scikit-learn/scikit-learn — pull request #1503 by yedtoss (2012-12-31 23:32:38+00:00)
Title: Add 2D2PCA ( Two-directional two-dimensional PCA)

I add the Two-directional two-dimensional PCA in sklearn/decomposition/pca_2d.py

Tests are added in sklearn/decomposition/tests/test_pca_2d.py

and examples are in examples/applications/face_recognition_pca_2d.py

Reference : `Daoqiang Zhang, Zhi-Hua Zhou, :
Two-directional two-dimensional PCA for efficient face representation and
recognition, Neurocomputing, Volume 69, Issues 1-3, December 2005,
Pages 224-231`