code: def _ray_posttask(self, key, result, pre_state):
      # Executed at the end of the Ray task.
      execution_time = timer() - pre_state
      print(f"Execution time for task {key}: {execution_time}s")
  
imports: import ray
  import dask.array
  from ray.util.dask import RayDaskCallback, ray_dask_get
  from timeit import default_timer
label_desc: Use image node_id 2 for calling the MyTimerCallback obj's underlying member method code with example usage: obj._ray_posttask(key, result, pre_state) without return types