docstr: Number of optimization steps taken so far
docstr_tok: ["Number","of","optimization","steps","taken","so","far"]
code: def __len__(self) -> int:
      """
      Number of optimization steps taken so far
      """
      pass
  
file_path: opacus/opacus/accountants/accountant.py
imports: import abc
  from collections import OrderedDict
  from copy import deepcopy
  from typing import Any, Callable, Mapping, TypeVar
  from opacus.optimizers import DPOptimizer
label_desc: Use image node_id 4 for calling the IAccountant obj's underlying member method code with example usage: obj.__len__() without return types