code: def neginf(dtype: torch.dtype) -> float:
      """
      Return a representable finite number near -inf for a dtype.
      """
      if dtype is torch.float16:
          return -NEAR_INF_FP16
      else:
          return -NEAR_INF
  
imports: import os
  from typing import Union, Optional, Tuple, Any, List, Sized, TypeVar
  import itertools
  from collections import namedtuple
  import parlai.utils.logging
  import parlai.utils.io
  import torch.optim
label_desc: Use image node_id 1 for calling a global function with example usage: neginf(dtype) and returns: unknown, unknown