code: def main_branch():
      return [
          Conv(fshape(7, 64), **commonp3s2),
          Pooling(fshape=3, strides=2, padding=1, op="max"),
          Conv(fshape(3, 192), **commonp1),
          Pooling(fshape=3, strides=2, padding=1, op="max"),
      ]
  
file_path: neon/tests/test_mergebroadcast_layer.py
imports: from builtins import zip
  import numpy
  import pytest
  from neon import NervanaObject, logger
  from neon.layers import Sequential, Conv, Pooling, MergeBroadcast, Affine
  from neon.initializers.initializer import Gaussian, Constant
  from neon.transforms import Rectlin, Softmax
  from neon.layers.container import DeltasTree
  from utils import allclose_with_out
label_desc: Use image node_id 4 for calling a global function with example usage: main_branch() and returns: list