code: def gen_uid(cls, session_id: str, name: str, index: int):
      return f"mutable-tensor-chunk-{session_id}-{name}-{index}"
  
file_path: mars/mars/services/mutable/worker/core.py
imports: import bisect
  from collections import defaultdict
  import sys
  from typing import List, Union
  import numpy
  from ....None import oscar
  from ....typing import ChunkType
label_desc: Use image node_id 2 for calling the MutableTensorChunkActor obj's underlying member method code with example usage: obj.gen_uid(cls, session_id, name, index) and returns: str, session_id, str, name, str, index