SMC: change scaling computation #3594
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Compute the scaling of the proposal distribution using the same function used by metropolis. This seems to work much more better than the previous function. Just as an example using the "two gaussian model" with n=20.
With the old scaling, the sampler generally get stuck at a single maximum :
with the new scaling, while the solution is not perfect is much more better:
This PR also include some minor refactoring changes not related to the computation of the scaling factor.