docstr: Returns the *name* (str) of the currently used backend
  
  Returns
  -------
  name : str
docstr_tok: ["Returns","the","*","name","*","(","str",")","of","the","currently","used","backend","Returns","--","--","--","-","name",":","str"]
code: def get_backend(cls):
      """Returns the *name* (str) of the currently used backend
  
      Returns
      -------
      name : str
      """
      return cls._THREAD_LOCAL_DATA.__dict__.get(
          "backend", cls._backend
      ).backend_name
  
imports: import warnings
  from .core import Backend, backend_array
  import importlib
  import os
  import threading
  from contextlib import contextmanager
  import inspect
  import types
  import sys
label_desc: Use image node_id 4 for calling the BackendManager obj's underlying member method code with example usage: obj.get_backend(cls) and returns: cls