Fixed norm const for SBVM #3411
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Ports 1899 from NumPyro. We can use the original solution because torch tensors are not immutable.
The SBVM was not correctly normalized for high concentration because the modified Bessel function was not approximated with enough terms.
New
max(501, conc1 + conc2)to decide the number of terms to approximate the Bessel function (i.e.log_I1). This heuristic is checked for concentrations in [1,10_000] and not checked formally.