Reorganize the import statements

theano/sandbox/cuda/tests/test_cuda_ndarray.py

 import time, copy, sys, unittest
+# Skip test if cuda_ndarray is not available.
+from nose.plugins.skip import SkipTest
 
+import numpy
 
-from theano.tests import unittest_tools as utt
 import theano
 import theano.sandbox.cuda as cuda_ndarray
-# Skip test if cuda_ndarray is not available.
-from nose.plugins.skip import SkipTest
+from theano.tensor.basic import _allclose
+from theano.tests import unittest_tools as utt
+
 if cuda_ndarray.cuda_available == False:
     raise SkipTest('Optional package cuda disabled')
-import numpy
+
 
 def advantage(cpu_dt, gpu_dt):
     """