code: def clear(self) -> None:
      raise NotImplementedError(
          "Subclass of InstrumentStorage must implement `clear` method"
      )
  
imports: import re
  from typing import Iterable, overload, Tuple, List, Text, Union, Dict
  import numpy
  import pandas
  from qlib.log import get_module_logger
label_desc: Use image node_id 3 for calling the InstrumentStorage obj's underlying member method code with example usage: obj.clear() without return types