ARTFEED — Contemporary Art Intelligence

Analytic Bridge Diffusions for Controlled Path Generation

other · 2026-05-07

The LQ-GM-PID method is an innovative approach in bridge-diffusion techniques that enables finite-time transport with clear solutions for scores, intermediate marginals, and protocol gradients, eliminating the need for neural networks or internal stochastic simulations. It transforms the classic linear-quadratic-Gaussian (LQG) stochastic-control model into a Path Integral Diffusion (PID) transport problem. In this framework, linear dynamics combined with Gaussian noise and quadratic costs lead to Riccati equations, allowing for optimal feedback in a closed form, where the focus shifts from regulating terminal states to achieving a specified terminal distribution. While it does have some limitations, it offers enough versatility for producing controlled paths.

Key facts

  • Method is called LQ-GM-PID.
  • It is a bridge-diffusion method for finite-time transport.
  • Scores, intermediate marginals, and protocol gradients are available in closed form.
  • No neural networks are needed in the optimization loop.
  • No inner stochastic simulation loops are required.
  • It recasts LQG stochastic control as a PID transport problem.
  • Linear dynamics, Gaussian noise, and quadratic costs are assumed.
  • Terminal state regulation is replaced by a prescribed terminal distribution.

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