comparison toolboxes/SVM-light/src/kernel.h @ 0:e9a9cd732c1e tip

first hg version after svn

+/************************************************************************/
+/*                                                                      */
+/*   kernel.h                                                           */
+/*                                                                      */
+/*   User defined kernel function. Feel free to plug in your own.       */
+/*                                                                      */
+/*   Copyright: Thorsten Joachims                                       */
+/*   Date: 16.12.97                                                     */
+/*                                                                      */
+/************************************************************************/
+
+/* KERNEL_PARM is defined in svm_common.h The field 'custom' is reserved for */
+/* parameters of the user defined kernel. You can also access and use */
+/* the parameters of the other kernels. Just replace the line 
+             return((double)(1.0)); 
+   with your own kernel. */
+
+  /* Example: The following computes the polynomial kernel. sprod_ss
+              computes the inner product between two sparse vectors. 
+
+      return((CFLOAT)pow(kernel_parm->coef_lin*sprod_ss(a->words,b->words)
+             +kernel_parm->coef_const,(double)kernel_parm->poly_degree)); 
+  */
+
+/* If you are implementing a kernel that is not based on a
+   feature/value representation, you might want to make use of the
+   field "userdefined" in SVECTOR. By default, this field will contain
+   whatever string you put behind a # sign in the example file. So, if
+   a line in your training file looks like
+
+   -1 1:3 5:6 #abcdefg
+
+   then the SVECTOR field "words" will contain the vector 1:3 5:6, and
+   "userdefined" will contain the string "abcdefg". */
+
+double custom_kernel(KERNEL_PARM *kernel_parm, SVECTOR *a, SVECTOR *b) 
+     /* plug in you favorite kernel */                          
+{
+  return((double)(1.0)); 
+}