Efficient MATLAB implementation of online Principal Subspace Projection algorithms (Fast Similarity Matching[1], Incremental PCA[2,3], and Candid Covariance Incremental PCA[2,4])

For the more complete Python version please go to the link online-psp

Clone the repository or unzip the source and add recursively folders from the src folder to the MATLAB path

k -> subspace dimension
d -> number of features
% we suggest to standardize data using the standardize_data function
[X,~,~] = standardize_data(X,0,0);

fsm = FSM(k, d, [], [], [], []);
for i = 1:n    
    fsm.fit_next(x(:,i)');
end

components = fsm.get_components([]);

For more detailed examples explore the demo_XXX.m files

[1] Pehlevan, Cengiz, Anirvan M. Sengupta, and Dmitri B. Chklovskii. "Why do similarity matching objectives lead to Hebbian/anti-Hebbian networks?." Neural computation 30, no. 1 (2018): 84-124.

[2] Cardot, Hervé, and David Degras. "Online Principal Component Analysis in High Dimension: Which Algorithm to Choose?." arXiv preprint arXiv:1511.03688 (2015).

[3] Arora, R., Cotter, A., Livescu, K. and Srebro, N., 2012, October. Stochastic optimization for PCA and PLS. In Communication, Control, and Computing (Allerton), 2012 50th Annual Allerton Conference on (pp. 861-868). IEEE.

[4] Weng, J., Zhang, Y. and Hwang, W.S., 2003. Candid covariance-free incremental principal component analysis. IEEE Transactions on Pattern Analysis and Machine Intelligence, 25(8), pp.1034-1040.

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