Hello, @Kyle_Armstrong
I’m afraid that you won’t be able to use PyTorch backend to run Caffe2 operations on mobile. If you are interested in deploy of Caffe2 models you should build a Caffe2 .pb model files and then run it with Caffe2 backend on mobile, e.g. using speed_benchmark (not speed_benchmark_torch)
To run models using only PyTorch backend your TorchScript model must contain only PyTorch operators and only supported on with mobile PyTorch (e.g. you’re unable to run torchvision::nms op on mobile, at least that was the case recently)