfy_simple_adaboost::operator= ( const clsfy_simple_adaboost & c )

Copy operator.

Definition at line 34 of file clsfy_simple_adaboost.cxx.

bool clsfy_simple_adaboost::operator== ( const clsfy_simple_adaboost & x ) const

Comparison.

Definition at line 69 of file clsfy_simple_adaboost.cxx.

void clsfy_simple_adaboost::print_summary ( vcl_ostream & os ) const [virtual]

Print class to os.

Implements clsfy_classifier_base.

Definition at line 191 of file clsfy_simple_adaboost.cxx.

void clsfy_simple_adaboost::set_n_clfrs_used ( unsigned int x ) [inline]

Set number of classifiers used (when applying strong classifier).

Definition at line 66 of file clsfy_simple_adaboost.h.

void clsfy_simple_adaboost::set_n_dims ( unsigned x ) [inline]

Set number of classifiers used (when applying strong classifier).

Definition at line 87 of file clsfy_simple_adaboost.h.

void clsfy_simple_adaboost::set_parameters	(	const vcl_vector< clsfy_classifier_1d * > &	classifier,
		const vcl_vector< double > &	alphas,
		const vcl_vector< int > &	index
	)