code: def __str__(self) -> str:
      name = self.name if self.name is not None else self.f.__name__
      return f"event: {name} ({self.args}, {self.kwargs})"
  
imports: import functools
  import itertools
  from dataclasses import dataclass
  from typing import Any, Callable, Dict, List, Optional, Tuple, Union
  import torch
  import torch.utils._pytree
label_desc: Use image node_id 2 for calling the ShapeEnvEvent obj's underlying member method code with example usage: obj.__str__() and returns: str, name, str, self, str, self, str