2D PCA implementation is incomplete (and untested)
Created by: laurentes
Ages ago, I've started to implement the 2D PCA algorithm described in the following paper: Two-Dimensional PCA: A New Approach to Appearance-Based Face Representation and Recognition, Yang et. al, TPAMI 2004.
This should be finalized or removed before the next major release.
More recent work on the Generalized PCA (e.g. Vidal, and co. http://cis.jhu.edu/~rvidal/) might be considered.