In this example toy data is being processed using the kernel PCA algorithm
as described in

Schölkopf, B., Smola, A. J., & Muller, K. R. (1999).
Kernel Principal Component Analysis.
Advances in kernel methods support vector learning, 1327(3), 327-352. MIT Press.
Retrieved from http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.32.8744i

A gaussian kernel is used for the processing.
