code: def persistent_load(self, pid):
      if pid[0] == "exec":
          return self.backend.deserialize_executable(pid[1])
      if pid[0] == "device":
          return self.devices_by_id[pid[1]]
      if pid[0] == "client":
          return self.backend
      raise pickle.UnpicklingError
  
file_path: jax/jax/experimental/serialize_executable.py
imports: from __future__ import annotations
  import pickle
  import io
  from typing import Optional, Union
  import jax
  from jax._src.lib import xla_client
label_desc: Use image node_id 2 for calling the _JaxPjrtUnpickler obj's underlying member method code with example usage: obj.persistent_load(pid) and returns: self, self, self