for instance a question is like " how correlated are the elements of this vector ? " Turns out they are quite correlated , because I mean , especially the neighboring ones , right ? They  they represent the same  almost the same configuration of the vocal tract.
Yeah. Yeah. Mm - hmm.
So there 's a very high correlation. So the classifiers which use the diagonal covariance matrix don't like it. So we 're thinking about de - correlating them.
Hmm.