CWDFeatures Class Reference


Detailed Description

Features that compute the Weighted Degreee Kernel feature space explicitly.

See also:
CWeightedDegreeStringKernel

Definition at line 27 of file WDFeatures.h.

Inheritance diagram for CWDFeatures:
Inheritance graph
[legend]

List of all members.

Public Member Functions

 CWDFeatures (CStringFeatures< uint8_t > *str, int32_t order, int32_t from_order)
 CWDFeatures (const CWDFeatures &orig)
virtual ~CWDFeatures ()
virtual int32_t get_dim_feature_space ()
virtual float64_t dot (int32_t vec_idx1, int32_t vec_idx2)
virtual float64_t dense_dot (int32_t vec_idx1, const float64_t *vec2, int32_t vec2_len)
virtual void add_to_dense_vec (float64_t alpha, int32_t vec_idx1, float64_t *vec2, int32_t vec2_len, bool abs_val=false)
virtual int32_t get_nnz_features_for_vector (int32_t num)
virtual CFeaturesduplicate () const
virtual EFeatureType get_feature_type ()
virtual EFeatureClass get_feature_class ()
virtual int32_t get_num_vectors ()
virtual int32_t get_size ()
virtual const char * get_name () const

Protected Member Functions

void set_normalization_const ()
void set_wd_weights ()

Protected Attributes

CStringFeatures< uint8_t > * strings
float64_t normalization_const
int32_t degree
int32_t from_degree
int32_t string_length
int32_t num_strings
int32_t alphabet_size
int32_t w_dim
float64_twd_weights

Constructor & Destructor Documentation

CWDFeatures ( CStringFeatures< uint8_t > *  str,
int32_t  order,
int32_t  from_order 
)

constructor

Parameters:
str stringfeatures (of bytes)
order of wd kernel
from_order use first order weights from higher order weighting

Definition at line 16 of file WDFeatures.cpp.

CWDFeatures ( const CWDFeatures orig  ) 

copy constructor

Definition at line 37 of file WDFeatures.cpp.

~CWDFeatures (  )  [virtual]

destructor

Definition at line 52 of file WDFeatures.cpp.


Member Function Documentation

void add_to_dense_vec ( float64_t  alpha,
int32_t  vec_idx1,
float64_t vec2,
int32_t  vec2_len,
bool  abs_val = false 
) [virtual]

add vector 1 multiplied with alpha to dense vector2

Parameters:
alpha scalar alpha
vec_idx1 index of first vector
vec2 pointer to real valued vector
vec2_len length of real valued vector
abs_val if true add the absolute value

Implements CDotFeatures.

Definition at line 121 of file WDFeatures.cpp.

float64_t dense_dot ( int32_t  vec_idx1,
const float64_t vec2,
int32_t  vec2_len 
) [virtual]

compute dot product between vector1 and a dense vector

Parameters:
vec_idx1 index of first vector
vec2 pointer to real valued vector
vec2_len length of real valued vector

Implements CDotFeatures.

Definition at line 83 of file WDFeatures.cpp.

float64_t dot ( int32_t  vec_idx1,
int32_t  vec_idx2 
) [virtual]

compute dot product between vector1 and vector2, appointed by their indices

Parameters:
vec_idx1 index of first vector
vec_idx2 index of second vector

Implements CDotFeatures.

Definition at line 57 of file WDFeatures.cpp.

CFeatures * duplicate (  )  const [virtual]

duplicate feature object

Returns:
feature object

Implements CFeatures.

Definition at line 185 of file WDFeatures.cpp.

virtual int32_t get_dim_feature_space (  )  [virtual]

obtain the dimensionality of the feature space

(not mix this up with the dimensionality of the input space, usually obtained via get_num_features())

Returns:
dimensionality

Implements CDotFeatures.

Definition at line 52 of file WDFeatures.h.

virtual EFeatureClass get_feature_class (  )  [virtual]

get feature class

Returns:
feature class

Implements CFeatures.

Definition at line 112 of file WDFeatures.h.

virtual EFeatureType get_feature_type (  )  [virtual]

get feature type

Returns:
templated feature type

Implements CFeatures.

Definition at line 103 of file WDFeatures.h.

virtual const char* get_name (  )  const [virtual]
Returns:
object name

Implements CSGObject.

Definition at line 128 of file WDFeatures.h.

virtual int32_t get_nnz_features_for_vector ( int32_t  num  )  [virtual]

get number of non-zero features in vector

Parameters:
num which vector
Returns:
number of non-zero features in vector

Implements CDotFeatures.

Definition at line 88 of file WDFeatures.h.

virtual int32_t get_num_vectors (  )  [virtual]

get number of examples/vectors

abstract base method

Returns:
number of examples/vectors

Implements CFeatures.

Definition at line 117 of file WDFeatures.h.

virtual int32_t get_size (  )  [virtual]

get memory footprint of one feature

abstract base method

Returns:
memory footprint of one feature

Implements CFeatures.

Definition at line 122 of file WDFeatures.h.

void set_normalization_const (  )  [protected]

set normalization constant

Definition at line 175 of file WDFeatures.cpp.

void set_wd_weights (  )  [protected]

create wd kernel weighting heuristic

Definition at line 160 of file WDFeatures.cpp.


Member Data Documentation

int32_t alphabet_size [protected]

size of alphabet

Definition at line 153 of file WDFeatures.h.

int32_t degree [protected]

degree

Definition at line 145 of file WDFeatures.h.

int32_t from_degree [protected]

from degree

Definition at line 147 of file WDFeatures.h.

normalization const

Definition at line 142 of file WDFeatures.h.

int32_t num_strings [protected]

number of strings

Definition at line 151 of file WDFeatures.h.

int32_t string_length [protected]

length of string in vector

Definition at line 149 of file WDFeatures.h.

CStringFeatures<uint8_t>* strings [protected]

stringfeatures the wdfeatures are based on

Definition at line 139 of file WDFeatures.h.

int32_t w_dim [protected]

w dim

Definition at line 155 of file WDFeatures.h.

float64_t* wd_weights [protected]

wd weights

Definition at line 157 of file WDFeatures.h.


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

SHOGUN Machine Learning Toolbox - Documentation