code: def backend_name():
      """Returns the name of the backend currently in use ('tf' or 'jax')."""
      return backend()["name"]
  
imports: import contextlib
  import enum
  import gin
  from trax.fastmath.jax import JAX_BACKEND
  from trax.fastmath.numpy import NUMPY_BACKEND
  from trax.fastmath.tf import TF_BACKEND
label_desc: Use image node_id 45 for calling a global function with example usage: backend_name() and returns: backend