pdf1d_mixture_builder Class Reference

#include <pdf1d_mixture_builder.h>

Inheritance diagram for pdf1d_mixture_builder:

Inheritance graph
[legend]

List of all members.


Detailed Description

Uses the EM algorithm to build pdf1d_mixture objects.

Definition at line 19 of file pdf1d_mixture_builder.h.


Public Member Functions

 pdf1d_mixture_builder ()
 Dflt ctor.
 pdf1d_mixture_builder (const pdf1d_mixture_builder &)
 Copy ctor.
pdf1d_mixture_builderoperator= (const pdf1d_mixture_builder &)
 Copy operator.
virtual ~pdf1d_mixture_builder ()
 Destructor.
void init (pdf1d_builder &builder, int n)
 Initialise n builders of type builder.
void set_max_iterations (int n)
 Define maximum number of EM iterations allowed.
bool weights_fixed () const
 Whether weights on components left unchanged during iterations.
void set_weights_fixed (bool b)
 Whether weights on components left unchanged during iterations.
virtual pdf1d_pdfnew_model () const
 Create empty model.
virtual vcl_string new_model_type () const
 Name of the model class returned by new_model().
virtual void set_min_var (double min_var)
 Define lower threshold on variance for built models.
virtual double min_var () const
 Get lower threshold on variance for built models.
virtual void build (pdf1d_pdf &model, double mean) const
 Build default model with given mean.
virtual void build (pdf1d_pdf &model, mbl_data_wrapper< double > &data) const
 Build model from data.
virtual void weighted_build (pdf1d_pdf &model, mbl_data_wrapper< double > &data, const vcl_vector< double > &wts) const
 Build model from weighted data.
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
 Does the name of the class match the argument?.
virtual pdf1d_builderclone () const
 Create a copy on the heap and return base class pointer.
virtual void print_summary (vcl_ostream &os) const
 Print class to os.
virtual void b_write (vsl_b_ostream &bfs) const
 Save class to binary file stream.
virtual void b_read (vsl_b_istream &bfs)
 Load class from binary file stream.
virtual void build_from_array (pdf1d_pdf &model, const double *data, int n) const
 Build model from data.

Static Public Member Functions

static void calc_mean_and_variance (pdf1d_mixture &model)
 Calculate and set the mixture's mean and variance.

Private Member Functions

void initialise (pdf1d_mixture &model, const double *data, const vcl_vector< double > &wts) const
void e_step (pdf1d_mixture &model, vcl_vector< vnl_vector< double > > &probs, const double *data, const vcl_vector< double > &wts) const
 The Expectation part of the EM algorithm.
double m_step (pdf1d_mixture &model, const vcl_vector< vnl_vector< double > > &probs, const double *data, const vcl_vector< double > &wts) const
 The Maximisation part of the EM algorithm.
void init ()
void delete_stuff ()

Private Attributes

vcl_vector< pdf1d_builder * > builder_
double min_var_
int max_its_
bool weights_fixed_
 Whether weights changed during iterations.

Constructor & Destructor Documentation

pdf1d_mixture_builder::pdf1d_mixture_builder (  ) 

Dflt ctor.

Definition at line 33 of file pdf1d_mixture_builder.cxx.

pdf1d_mixture_builder::pdf1d_mixture_builder ( const pdf1d_mixture_builder b  ) 

Copy ctor.

Definition at line 39 of file pdf1d_mixture_builder.cxx.

pdf1d_mixture_builder::~pdf1d_mixture_builder (  )  [virtual]

Destructor.

Definition at line 75 of file pdf1d_mixture_builder.cxx.


Member Function Documentation

void pdf1d_mixture_builder::initialise ( pdf1d_mixture model,
const double *  data,
const vcl_vector< double > &  wts 
) const [private]

Definition at line 226 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::e_step ( pdf1d_mixture model,
vcl_vector< vnl_vector< double > > &  probs,
const double *  data,
const vcl_vector< double > &  wts 
) const [private]

The Expectation part of the EM algorithm.

Definition at line 274 of file pdf1d_mixture_builder.cxx.

double pdf1d_mixture_builder::m_step ( pdf1d_mixture model,
const vcl_vector< vnl_vector< double > > &  probs,
const double *  data,
const vcl_vector< double > &  wts 
) const [private]

The Maximisation part of the EM algorithm.

Definition at line 332 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::init (  )  [private]

Definition at line 23 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::delete_stuff (  )  [private]

Definition at line 67 of file pdf1d_mixture_builder.cxx.

pdf1d_mixture_builder & pdf1d_mixture_builder::operator= ( const pdf1d_mixture_builder b  ) 

Copy operator.

Definition at line 47 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::init ( pdf1d_builder builder,
int  n 
)

Initialise n builders of type builder.

Clone taken of builder

Definition at line 84 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::set_max_iterations ( int  n  ) 

Define maximum number of EM iterations allowed.

Definition at line 95 of file pdf1d_mixture_builder.cxx.

bool pdf1d_mixture_builder::weights_fixed (  )  const [inline]

Whether weights on components left unchanged during iterations.

Definition at line 69 of file pdf1d_mixture_builder.h.

void pdf1d_mixture_builder::set_weights_fixed ( bool  b  ) 

Whether weights on components left unchanged during iterations.

Define whether weights on components can change or not.

Definition at line 101 of file pdf1d_mixture_builder.cxx.

pdf1d_pdf * pdf1d_mixture_builder::new_model (  )  const [virtual]

Create empty model.

Implements pdf1d_builder.

Definition at line 109 of file pdf1d_mixture_builder.cxx.

vcl_string pdf1d_mixture_builder::new_model_type (  )  const [virtual]

Name of the model class returned by new_model().

Implements pdf1d_builder.

Definition at line 114 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::set_min_var ( double  min_var  )  [virtual]

Define lower threshold on variance for built models.

Implements pdf1d_builder.

Definition at line 122 of file pdf1d_mixture_builder.cxx.

double pdf1d_mixture_builder::min_var (  )  const [virtual]

Get lower threshold on variance for built models.

Implements pdf1d_builder.

Definition at line 130 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::calc_mean_and_variance ( pdf1d_mixture model  )  [static]

Calculate and set the mixture's mean and variance.

This should be used after the weights or components of the model have been altered.

Definition at line 389 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::build ( pdf1d_pdf model,
double  mean 
) const [virtual]

Build default model with given mean.

Implements pdf1d_builder.

Definition at line 138 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::build ( pdf1d_pdf model,
mbl_data_wrapper< double > &  data 
) const [virtual]

Build model from data.

Use EM algorithm to best fit mixture model to given data If model does not have the correct number of components they will be initialised to means scattered through the data. If they model has the correct number of components it is assumed that they have been set to sensible initial values. The EM algorithm will be used to optimise their parameters.

Implements pdf1d_builder.

Definition at line 147 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::weighted_build ( pdf1d_pdf model,
mbl_data_wrapper< double > &  data,
const vcl_vector< double > &  wts 
) const [virtual]

Build model from weighted data.

Use EM algorithm to best fit mixture model to given data If model does not have the correct number of components they will be initialised to means scattered through the data. If they model has the correct number of components it is assumed that they have been set to sensible initial values. The EM algorithm will be used to optimise their parameters.

Implements pdf1d_builder.

Definition at line 158 of file pdf1d_mixture_builder.cxx.

short pdf1d_mixture_builder::version_no (  )  const

Version number for I/O.

Reimplemented from pdf1d_builder.

Definition at line 425 of file pdf1d_mixture_builder.cxx.

vcl_string pdf1d_mixture_builder::is_a (  )  const [virtual]

Name of the class.

Reimplemented from pdf1d_builder.

Definition at line 411 of file pdf1d_mixture_builder.cxx.

bool pdf1d_mixture_builder::is_class ( vcl_string const &  s  )  const [virtual]

Does the name of the class match the argument?.

Reimplemented from pdf1d_builder.

Definition at line 418 of file pdf1d_mixture_builder.cxx.

pdf1d_builder * pdf1d_mixture_builder::clone (  )  const [virtual]

Create a copy on the heap and return base class pointer.

Implements pdf1d_builder.

Definition at line 432 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::print_summary ( vcl_ostream &  os  )  const [virtual]

Print class to os.

Implements pdf1d_builder.

Definition at line 439 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::b_write ( vsl_b_ostream bfs  )  const [virtual]

Save class to binary file stream.

Implements pdf1d_builder.

Definition at line 451 of file pdf1d_mixture_builder.cxx.

void pdf1d_mixture_builder::b_read ( vsl_b_istream bfs  )  [virtual]

Load class from binary file stream.

Implements pdf1d_builder.

Definition at line 462 of file pdf1d_mixture_builder.cxx.

void pdf1d_builder::build_from_array ( pdf1d_pdf model,
const double *  data,
int  n 
) const [virtual, inherited]

Build model from data.

Default wraps up data and calls build(model,wrapper);

Reimplemented in pdf1d_exponential_builder, pdf1d_flat_builder, pdf1d_gaussian_builder, and pdf1d_kernel_pdf_builder.

Definition at line 26 of file pdf1d_builder.cxx.


Member Data Documentation

Definition at line 22 of file pdf1d_mixture_builder.h.

Definition at line 23 of file pdf1d_mixture_builder.h.

Definition at line 24 of file pdf1d_mixture_builder.h.

Whether weights changed during iterations.

Definition at line 27 of file pdf1d_mixture_builder.h.


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

Generated on Sun Nov 22 06:23:40 2009 for contrib/mul/pdf1d by  doxygen 1.5.5