RBFPREIMG |
RBF pre-image by Schoelkopf's fixed-point algorithm.
Synopsis:
x = rbfpreimg( model )
x = rbfpreimg( model, options )
x = rbfpreimg( model, options, init_point )
Description:
x = rbfpreimg( model ) it is an implementation of the
Schoelkopf's fixed-point algorithm to solve the pre-image
problem for kernel expansion wiht RBF kernel [Schol98a].
The kernel expansion is given in the input structure model.
x = rbfpreimg( model, options ) use structure options to
set up control parameters:
tmax ... maximal number of iterations.
eps ... minimal change in the norm of the optimized vector.
x = rbfpreimg( model, options, init_point ) use to set up
starting point of the optimization otherwise it is seleceted
randomly.
Input:
model [struct] Kernel expansion:
.Alpha [nsv x 1] Coefficients of the kernel expansion.
.sv.X [dim x nsv] Vectors of defining the expansion.
.options.ker [string] Must be equl to 'rbf'.
.options.arg [1x1] Argument of the RBF kernel.
options [struct] Control parameters:
.tmax [1x1] Maximal number of iterations (default 1e6).
.eps [1x1] Minimal change of the optimized vector x.
init_point [dim x 1] Initial point of optimization.
Output:
x [dim x 1] Pre-image of the RBF kernel expansion.
See also
RBFPREIMG2, RBFPREIMG3, RSRBF, KPCAREC.
About: Statistical Pattern Recognition Toolbox
(C) 1999-2003, Written by Vojtech Franc and Vaclav Hlavac
Czech Technical University Prague
Faculty of Electrical Engineering
Center for Machine Perception
Modifications:
4-may-2004, VF
1-July-2003, VF
30-June-2003, VF