code: def abstract_eval(*args, **kwargs):
      """Evaluates function just on signatures of parameters, return signatures."""
      return backend()["abstract_eval"](*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 36 for calling a global function with example usage: abstract_eval() and returns: backend