\begin{algorithm}
\caption{Imprecise Bayesian Neural Network}\label{alg:ibnn}
\begin{algorithmic}
\item 
\textbf{S1} Specify a \textit{finite} set $\mathcal{P}$ of plausible prior probabilities on the parameters $\theta$ of the neural network, and a \textit{finite} set $\mathcal{L}_{x,\theta}$ of plausible likelihoods. 
\item 
\textbf{S2} Compute posterior $P_D=\mathsf{post}(P,P_{x,\theta})$, for all $P\in\mathcal{P}$ and all $P_{x,\theta}\in\mathcal{L}_{x,\theta}$.
\end{algorithmic}
\end{algorithm}

\begin{algorithm}
\caption{Imprecise Bayesian Neural Network}\begin{algorithmic}
\item
\textbf{S1} Specify a \textit{finite} set $\mathcal{P}$ of plausible prior probabilities on the parameters $\theta$ of the neural network, and a \textit{finite} set $\mathcal{L}_{x,\theta}$ of plausible likelihoods.
\item
\textbf{S2} Compute posterior $P_D=\mathsf{post}(P,P_{x,\theta})$, for all $P\in\mathcal{P}$ and all $P_{x,\theta}\in\mathcal{L}_{x,\theta}$.
\end{algorithmic}
\end{algorithm}
{
    "title": "credal bayesian deep learning",
    "id": "2302.09656",
    "abstract": "uncertainty quantification and robustness to distribution shifts are important goals in machine learning and artificial intelligence. although bayesian neural networks (bnns) allow for uncertainty in the predictions to be assessed, different sources of uncertainty are indistinguishable. we present credal bayesian deep learning (cbdl). heuristically, cbdl allows to train an (uncountably) infinite ensemble of bnns, using only finitely many elements. this is possible thanks to prior and likelihood finitely generated credal sets (fgcss), a concept from the imprecise probability literature. intuitively, convex combinations of a finite collection of prior-likelihood pairs are able to represent infinitely many such pairs. after training, cbdl outputs a set of posteriors on the parameters of the neural network. at inference time, such posterior set is used to derive a set of predictive distributions that is in turn utilized to distinguish between aleatoric and epistemic uncertainties, and to quantify them. the predictive set also produces either (i) a collection of outputs enjoying desirable probabilistic guarantees, or (ii) the single output that is deemed the best, that is, the one having the highest predictive lower probability -- another imprecise-probabilistic concept. cbdl is more robust than single bnns to prior and likelihood misspecification, and to distribution shift. we show that cbdl is better at quantifying and disentangling different types of uncertainties than single bnns, ensemble of bnns, and bayesian model averaging. in addition, we apply cbdl to two case studies to demonstrate its downstream tasks capabilities: one, for motion prediction in autonomous driving scenarios, and two, to model blood glucose and insulin dynamics for artificial pancreas control. we show that cbdl performs better when compared to an ensemble of bnns baseline.",
    "categories": "cs.lg stat.ml",
    "doi": "",
    "created": "2023-02-19",
    "updated": "2024-02-22",
    "authors": [
        "michele caprio",
        "souradeep dutta",
        "kuk jin jang",
        "vivian lin",
        "radoslav ivanov",
        "oleg sokolsky",
        "insup lee"
    ],
    "affiliation": [],
    "url": "https://arxiv.org/abs/2302.09656"
}
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