new_contents: import nose.tools as nt
  import numpy as np
  import theano
  import theano.tensor as T
  
  import treeano
  import treeano.nodes as tn
  from treeano.sandbox.nodes import mixed_pooling
  
  fX = theano.config.floatX
  
  
  def test_mixed_pool_node_serialization():
      tn.check_serialization(mixed_pooling.MixedPoolNode("a"))
  
  
  def test_gated_pool_2d_node_serialization():
      tn.check_serialization(mixed_pooling.GatedPool2DNode("a"))
  
subject: add mixed pooling tests