RuntimeError: ONNX export failed: Couldn't export Python operator SwishImplementation

[IamMRM]

This occurs when I try to export into onnx format. Even with the internet I only get

model.set_swish(memory_efficient=False)

But this doesn't work as it says "torch.nn.modules.module.ModuleAttributeError: 'FC' object has no attribute 'set_swish'"