code: def test_pooling(backend_pair_bench):
      ng, nc = backend_pair_bench
      layer_args = dict(
          dtype=np.float32, N=122, C=16, D=1, H=32, W=32, J=5
      )
      pool_test_args = dict(
          ones=0,
          cpu=1,
          ng=ng,
          nc=nc,
          alpha=1.0,  # not supported in CPU
          ascale=1.2,
          beta=0.0,  # not supported in CPU
          bpower=0.5,
          layer_g=ng.lrn_layer(**layer_args),  # returns a pool layer
          layer_c=nc.lrn_layer(**layer_args),
          **layer_args,
      )
  
      lrn_helper(**pool_test_args)
  
file_path: neon/tests/test_backend_lrn.py
imports: import numpy
  import pytest
  from neon import logger
label_desc: Use image node_id 4 for calling a global function with example usage: test_pooling(backend_pair_bench) without return types