sfaExecute: Execute learned function for input data
Description
After completion of the learning phase (step="sfa") this
function can be used to apply the learned function to the
input data.
The execution is completed in 4 steps:
1. projection on the input principal components
(dimensionality reduction)
2. expansion (if
necessary)
3. projection on the whitened (expanded)
space
4. projection on the slow functions