code: def flatten(list_in: List) -> List:
      """Flatten a list of (nested lists of) values into a flat list.
  
      Args:
          list_in: list of values, possibly nested
  
      Returns:
          A flat list of values.
      """
      return list(flatten_iterable(list_in))
  
imports: import math
  import os
  from typing import Iterable, List
  import torch.nn
label_desc: Use image node_id 4 for calling a global function with example usage: flatten(list_in) and returns: list