Debugging ZCA whitening
Updated PCA code
Solved problem with Lua stack at StackANNComponent:unroll() method
Added is_best method to holdout training class
Added posibility of take-n components in PCA whitening
Added PCA and ZCA whitening ANN components
More for PCA analysis
sanity check
Implementing PCA and ZCA whitening ANN components as DotProductANNComponent wrappers
Added ZCA test
Solved problem in method clone of confussion matrix