code: def mangle_module_name(mod_name):
      if not _is_valid_modname(mod_name):
          raise ValueError(mod_name + " contains invalid characters")
      if mod_name:
          return "tvmgen_" + mod_name
      return "tvmgen"
  
imports: from enum import Enum
label_desc: Use image node_id 2 for calling a global function with example usage: mangle_module_name(mod_name) and returns: str, unknown