src/transformers/utils/fx.py/HFAttribute/node
class HFAttribute:    def node(self):
        # the node for attributes is added lazily, since most will just be method calls
        # which do not rely on the getitem call
        if self._node is None:
            self._node = self.tracer.create_proxy("call_function", builtins.getattr, (self.root, self.attr), {}).node
        return self._node