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• W3136552888 abstract "Abstract We consider the problem of sample degeneracy in Approximate Bayesian Computation. It arises when proposed values of the parameters, once given as input to the generative model, rarely lead to simulations resembling the observed data and are hence discarded. Such “poor” parameter proposals do not contribute at all to the representation of the parameter’s posterior distribution. This leads to a very large number of required simulations and/or a waste of computational resources, as well as to distortions in the computed posterior distribution. To mitigate this problem, we propose an algorithm, referred to as the Large Deviations Weighted Approximate Bayesian Computation algorithm, where, via Sanov’s Theorem, strictly positive weights are computed for all proposed parameters, thus avoiding the rejection step altogether. In order to derive a computable asymptotic approximation from Sanov’s result, we adopt the information theoretic “method of types” formulation of the method of Large Deviations, thus restricting our attention to models for i.i.d. discrete random variables. Finally, we experimentally evaluate our method through a proof-of-concept implementation." @default.
• W3136552888 created "2021-03-29" @default.
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• W3136552888 date "2021-03-22" @default.
• W3136552888 modified "2023-09-27" @default.
• W3136552888 title "Weighted approximate Bayesian computation via Sanov’s theorem" @default.
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• W3136552888 doi "https://doi.org/10.1007/s00180-021-01093-4" @default.
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