sparse-filtering
================

Unsupervised feature learning based on sparse-filtering

This implements the method described `Jiquan Ngiam, Pang Wei Koh,
Zhenghao Chen, Sonia Bhaskar, Andrew Y. Ng:
Sparse Filtering. NIPS 2011: 1125-1133`
and is based on the Matlab code provided in the supplementary material
