The pivoted document length normalization ranking function. More...

Inheritance diagram for meta::index::pivoted_length:

Public Member Functions
	pivoted_length (double s=default_s)

double	score_one (const score_data &sd) override

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

virtual	~ranker ()=default
	Default destructor.

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

static const constexpr double	default_s = 0.20
	Default value of s parameter.

Private Attributes
const double	s_
	s parameter for pivoted_length normalization

Detailed Description

The pivoted document length normalization ranking function.

See also: Amit Singal, Chris Buckley, and Mandar Mitra. Pivoted document length normalization. SIGIR '96, pages 21-29.

Constructor & Destructor Documentation

meta::index::pivoted_length::pivoted_length ( double s = default_s )

Parameters

s

double meta::index::pivoted_length::score_one ( const score_data & sd )

overridevirtual

Parameters

sd	the score_data for this query

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