code: def expit(*args, **kwargs):
      """Computes the expit (sigmoid) function."""
      return backend()["expit"](*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 2 for calling a global function with example usage: expit() and returns: backend