code: def psum(*args, **kwargs):
      """Parallel-sum to use within a pmap'd function for aggregation."""
      return backend()["psum"](*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 35 for calling a global function with example usage: psum() and returns: backend