code: def _ray_postsubmit(self, task, key, deps, object_ref):
      # Indicate the dask task is submitted.
      self.pb.submit.remote(key, deps, datetime.now())
  
imports: import contextlib
  from collections import namedtuple, defaultdict
  from datetime import datetime
  from dask.callbacks import Callback
label_desc: Use image node_id 2 for calling the ProgressBarCallback obj's underlying member method code with example usage: obj._ray_postsubmit(task, key, deps, object_ref) without return types