Prevent double SVD computation for selectSVD

[j1c]

Expected Behavior

SVD should be only computed once. When select_dimension is called, we already do an SVD, so no need to do it the second time once the embedding dimension is called.

Actual Behavior

SVD is done twice when using select_dimension

[dfrancisco1998]

I am interested!

[rajpratyush]

@j1c could you explain me this ? especially the embedding dimension section.