In this example toy data is being preprocessed using the Locally Linear Embedding (LLE)
algorithm as described in

Saul, L. K., Ave, P., Park, F., & Roweis, S. T. (2001).
An Introduction to Locally Linear Embedding. Available from, 290(5500), 2323-2326.
Retrieved from: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.123.7319&rep=rep1&type=pdf

The number of neighbors used during the linear reconstruction step of the algorithm is set
before processing of the data.
