code: def default_uid(cls):
      return cls.__name__
  
file_path: mars/mars/oscar/api.py
imports: from urllib.parse import urlparse
  from typing import Any, Dict, Type, Tuple
  from numbers import Number
  from collections import defaultdict
  from .backend import get_backend
  from .context import get_context
  from .core import _Actor, _StatelessActor, ActorRef
label_desc: Use image node_id 1 for calling the AsyncActorMixin obj's underlying member method code with example usage: obj.default_uid(cls) and returns: cls