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skrunch

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PyTorch offers a way to export to ONNX but you will encounter various errors. [1]

I mean sure, there are limitations, but this is greatly exaggerating their impact in my experience. I'd be curious to hear from anyone where these have been serious blockers, I've been exporting PyTorch models to ONNX (for CV applications) for the last couple of years without any major issues (and any issues that did pop up were resolved in a matter of hours).

Traffic Simulator 6 years ago

This doesn't exactly answer your question, but what I settled on during my dissertation (granted, that was a few years ago now) was SUMO: https://www.eclipse.org/sumo/

IIRC you could import maps from from open street map, but I'm not sure if it has a "headless" mode, without all the visualisation.

The visualisation linked to at the end goes into some more detail and was definitely worth the extra 5 minute read for me!