source: trunk/src/KernelFunction.h @ 67

// $Id: KernelFunction.h 67 2004-04-27 15:04:31Z peter $

#ifndef _theplu_cpptools_kernel_function_
#define _theplu_cpptools_kernel_function_

namespace theplu {

namespace gslapi {
  class vector;
}

namespace cpptools {

  /**
     Virtual Class calculating one element in the kernel matrix (i.e. the 
     scalar product in feature space) from the two corresponding vector in the 
     data matrix. So far is only the polynomial kernel implemented.
   */
  class KernelFunction 
  {
    
  public:
    /**
       Constructor
    */    
    KernelFunction(void) {};
    /**
       Destructor
    */
    virtual ~KernelFunction(void) {};
    
    virtual double operator()(const gslapi::vector&,
                              const gslapi::vector&) const = 0; 
    
    virtual double operator()(const gslapi::vector&,
                              const gslapi::vector&,
                              const gslapi::vector&,
                              const gslapi::vector&) const = 0; 
    
  }; // class KernelFunction

}} // of namespace cpptools and namespace theplu

#endif