message: Fix lint and improve readibility
diff: @@ -479,7 +479,8 @@ def map_fn(fn,
  elems_value_flat = _elems_value_batchable_to_flat(elems_value_batchable,
  elems_flat_signature)
  elems_value = elems_unflatten(elems_value_flat)
  - autographed_fn = autograph.tf_convert(fn, autograph_ctx.control_status_ctx())
  + ag_ctx = autograph_ctx.control_status_ctx()
  + autographed_fn = autograph.tf_convert(fn, ag_ctx)
  result_value = autographed_fn(elems_value)
  nest.assert_same_structure(fn_output_signature or elems, result_value)
  result_value_flat = nest.flatten(result_value)
  