Basic SparseCFProjection with associated sparse CFs and output, response, and learning function. If sparse component cannot be imported, SparseCFProjection will fall back to a basic dense CFProjection.
CFSOF and CFSLF Plugin function allow any single CF output function to be applied to the sparse CFs, but may suffer a serious performance loss. For real work, such functions should be implemented at the Cython or C++ level.