M-theory

@article{anselmi2013unsupervised,   title={Unsupervised Learning of Invariant Representations in Hierarchical Architectures},   author={Anselmi, Fabio and Leibo, Joel Z and Rosasco, Lorenzo and Mutch, Jim and Tacchetti, Andrea and Poggio, Tomaso},   journal={arXiv preprint arXiv:1311.4158},   year={2013} }