class_docstr: Context manager for making an algorithm instance available to catalyst API
  functions within a scoped block.
docstr: Restore the algo instance stored in __enter__.
code: def __exit__(self, _type, _value, _tb):
      """
      Restore the algo instance stored in __enter__.
      """
      set_algo_instance(self.old_algo_instance)
  
file_path: catalyst/catalyst/utils/api_support.py
imports: from functools import wraps
  import catalyst.api
  from catalyst.utils.algo_instance import get_algo_instance, set_algo_instance
label_desc: Use image node_id 3 for calling the ZiplineAPI obj's underlying member method code with example usage: obj.__exit__(_type, _value, _tb) without return types