I’ve also run into this same issue using the pre-trained Faster RCNN model from pytorch, saved using
model = torchvision.models.detection.fasterrcnn_resnet50_fpn(pretrained=True)
model.eval()
script_module = torch.jit.script(model)
script_module.save("../models/frcnn_torchscript.pt")

Module.load using the Java wrappers in Android Studio gives:
Unknown builtin op: torchvision::_new_empty_tensor_op.
    Could not find any similar ops to torchvision::_new_empty_tensor_op. This op may not exist or may not be currently supported in TorchScript.

Is this something I could fix by compiling the latest Pytorch Android from source?