code: def index_max(*args, **kwargs):
      return backend()["index_max"](*args, **kwargs)
  
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 20 for calling a global function with example usage: index_max() and returns: backend