code: def __call__(cls, *args, **kwargs):
      if cls not in cls._instances:
          cls._instances[cls] = super(SingletonMeta, cls).__call__(
              *args, **kwargs
          )
      return cls._instances[cls]
  
imports: import warnings
  import functools
  from collections import namedtuple, Counter, OrderedDict
  import spacy
  import numpy
label_desc: Use image node_id 1 for calling the SingletonMeta obj's underlying member method code with example usage: obj.__call__(cls) and returns: cls