CSigmoidKernel Class Reference

Inheritance diagram for CSigmoidKernel:

Inheritance graph
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List of all members.

Public Member Functions

 CSigmoidKernel (int32_t size, float64_t gamma, float64_t coef0)
 CSigmoidKernel (CRealFeatures *l, CRealFeatures *r, int32_t size, float64_t gamma, float64_t coef0)
virtual ~CSigmoidKernel ()
virtual bool init (CFeatures *l, CFeatures *r)
virtual void cleanup ()
virtual bool load_init (FILE *src)
virtual bool save_init (FILE *dest)
virtual EKernelType get_kernel_type ()
virtual const char * get_name ()

Protected Member Functions

virtual float64_t compute (int32_t idx_a, int32_t idx_b)

Protected Attributes

float64_t gamma
float64_t coef0


Detailed Description

The standard Sigmoid kernel computed on dense real valued features as

\[ k({\bf x},{\bf x'})=\mbox{tanh}(\gamma {\bf x}\cdot{\bf x'}+c) \]

Definition at line 23 of file SigmoidKernel.h.


Constructor & Destructor Documentation

CSigmoidKernel::CSigmoidKernel ( int32_t  size,
float64_t  gamma,
float64_t  coef0 
)

constructor

Parameters:
size cache size
gamma gamma
coef0 coefficient 0

Definition at line 19 of file SigmoidKernel.cpp.

CSigmoidKernel::CSigmoidKernel ( CRealFeatures l,
CRealFeatures r,
int32_t  size,
float64_t  gamma,
float64_t  coef0 
)

constructor

Parameters:
l features of left-hand side
r features of right-hand side
size cache size
gamma gamma
coef0 coefficient 0

Definition at line 24 of file SigmoidKernel.cpp.

CSigmoidKernel::~CSigmoidKernel (  )  [virtual]

Definition at line 31 of file SigmoidKernel.cpp.


Member Function Documentation

void CSigmoidKernel::cleanup (  )  [virtual]

clean up kernel

Reimplemented from CKernel.

Definition at line 42 of file SigmoidKernel.cpp.

float64_t CSigmoidKernel::compute ( int32_t  idx_a,
int32_t  idx_b 
) [protected, virtual]

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

Implements CKernel.

Definition at line 56 of file SigmoidKernel.cpp.

virtual EKernelType CSigmoidKernel::get_kernel_type (  )  [virtual]

return what type of kernel we are

Returns:
kernel type SIGMOID

Implements CKernel.

Definition at line 76 of file SigmoidKernel.h.

virtual const char* CSigmoidKernel::get_name (  )  [virtual]

return the kernel's name

Returns:
name Sigmoid

Implements CKernel.

Definition at line 82 of file SigmoidKernel.h.

bool CSigmoidKernel::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 CSimpleKernel< float64_t >.

Definition at line 36 of file SigmoidKernel.cpp.

bool CSigmoidKernel::load_init ( FILE *  src  )  [virtual]

load kernel init_data

Parameters:
src file to load from
Returns:
if loading was successful

Implements CKernel.

Definition at line 46 of file SigmoidKernel.cpp.

bool CSigmoidKernel::save_init ( FILE *  dest  )  [virtual]

save kernel init_data

Parameters:
dest file to save to
Returns:
if saving was successful

Implements CKernel.

Definition at line 51 of file SigmoidKernel.cpp.


Member Data Documentation

coefficient 0

Definition at line 99 of file SigmoidKernel.h.

gamma

Definition at line 97 of file SigmoidKernel.h.


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

SHOGUN Machine Learning Toolbox - Documentation