added alpha scaling in expnorm and visualization function #30
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Hello,
This PR adds the "alpha scaling" described in #28. The parameter is chosen directly from the upper and lower cutoffs only, so it should work with the normal basis function flow that the model initialization currently uses. I also added a utility function,
visualize_basis
that helps visualize gaussian or expnormal bases for debugging purposes. Let me know if there are any changes needed or things to add/remove.