In this example toy data is being processed using Laplacian Eigenmaps
algorithm as described in

Belkin, M., & Niyogi, P. (2002). 
Laplacian Eigenmaps and Spectral Techniques for Embedding and Clustering. 
Science, 14, 585-591. MIT Press. 
Retrieved from http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.19.9400&rep=rep1&type=pdf

The number of neighbors for the kNN graph and the heat distribution
coeffcient is set before processing the data
