Emulators and surrogate models via ML
Shortcuts in scientific simulation using ML
2020-08-11 — 2020-08-26
feature construction
functional analysis
linear algebra
machine learning
networks
neural nets
PDEs
physics
probability
sparser than thou
statistics
statmech
surrogate
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Emulation, a.k.a. surrogate modelling. In this context, it means reducing complicated physics-driven simulations to simpler or faster ones using ML techniques. Especially popular in the ML for physics pipeline. I have mostly done this in the context of surrogate optimisation for experiments. See Neil Lawrence on Emulation for a modern overview.
A recent, hyped paper that exemplifies this approach is Kasim et al. (2020), which (somewhat implicitly) uses arguments from Dropout ensembling to produce quasi-Bayesian emulations of notoriously slow simulations. Does it actually work? And if it does quantify posterior predictive uncertainty well, can it estimate other posterior uncertainties?
Emukit (Paleyes et al. 2019) is a toolkit that generically wraps ML models for emulation purposes.
ML PDEs might be a particularly useful domain.
1 Model order reduction
The traditional, and still useful, approach is reduced order modelling, which has many related tricks.
2 Incoming
3 References
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