src/transformers/utils/fx.py/HFProxy/__init__
class HFProxy:    def __init__(self, node: Node, tracer: Optional[Tracer] = None):
        super().__init__(node, tracer=tracer)
        if hasattr(self, "tracer") and self.tracer is not None:
            self.device = self.tracer.root.device
            self.dtype = next(self.tracer.root.parameters()).dtype