lemga::kernel::Sigmoid

Sigmoid Struct Reference

Sigmoid kernel $\tanh(\gamma\left<u,v\right>+c_0)$. More...

#include <kernel.h>

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List of all members.

Public Member Functions

 Sigmoid (REAL g=0.5, REAL c0=0)
 Sigmoid (std::istream &is)
virtual const id_t & id () const
virtual Sigmoid * create () const
 Create a new object using the default constructor.
virtual Sigmoid * clone () const
 Create a new object by replicating itself.
virtual REAL operator() (const Input &a, const Input &b) const
 The inner-product of two input vectors.
virtual void set_params (SVM_detail *) const

Public Attributes

REAL gamma
REAL coef0

Protected Member Functions

virtual bool serialize (std::ostream &, ver_list &) const
virtual bool unserialize (std::istream &, ver_list &, const id_t &=NIL_ID)

Detailed Description

Sigmoid kernel $\tanh(\gamma\left<u,v\right>+c_0)$.

Definition at line 179 of file kernel.h.

Constructor & Destructor Documentation

Sigmoid (  REAL  g = 0.5,
REAL  c0 = 0
)  [inline]
 

Definition at line 181 of file kernel.h.

Sigmoid (  std::istream &  is  )  [inline, explicit]
 

Definition at line 182 of file kernel.h.

Member Function Documentation

virtual Sigmoid* clone (   )  const [inline, virtual]
 

Create a new object by replicating itself.

Returns:
A pointer to the new copy.
The code for a derived class Derived is always 
 return new Derived(*this);
Though seemingly redundant, it helps to copy an object without knowing the real type of the object.
See also:
C++ FAQ Lite 20.6

Implements Kernel.

Definition at line 186 of file kernel.h.

virtual Sigmoid* create (   )  const [inline, virtual]
 

Create a new object using the default constructor.

The code for a derived class Derived is always 

 return new Derived();

Implements Kernel.

Definition at line 185 of file kernel.h.

virtual const id_t& id (   )  const [virtual]
 

Returns:
Class ID string (class name)

Implements Object.

virtual REAL operator() (  const Input &  a,
const Input &  b
)  const [inline, virtual]
 

The inner-product of two input vectors.

Implements Kernel.

Definition at line 188 of file kernel.h.

References DOTPROD.

bool serialize (  std::ostream &  ,
ver_list & 
)  const [protected, virtual]
 

Reimplemented from Kernel.

Definition at line 55 of file kernel.cpp.

References Sigmoid::coef0, Sigmoid::gamma, and SERIALIZE_PARENT.

void set_params (  SVM_detail *   )  const [virtual]
 

In order to keep the SVM interface simple and avoid member functions specific to kernels (e.g., set_gamma()), we use Kernel to pass kernel parameters to SVM_detail.

Implements Kernel.

Definition at line 163 of file svm.cpp.

References Sigmoid::coef0, and Sigmoid::gamma.

bool unserialize (  std::istream &  ,
ver_list &  ,
const id_t &  = NIL_ID
)  [protected, virtual]
 

Reimplemented from Kernel.

Definition at line 60 of file kernel.cpp.

References Sigmoid::coef0, Sigmoid::gamma, Object::NIL_ID, and UNSERIALIZE_PARENT.

Member Data Documentation

REAL coef0
 

Definition at line 180 of file kernel.h.

Referenced by Sigmoid::serialize(), Sigmoid::set_params(), and Sigmoid::unserialize().

REAL gamma
 

Definition at line 180 of file kernel.h.

Referenced by Sigmoid::serialize(), Sigmoid::set_params(), and Sigmoid::unserialize().

The documentation for this struct was generated from the following files:
Generated on Wed Nov 8 08:17:42 2006 for LEMGA by  doxygen 1.4.6