ModErn Text Analysis
META Enumerates Textual Applications
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Implements the absolute discounting smoothing method. More...
#include <absolute_discount.h>
Public Member Functions | |
absolute_discount (double delta=0.7) | |
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 = "absolute-discount" |
The identifier of this ranker. | |
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 | delta_ |
the absolute discounting parameter | |
Implements the absolute discounting smoothing method.
meta::index::absolute_discount::absolute_discount | ( | double | delta = 0.7 | ) |
delta |
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overridevirtual |
Calculates the smoothed probability of a term.
sd | score_data for the current query |
Implements meta::index::language_model_ranker.
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overridevirtual |
A document-dependent constant.
sd | score_data for the current query |
Implements meta::index::language_model_ranker.