code: def get_backend(request, datatype=np.float32):
      be = gen_backend(
          backend=request.param,
          datatype=datatype,
          device_id=request.config.getoption("--device_id"),
          batch_size=128,
          rng_seed=0,
      )
      if request.param == "gpu":
          be.enable_winograd = (
              2 if be.enable_winograd else be.enable_winograd
          )
      return be
  
imports: import itertools
  import numpy
  import pytest
  import re
  import os
  import sys
  from neon.backends import gen_backend
  from neon.backends.nervanacpu import NervanaCPU
  from neon.layers.container import DeltasTree
label_desc: Use image node_id 4 for calling a global function with example usage: get_backend(request, datatype) and returns: be