Public Member Functions | Protected Attributes

CVarianceKernelNormalizer Class Reference

Detailed Description

VarianceKernelNormalizer divides by the ``variance''.

This effectively normalizes the vectors in feature space to variance 1 (see CVarianceKernelNormalizer)

\[ k'({\bf x},{\bf x'}) = \frac{k({\bf x},{\bf x'})}{\frac{1}{N}\sum_{i=1}^N k({\bf x}_i, {\bf x}_i) - \sum_{i,j=1}^N, k({\bf x}_i,{\bf x'}_j)/N^2} \]

Definition at line 27 of file VarianceKernelNormalizer.h.

Inheritance diagram for CVarianceKernelNormalizer:
Inheritance graph
[legend]

List of all members.

Public Member Functions

 CVarianceKernelNormalizer ()
virtual ~CVarianceKernelNormalizer ()
virtual bool init (CKernel *k)
virtual float64_t normalize (float64_t value, int32_t idx_lhs, int32_t idx_rhs)
virtual float64_t normalize_lhs (float64_t value, int32_t idx_lhs)
virtual float64_t normalize_rhs (float64_t value, int32_t idx_rhs)
virtual const char * get_name () const

Protected Attributes

float64_t meandiff
float64_t sqrt_meandiff

Constructor & Destructor Documentation

CVarianceKernelNormalizer (  ) 

default constructor

Definition at line 32 of file VarianceKernelNormalizer.h.

virtual ~CVarianceKernelNormalizer (  )  [virtual]

default destructor

Definition at line 41 of file VarianceKernelNormalizer.h.

Member Function Documentation

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

Implements CSGObject.

Definition at line 109 of file VarianceKernelNormalizer.h.

virtual bool init ( CKernel *  k  )  [virtual]

initialization of the normalizer

Parameters:
k kernel

Implements CKernelNormalizer.

Definition at line 47 of file VarianceKernelNormalizer.h.

virtual float64_t normalize ( float64_t  value,
int32_t  idx_lhs,
int32_t  idx_rhs 
) [virtual]

normalize the kernel value

Parameters:
value kernel value
idx_lhs index of left hand side vector
idx_rhs index of right hand side vector

Implements CKernelNormalizer.

Definition at line 84 of file VarianceKernelNormalizer.h.

virtual float64_t normalize_lhs ( float64_t  value,
int32_t  idx_lhs 
) [virtual]

normalize only the left hand side vector

Parameters:
value value of a component of the left hand side feature vector
idx_lhs index of left hand side vector

Implements CKernelNormalizer.

Definition at line 94 of file VarianceKernelNormalizer.h.

virtual float64_t normalize_rhs ( float64_t  value,
int32_t  idx_rhs 
) [virtual]

normalize only the right hand side vector

Parameters:
value value of a component of the right hand side feature vector
idx_rhs index of right hand side vector

Implements CKernelNormalizer.

Definition at line 103 of file VarianceKernelNormalizer.h.

Member Data Documentation

float64_t meandiff [protected]

scaling constant

Definition at line 113 of file VarianceKernelNormalizer.h.

float64_t sqrt_meandiff [protected]

square root of scaling constant

Definition at line 115 of file VarianceKernelNormalizer.h.

The documentation for this class was generated from the following file:
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines
SHOGUN Machine Learning Toolbox - Documentation