code: def __init__(self):
      self.num_map = 0
      self.num_reduce = 0
      self.map_refs = []
      self.reduce_refs = []
  
imports: import time
  from typing import Any, Callable, Iterable, List, Tuple, Union
  import ray
  from ray import ObjectRef
  from ray.cluster_utils import Cluster
label_desc: Use image node_id 1 to create a new _StatusTracker object  with example: obj = _StatusTracker()