I think we're probably thinking of the same papers. There was a competition /session at last year's neurips and there's related papers linked from their webpage

I think we're probably thinking of the same papers. There was a competition /session at last year's neurips and there's related papers linked from their webpage. https://www.ecole.ai/2021/ml4co-competition/ https://www.ecole.ai/2021/ml4co-competition/