The MPC Trade-off Nobody Wants to Talk About (But Should)
Two new papers tackle the same old problem I've been griping about since my Kuka days: you can have accurate robot control or fast robot control, but getting both is still a pain.
Image credit: Lottie animation by Centre Robotics (LottieFiles Free, used with credit). · source
Look, here's the thing. When I was at Kuka, we used to joke that Model Predictive Control was like a brilliant colleague who needed three coffee breaks for every decision. Accurate? Absolutely. Fast enough for the real world? That was always the question.
Two papers crossed my desk this week that suggest the academic world is finally catching up to what us industry folks have been muttering about for years. And I'll be honest, one of them actually impressed me.
The first paper, out of what appears to be a university robotics lab, introduces something called Adaptive Dynamics Orchestration, or ADO. The basic idea isn't new (we were doing crude versions of this with the KR C4 controllers back in 2015), but the execution is clever. Instead of picking one dynamics model and living with its limitations, ADO maintains a whole library of models with different accuracy and speed profiles. The system then picks the right tool for the job in real time.
What caught my attention was the counterfactual rollout bit. The system basically replays what actually happened through all its models to see which one would have predicted reality best. It's learning from its own mistakes without waiting for a catastrophic failure to teach it. I called my old colleague at Siemens about this, and he pointed out that industrial arms have been doing something vaguely similar with adaptive feedforward control for years. But applying it to off-road navigation where the terrain is constantly changing? That's genuinely harder.
The results look promising, though the paper is light on details about computational overhead. They claim it approaches high-fidelity accuracy without the latency hit, but I'd want to see this running on actual industrial hardware before I got too excited. Lab robots and production floor robots are, well, different beasts.
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