code: def from_str(cls, initialization: str) -> "_TokenInitialization":
      try:
          return cls(initialization)
      except ValueError:
          valid_values = [x.value for x in _TokenInitialization]
          raise ValueError(
              f"initialization must be one of {valid_values}"
          )
  
imports: import enum
  import math
  import warnings
  from typing import Callable, Dict, List, Optional, Tuple, Union, cast
  import torch
  import torch.nn.functional
  from torch import Tensor, nn
  from .utils import init_weights
label_desc: Use image node_id 1 for calling the _TokenInitialization obj's underlying member method code with example usage: obj.from_str(cls, initialization) and returns: cls