Deep neural networks algorithms for stochastic control problems on finite horizon: convergence analysis

Côme Huré (1, 2) , Huyên Pham (1, 2) , Achref Bachouch (3) , Nicolas Langrené (4, 5)

1 LPSM (UMR_8001) - Laboratoire de Probabilités, Statistique et Modélisation
2 UPD7 - Université Paris Diderot - Paris 7
3 UiO - University of Oslo
4 CSIRO - Data61 [Canberra]
5 UIC - BNU HKBU United International College

This paper develops algorithms for high-dimensional stochastic control problems based on deep learning and dynamic programming. Unlike classical approximate dynamic programming approaches, we first approximate the optimal policy by means of neural networks in the spirit of deep reinforcement learning, and then the value function by Monte Carlo regression. This is achieved in the dynamic programming recursion by performance or hybrid iteration and regress-now methods from numerical probabilities. We provide a theoretical justification of these algorithms. Consistency and rate of convergence for the control and value function estimates are analyzed and expressed in terms of the universal approximation error of the neural networks, and of the statistical error when estimating network function, leaving aside the optimization error. Numerical results on various applications are presented in a companion paper [Deep neural networks algorithms for stochastic control problems on finite horizon: numerical applications, Methodol. Comput. Appl. Probab., 24(1) 143-178 2022] and illustrate the performance of the proposed algorithms.

Mots clés: performance iteration; quantization; Deep learning; dynamic programming; regress now; convergence analysis; statistical risk AMS subject classifications. 65C05; 90C39; 93E35

Domaines: Probabilités [math.PR]; Optimisation et contrôle [math.OC]; Machine Learning [stat.ML]

Côme Huré, Huyên Pham, Achref Bachouch, Nicolas Langrené. Deep neural networks algorithms for stochastic control problems on finite horizon: convergence analysis. SIAM Journal on Numerical Analysis, 2021, 59 (1), pp.525-557. ⟨10.1137/20M1316640⟩. ⟨hal-01949213v2⟩