code: def __getattr__(self, attr):
      return getattr(self._optimizer, attr)
  
file_path: apex/apex/amp/opt.py
imports: import contextlib
  import warnings
  from .scaler import LossScaler, master_params
  from ._amp_state import maybe_print
  import numpy
label_desc: Use image node_id 5 for calling the OptimWrapper obj's underlying member method code with example usage: obj.__getattr__(attr) and returns: getattr