new_contents: 
  from theano import function, config, shared, sandbox
  import theano.tensor as T
  import numpy
  import time
  
  vlen = 10 * 30 * 768  # 10 x #cores x # threads per core
  iters = 1000
  
  rng = numpy.random.RandomState(22)
  x = shared(numpy.asarray(rng.rand(vlen), config.floatX))
  f = function([], T.exp(x))
  print(f.maker.fgraph.toposort())
  t0 = time.time()
  for i in range(iters):
      r = f()
  t1 = time.time()
  print("Looping %d times took %f seconds" % (iters, t1 - t0))
  print("Result is %s" % (r,))
  if numpy.any([isinstance(x.op, T.Elemwise) for x in f.maker.fgraph.toposort()]):
      print('Used the cpu')
  else:
      print('Used the gpu')
  
subject: add gpu test file