paper and code issue

[bobfxq]

thanks for your work.I have a confusion: in your paper, you describe performing normalization of the covariance matrix before clustering, but in the code, it seems that clustering is done before normalization.Hope your reply.

[KeKsBoTer]

The renormalization is applied after the cluster step.

Where in the paper does it say that the normalization is performed before the clustering?

[bobfxq]

“Clustering is then performed using the normalized covariance matrices, and each Gaussian stores, in addition to a codebook index, the scalar scaling factor η.”

[KeKsBoTer]

Here normalized refers to the gaussians having a scale vector of length one (scaling factor η is extracted from each matrix). After every clustering step they are re-normalized to make sure the matrices stay normalized.