slightly optimistic as a reading of these you know the basis functions learn by sparse coding correspond roughly to phonemes there's a slightly optimistic interpretation I should say and so but if under this slightly optimistic interpretation when say informally that sparse coding has learned to decompose speech data you know very loosely into it because the phonemes to the appearance speech and moreover you can take this recursively apply this idea just as we saw earlier to build higher and higher level features and I guess a few years ago