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They exist and are (nearly all) open-sourced for CPU & Metal (I wrote some of them).

Nice - the "Detectron operators currently do not have CPU implementation; a GPU system is required." on https://github.com/facebookresearch/Detectron/blob/master/IN... is outdated then? Or is it the "nearly all" that's behind this statement?

We have open sourced several operators for detectron so that the model could run on GPU/CPU/mobile (https://github.com/facebookresearch/Detectron/commit/757d77c...). We also open sourced a conversion tool (https://github.com/facebookresearch/Detectron/commit/757d77c...) to help converting the model.