code: def get_support_infra(self) -> Set[str]:
      return {"trade_account", "trade_exchange"}
  
imports: from __future__ import annotations
  from abc import abstractmethod
  from typing import Any, Set, Tuple, TYPE_CHECKING, Union
  import numpy
  from qlib.utils.time import epsilon_change
  import warnings
  import pandas
  from ..data.data import Cal
label_desc: Use image node_id 1 for calling the CommonInfrastructure obj's underlying member method code with example usage: obj.get_support_infra() and returns: unknown