Implements Bayesian smoothing with a Dirichlet prior. More...

Inheritance diagram for meta::index::dirichlet_prior:

Public Member Functions
	dirichlet_prior (double mu=default_mu)

double	smoothed_prob (const score_data &sd) const override
	Calculates the smoothed probability of a term. More...

double	doc_constant (const score_data &sd) const override
	A document-dependent constant. More...

Public Member Functions inherited from meta::index::language_model_ranker
double	score_one (const score_data &sd) override

double	initial_score (const score_data &sd) const override
	Computes the constant contribution to the score of a particular document. More...

virtual	~language_model_ranker ()=default
	Default destructor.

Public Member Functions inherited from meta::index::ranker
std::vector< std::pair< doc_id, double > >	score (inverted_index &idx, corpus::document &query, uint64_t num_results=10, const std::function< bool(doc_id d_id)> &filter=[](doc_id){return true;})

virtual	~ranker ()=default
	Default destructor.

Static Public Attributes
static const std::string	id = "dirichlet-prior"
	Identifier for this ranker.

static const constexpr double	default_mu = 2000
	Default value of mu.

Static Public Attributes inherited from meta::index::language_model_ranker
static const std::string	id = "language-model"
	The identifier for this ranker.

Private Attributes
const double	mu_
	the Dirichlet prior parameter

Detailed Description

Implements Bayesian smoothing with a Dirichlet prior.

Constructor & Destructor Documentation

meta::index::dirichlet_prior::dirichlet_prior ( double mu = default_mu )

Parameters

mu

double meta::index::dirichlet_prior::smoothed_prob ( const score_data & sd ) const

overridevirtual

Calculates the smoothed probability of a term.

Parameters

sd	score_data for the current query

double meta::index::dirichlet_prior::doc_constant ( const score_data & sd ) const

overridevirtual

A document-dependent constant.

Parameters

sd	score_data for the current query

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