code: def __init__(self):
      raise RuntimeError("Call get_instance() instead")
  
imports: from collections import abc
  from collections import defaultdict
  from copy import deepcopy
  from itertools import chain
  import torch
  import bitsandbytes.functional
label_desc: Use image node_id 1 to create a new GlobalOptimManager object  with example: obj = GlobalOptimManager()