what does scikit learn mean? is scikit teach definite is scikit learn definite what is the covariance matrix of scikit learn what is scikit learning what is scikit learn hmm hmm definition in scikit what is an hmm what does hmm training results what training results in definite non positive covariance matrix what is scikit hmm training results in what is hmm training results in what type of matrix would be non positive definite? what does scikit learn results why is hmm matrix non-definite scikit learn non-definitive covariance matrix which state is negative definite npd? what is a non positive definite covariance matrix how does scikit learn work what is the definite covariance