Full error analysis of the random deep splitting method for nonlinear parabolic PDEs and PIDEs
This addresses computational challenges in pricing financial derivatives under default risk, representing an incremental improvement over existing deep splitting methods.
The paper tackles solving high-dimensional nonlinear parabolic PDEs and PIDEs with jumps using a randomized extension of the deep splitting method, proving convergence to viscosity solutions and demonstrating it can solve such equations in up to 10,000 dimensions within seconds.
In this paper, we present a randomized extension of the deep splitting algorithm introduced in [Beck, Becker, Cheridito, Jentzen, and Neufeld (2021)] using random neural networks suitable to approximately solve both high-dimensional nonlinear parabolic PDEs and PIDEs with jumps having (possibly) infinite activity. We provide a full error analysis of our so-called random deep splitting method. In particular, we prove that our random deep splitting method converges to the (unique viscosity) solution of the nonlinear PDE or PIDE under consideration. Moreover, we empirically analyze our random deep splitting method by considering several numerical examples including both nonlinear PDEs and nonlinear PIDEs relevant in the context of pricing of financial derivatives under default risk. In particular, we empirically demonstrate in all examples that our random deep splitting method can approximately solve nonlinear PDEs and PIDEs in 10'000 dimensions within seconds.