old_contents: """
  Test LpNorm cost
  """
  import numpy
  import theano
  from theano import tensor as T
  from nose.tools import raises
  
  
  def test_shared_variables():
      '''
      LpNorm should handle shared variables.
      '''
      assert False
  
  
  def test_symbolic_expressions_of_shared_variables():
      '''
      LpNorm should handle symbolic expressions of shared variables.
      '''
      assert False
  
  
  @raises(Exception)
  def test_symbolic_variables():
      '''
      LpNorm should not handle symbolic variables
      '''
      assert True
  
  
  if __name__ == '__main__':
      test_shared_variables()
      test_symbolic_expressions_of_shared_variables()
      test_symbolic_variables()
  
new_contents: """
  Test LpNorm cost
  """
  import os
  from nose.tools import raises
  from pylearn2.models.mlp import Linear
  from pylearn2.models.mlp import Softmax
  from pylearn2.models.mlp import MLP
  from pylearn2.costs.cost import LpNorm
  from pylearn2.datasets.cifar10 import CIFAR10
  from pylearn2.training_algorithms.sgd import SGD
  from pylearn2.termination_criteria import EpochCounter
  from pylearn2.train import Train
  
  
  def test_shared_variables():
      '''
      LpNorm should handle shared variables.
      '''
      model = MLP(
          layers=[Linear(dim=100, layer_name='linear', irange=1.0),
                  Softmax(n_classes=10, layer_name='softmax', irange=1.0)],
          batch_size=100,
          nvis=3072
      )
  
      dataset = CIFAR10(which_set='train')
  
      cost = LpNorm(variables=model.get_params(), p=2)
  
      algorithm = SGD(
          learning_rate=0.01,
          cost=cost, batch_size=100,
          monitoring_dataset=dataset,
          termination_criterion=EpochCounter(1)
      )
  
      trainer = Train(
          dataset=dataset,
          model=model,
          algorithm=algorithm
      )
  
      trainer.main_loop()
  
      assert False
  
  
  def test_symbolic_expressions_of_shared_variables():
      '''
      LpNorm should handle symbolic expressions of shared variables.
      '''
      assert False
  
  
  @raises(Exception)
  def test_symbolic_variables():
      '''
      LpNorm should not handle symbolic variables
      '''
      assert True
  
  
  if __name__ == '__main__':
      test_shared_variables()
      test_symbolic_expressions_of_shared_variables()
      test_symbolic_variables()
  
subject: Add more code to LpNorm unit tests