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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]

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
- Public Member Functions inherited from CKernelNormalizer
 CKernelNormalizer ()
virtual ~CKernelNormalizer ()
virtual void register_params ()
ENormalizerType get_normalizer_type ()
void set_normalizer_type (ENormalizerType type)
- Public Member Functions inherited from CSGObject
 CSGObject ()
 CSGObject (const CSGObject &orig)
virtual ~CSGObject ()
virtual bool is_generic (EPrimitiveType *generic) const
template<class T >
void set_generic ()
void unset_generic ()
virtual void print_serializable (const char *prefix="")
virtual bool save_serializable (CSerializableFile *file, const char *prefix="")
virtual bool load_serializable (CSerializableFile *file, const char *prefix="")
void set_global_io (SGIO *io)
SGIOget_global_io ()
void set_global_parallel (Parallel *parallel)
Parallelget_global_parallel ()
void set_global_version (Version *version)
Versionget_global_version ()
SGVector< char * > get_modelsel_names ()
char * get_modsel_param_descr (const char *param_name)
index_t get_modsel_param_index (const char *param_name)

Protected Attributes

float64_t meandiff
float64_t sqrt_meandiff
- Protected Attributes inherited from CKernelNormalizer
ENormalizerType m_type

Additional Inherited Members

- Public Attributes inherited from CSGObject
SGIOio
Parallelparallel
Versionversion
Parameterm_parameters
Parameterm_model_selection_parameters
- Protected Member Functions inherited from CSGObject
virtual void load_serializable_pre () throw (ShogunException)
virtual void load_serializable_post () throw (ShogunException)
virtual void save_serializable_pre () throw (ShogunException)
virtual void save_serializable_post () throw (ShogunException)

Constructor & Destructor Documentation

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 ( ) 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
kkernel

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
valuekernel value
idx_lhsindex of left hand side vector
idx_rhsindex 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
valuevalue of a component of the left hand side feature vector
idx_lhsindex 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
valuevalue of a component of the right hand side feature vector
idx_rhsindex 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:

SHOGUN Machine Learning Toolbox - Documentation