VW::kskip_ngram_transformer Class Reference

#include <kskip_ngram_transformer.h>

Public Member Functions
void	generate_grams (example *ex)
std::vector< std::string >	get_initial_ngram_definitions () const
std::vector< std::string >	get_initial_skip_definitions () const
	kskip_ngram_transformer (const kskip_ngram_transformer &other)=default
kskip_ngram_transformer &	operator= (const kskip_ngram_transformer &other)=default
	kskip_ngram_transformer (kskip_ngram_transformer &&other)=default
kskip_ngram_transformer &	operator= (kskip_ngram_transformer &&other)=default

Static Public Member Functions
static kskip_ngram_transformer	build (const std::vector< std::string > &grams, const std::vector< std::string > &skips, bool quiet, VW::io::logger &logger)

Constructor & Destructor Documentation

kskip_ngram_transformer() [1/2]

VW::kskip_ngram_transformer::kskip_ngram_transformer ( const kskip_ngram_transformer &  other )

default

kskip_ngram_transformer() [2/2]

VW::kskip_ngram_transformer::kskip_ngram_transformer ( kskip_ngram_transformer &&  other )

default

Member Function Documentation

build()

static kskip_ngram_transformer VW::kskip_ngram_transformer::build ( const std::vector< std::string > &  grams, const std::vector< std::string > &  skips, bool  quiet, VW::io::logger &  logger  )

static

generate_grams()

void VW::kskip_ngram_transformer::generate_grams

(

example *

ex

)

This function adds k-skip-n-grams to the feature vector. Definition of k-skip-n-grams: Consider a feature vector - a, b, c, d, e, f 2-skip-2-grams would be - ab, ac, ad, bc, bd, be, cd, ce, cf, de, df, ef 1-skip-3-grams would be - abc, abd, acd, ace, bcd, bce, bde, bdf, cde, cdf, cef, def Note that for a n-gram, (n-1)-grams, (n-2)-grams... 2-grams are also appended The k-skip-n-grams are appended to the feature vector. Hash is evaluated using the principle h(a, b) = h(a)*X + h(b), where X is a random no. 32 random nos. are maintained in an array and are used in the hashing.

get_initial_ngram_definitions()

std::vector< std::string > VW::kskip_ngram_transformer::get_initial_ngram_definitions ( ) const

inline

get_initial_skip_definitions()

std::vector< std::string > VW::kskip_ngram_transformer::get_initial_skip_definitions ( ) const

inline

operator=() [1/2]

kskip_ngram_transformer & VW::kskip_ngram_transformer::operator= ( const kskip_ngram_transformer &  other )

default

operator=() [2/2]

kskip_ngram_transformer & VW::kskip_ngram_transformer::operator= ( kskip_ngram_transformer &&  other )

default

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

• /nix/store/2saqbz278bj3pvhbfxlcc50cjbvs3h0h-source/vowpalwabbit/core/include/vw/core/kskip_ngram_transformer.h