Public Member Functions | Protected Member Functions | Protected Attributes

CSigmoidKernel Class Reference


Detailed Description

The standard Sigmoid kernel computed on dense real valued features.

Formally, it is computed as

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

Definition at line 29 of file SigmoidKernel.h.

Inheritance diagram for CSigmoidKernel:
Inheritance graph
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List of all members.

Public Member Functions

 CSigmoidKernel ()
 CSigmoidKernel (int32_t size, float64_t gamma, float64_t coef0)
 CSigmoidKernel (CDotFeatures *l, CDotFeatures *r, int32_t size, float64_t gamma, float64_t coef0)
virtual ~CSigmoidKernel ()
virtual bool init (CFeatures *l, CFeatures *r)
virtual void cleanup ()
virtual EKernelType get_kernel_type ()
virtual const char * get_name () const

Protected Member Functions

virtual float64_t compute (int32_t idx_a, int32_t idx_b)

Protected Attributes

float64_t gamma
float64_t coef0

Constructor & Destructor Documentation

CSigmoidKernel (  ) 

default constructor

Definition at line 17 of file SigmoidKernel.cpp.

CSigmoidKernel ( int32_t  size,
float64_t  gamma,
float64_t  coef0 
)

constructor

Parameters:
size cache size
gamma gamma
coef0 coefficient 0

Definition at line 22 of file SigmoidKernel.cpp.

CSigmoidKernel ( CDotFeatures l,
CDotFeatures 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 31 of file SigmoidKernel.cpp.

~CSigmoidKernel (  )  [virtual]

Definition at line 43 of file SigmoidKernel.cpp.


Member Function Documentation

void cleanup (  )  [virtual]

clean up kernel

Reimplemented from CKernel.

Definition at line 48 of file SigmoidKernel.cpp.

virtual float64_t 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

Reimplemented from CDotKernel.

Definition at line 88 of file SigmoidKernel.h.

virtual EKernelType get_kernel_type (  )  [virtual]

return what type of kernel we are

Returns:
kernel type SIGMOID

Implements CDotKernel.

Definition at line 71 of file SigmoidKernel.h.

virtual const char* get_name ( void   )  const [virtual]

return the kernel's name

Returns:
name Sigmoid

Reimplemented from CDotKernel.

Definition at line 77 of file SigmoidKernel.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 52 of file SigmoidKernel.cpp.


Member Data Documentation

float64_t coef0 [protected]

coefficient 0

Definition at line 100 of file SigmoidKernel.h.

float64_t gamma [protected]

gamma

Definition at line 98 of file SigmoidKernel.h.


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