code: def is_model(model_name):
      """Check if a model name exists"""
      return model_name in _model_entrypoints
  
file_path: generalized-moe/domainbed/registry.py
imports: import sys
  import re
  import fnmatch
  from collections import defaultdict
  from copy import deepcopy
label_desc: Use image node_id 4 for calling a global function with example usage: is_model(model_name) and returns: unknown