code: def projection_skip(nfm, stride=1):
      mainpath = [
          Conv(**conv_params(3, nfm, stride=stride)),
          Conv(**conv_params(3, nfm, relu=False)),
      ]
      sidepath = [
          SkipNode()
          if stride == 1
          else Conv(**conv_params(1, nfm, stride, relu=False))
      ]
      module = [MergeSum([mainpath, sidepath]), Activation(Rectlin())]
      return module
  
file_path: neon/tests/test_mergesum_layer.py
imports: from builtins import zip
  import numpy
  from neon import NervanaObject
  from neon.layers import Sequential, Conv, MergeSum, SkipNode, Activation
  from neon.initializers.initializer import Gaussian, IdentityInit
  from neon.transforms import Rectlin
  from utils import allclose_with_out
label_desc: Use image node_id 4 for calling a global function with example usage: projection_skip(nfm, stride) and returns: module