CGaussianShortRealKernel Class Reference

Detailed Description

The well known Gaussian kernel (swiss army knife for SVMs) on dense short-real valued features.

It is computed as

where is the kernel width.

Definition at line 31 of file GaussianShortRealKernel.h.

Inheritance diagram for CGaussianShortRealKernel:

Public Member Functions
	CGaussianShortRealKernel ()
	CGaussianShortRealKernel (int32_t size, float64_t width)
	CGaussianShortRealKernel (CSimpleFeatures< float32_t > *l, CSimpleFeatures< float32_t > *r, float64_t width, int32_t size=10)
virtual	~CGaussianShortRealKernel ()
virtual bool	init (CFeatures *l, CFeatures *r)
virtual EKernelType	get_kernel_type ()
virtual const char *	get_name () const
virtual void	register_params ()
Public Member Functions inherited from CDotKernel
	CDotKernel ()
	CDotKernel (int32_t cachesize)
	CDotKernel (CFeatures *l, CFeatures *r)
virtual EFeatureClass	get_feature_class ()
virtual EFeatureType	get_feature_type ()
Public Member Functions inherited from CKernel
	CKernel ()
	CKernel (int32_t size)
	CKernel (CFeatures *l, CFeatures *r, int32_t size)
virtual	~CKernel ()
float64_t	kernel (int32_t idx_a, int32_t idx_b)
SGMatrix< float64_t >	get_kernel_matrix ()
virtual SGVector< float64_t >	get_kernel_col (int32_t j)
virtual SGVector< float64_t >	get_kernel_row (int32_t i)
template<class T >
SGMatrix< T >	get_kernel_matrix ()
virtual bool	set_normalizer (CKernelNormalizer *normalizer)
virtual CKernelNormalizer *	get_normalizer ()
virtual bool	init_normalizer ()
virtual void	cleanup ()
void	load (CFile *loader)
void	save (CFile *writer)
CFeatures *	get_lhs ()
CFeatures *	get_rhs ()
virtual int32_t	get_num_vec_lhs ()
virtual int32_t	get_num_vec_rhs ()
virtual bool	has_features ()
bool	get_lhs_equals_rhs ()
virtual void	remove_lhs_and_rhs ()
virtual void	remove_lhs ()
virtual void	remove_rhs ()
	takes all necessary steps if the rhs is removed from kernel More...
void	set_cache_size (int32_t size)
int32_t	get_cache_size ()
void	list_kernel ()
bool	has_property (EKernelProperty p)
virtual void	clear_normal ()
virtual void	add_to_normal (int32_t vector_idx, float64_t weight)
EOptimizationType	get_optimization_type ()
virtual void	set_optimization_type (EOptimizationType t)
bool	get_is_initialized ()
virtual bool	init_optimization (int32_t count, int32_t *IDX, float64_t *weights)
virtual bool	delete_optimization ()
bool	init_optimization_svm (CSVM *svm)
virtual float64_t	compute_optimized (int32_t vector_idx)
virtual void	compute_batch (int32_t num_vec, int32_t *vec_idx, float64_t *target, int32_t num_suppvec, int32_t *IDX, float64_t *alphas, float64_t factor=1.0)
float64_t	get_combined_kernel_weight ()
void	set_combined_kernel_weight (float64_t nw)
virtual int32_t	get_num_subkernels ()
virtual void	compute_by_subkernel (int32_t vector_idx, float64_t *subkernel_contrib)
virtual const float64_t *	get_subkernel_weights (int32_t &num_weights)
virtual void	set_subkernel_weights (SGVector< float64_t > weights)
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)
SGIO *	get_global_io ()
void	set_global_parallel (Parallel *parallel)
Parallel *	get_global_parallel ()
void	set_global_version (Version *version)
Version *	get_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)
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()
template<>
void	set_generic ()

Protected Member Functions
virtual float64_t	compute (int32_t idx_a, int32_t idx_b)
Protected Member Functions inherited from CKernel
void	set_property (EKernelProperty p)
void	unset_property (EKernelProperty p)
void	set_is_initialized (bool p_init)
int32_t	compute_row_start (int64_t offs, int32_t n, bool symmetric)
virtual void	load_serializable_post () throw (ShogunException)
virtual void	save_serializable_pre () throw (ShogunException)
virtual void	save_serializable_post () throw (ShogunException)
Protected Member Functions inherited from CSGObject
virtual void	load_serializable_pre () throw (ShogunException)

Protected Attributes
float64_t	width
Protected Attributes inherited from CKernel
int32_t	cache_size
	cache_size in MB More...
KERNELCACHE_ELEM *	kernel_matrix
CFeatures *	lhs
	feature vectors to occur on left hand side More...
CFeatures *	rhs
	feature vectors to occur on right hand side More...
bool	lhs_equals_rhs
	lhs More...
int32_t	num_lhs
	number of feature vectors on left hand side More...
int32_t	num_rhs
	number of feature vectors on right hand side More...
float64_t	combined_kernel_weight
bool	optimization_initialized
EOptimizationType	opt_type
uint64_t	properties
CKernelNormalizer *	normalizer

Additional Inherited Members
Public Attributes inherited from CSGObject
SGIO *	io
Parallel *	parallel
Version *	version
Parameter *	m_parameters
Parameter *	m_model_selection_parameters
Static Protected Member Functions inherited from CKernel
template<class T >
static void *	get_kernel_matrix_helper (void *p)

Constructor & Destructor Documentation

CGaussianShortRealKernel

(

)

default constructor

Definition at line 19 of file GaussianShortRealKernel.cpp.

CGaussianShortRealKernel	(	int32_t	size,
		float64_t	width
	)

constructor

Parameters

size	cache size
width	width

Definition at line 25 of file GaussianShortRealKernel.cpp.

CGaussianShortRealKernel	(	CSimpleFeatures< float32_t > *	l,
		CSimpleFeatures< float32_t > *	r,
		float64_t	width,
		int32_t	size = 10
	)

constructor

Parameters

l	features of left-hand side
r	features of right-hand side
width	width
size	cache size

Definition at line 31 of file GaussianShortRealKernel.cpp.

~CGaussianShortRealKernel ( )

virtual

Definition at line 39 of file GaussianShortRealKernel.cpp.

Member Function Documentation

float64_t compute ( int32_t  idx_a, int32_t  idx_b  )

protectedvirtual

compute kernel function for features a and b idx_{a,b} denote the index of the feature vectors in the corresponding feature object

Parameters

idx_a	index a
idx_b	index b

Returns

computed kernel function at indices a,b

Reimplemented from CDotKernel.

Definition at line 49 of file GaussianShortRealKernel.cpp.

virtual EKernelType get_kernel_type ( )

virtual

return what type of kernel we are

Returns

kernel type GAUSSIAN

Implements CDotKernel.

Definition at line 68 of file GaussianShortRealKernel.h.

virtual const char* get_name ( ) const

virtual

return the kernel's name

Returns

name GaussianShortReal

Reimplemented from CDotKernel.

Definition at line 74 of file GaussianShortRealKernel.h.

bool init ( CFeatures *  l, CFeatures *  r  )

virtual

initialize kernel

Parameters

l	features of left-hand side
r	features of right-hand side

Returns

if initializing was successful

Reimplemented from CDotKernel.

Definition at line 43 of file GaussianShortRealKernel.cpp.

void register_params ( )

virtual

register the parameters

Reimplemented from CKernel.

Definition at line 70 of file GaussianShortRealKernel.cpp.

Member Data Documentation

float64_t width

protected

width

Definition at line 92 of file GaussianShortRealKernel.h.

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

• GaussianShortRealKernel.h
• GaussianShortRealKernel.cpp