Represents a Dirichlet distribution. More...

#include <dirichlet.h>

Public Member Functions
	dirichlet (double alpha, uint64_t n)
	Constructs a symmetric Dirichlet with concentration parameter \(\alpha\) and dimension \(n\). More...

template<class Iter >
	dirichlet (Iter begin, Iter end)
	Constructs a Dirichlet from a sequence of parameters that make up the parameter vector \(\mathbf{\alpha}\). More...

	dirichlet (const dirichlet &other)
	Copy constructor.

	dirichlet (dirichlet &&other)
	Move constructor.

dirichlet &	operator= (dirichlet rhs)
	Assignment operator.

	~dirichlet ()
	Destructor.

double	pseudo_counts (const T &event) const
	Obtains the number of "pseudo-counts" associated with a given event when used as a prior for a multinomial distribution. More...

double	pseudo_counts () const
	Obtains the number of total "pseudo-counts" associated with this distribution when used as a prior for a multinomial distribution.

void	swap (dirichlet &other)
	Swaps this dirichlet with the parameter. More...

Private Attributes
enum meta::stats::dirichlet::type	type_

union meta::stats::dirichlet::parameters	params_

double	alpha_sum_

Detailed Description

Represents a Dirichlet distribution.

Typically used as a prior for multinomials in the language modeling, topic modeling, classification, and sequence labeling components.

Constructor & Destructor Documentation

template<class T >

meta::stats::dirichlet< T >::dirichlet	(	double	alpha,
		uint64_t	n
	)

Constructs a symmetric Dirichlet with concentration parameter \(\alpha\) and dimension \(n\).

Parameters

alpha	The concentration parameter
n	The dimensionality of the Dirichlet

template<class T >

template<class Iter >

meta::stats::dirichlet< T >::dirichlet	(	Iter	begin,
		Iter	end
	)

Constructs a Dirichlet from a sequence of parameters that make up the parameter vector \(\mathbf{\alpha}\).

Each element is expected to be a std::pair<T, double>.

Parameters

begin	An iterator to the beginning of the sequence
end	An iterator to the ending of the sequence

template<class T>

double meta::stats::dirichlet< T >::pseudo_counts ( const T & event ) const

Obtains the number of "pseudo-counts" associated with a given event when used as a prior for a multinomial distribution.

Parameters

event The event in question

template<class T >

void meta::stats::dirichlet< T >::swap ( dirichlet< T > & other )

Swaps this dirichlet with the parameter.

Parameters

other The dirichlet to swap with

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