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A statistical mechanics framework for Bayesian deep neural networks beyond the infinite-width limit

11 Sep 2022arXiv:2209.04882links table onlyarchive 2025-07-28

R. Pacelli, S. Ariosto, M. Pastore, F. Ginelli, M. Gherardi, P. Rotondo

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Despite the practical success of deep neural networks, a comprehensive theoretical framework that can predict practically relevant scores, such as the test accuracy, from knowledge of the training data is currently lacking. Huge simplifications arise in the infinite-width limit, where the number of units N_ℓ in each hidden layer (ℓ=1,…, L, being L the depth of the network) far exceeds the number P of training examples. This idealisation, however, blatantly departs from the reality of deep learning practice. Here, we use the toolset of statistical mechanics to overcome these limitations and derive an approximate partition function for fully-connected deep neural architectures, which encodes information about the trained models. The computation holds in the ''thermodynamic limit'' where both N_ℓ and P are large and their ratio α_ℓ = P/N_ℓ is finite. This advance allows us to obtain (i) a closed formula for the generalisation error associated to a regression task in a one-hidden layer network with finite α₁; (ii) an approximate expression of the partition function for deep architectures (via an ''effective action'' that depends on a finite number of ''order parameters''); (iii) a link between deep neural networks in the proportional asymptotic limit and Student's t processes.

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