An unexpected detour into partially symbolic, sparsity-expoiting autodiff; or Lord won’t you buy me a Laplace approximation

Un garçon pas comme les autres (Bayes) - An unexpected detour into partially symbolic, sparsity-expoiting autodiff; or Lord won’t you buy me a Laplace approximation.
Exploiting linearity and sparisty to speed up JAX Hessians and slowly ruin my life.

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