code: def use_key(self, key):
      self._keys_in_use[key] += 1
      try:
          yield
      finally:
          self._keys_in_use[key] -= 1
  
file_path: horovod/horovod/spark/common/cache.py
imports: import collections
  import contextlib
  import threading
label_desc: Use image node_id 3 for calling the TrainingDataCache obj's underlying member method code with example usage: obj.use_key(key) without return types