Fake "correct" strides to satisfy the cudnn functions.

theano/sandbox/cuda/dnn.py

@@ -206,10 +206,10 @@ CudaNdarray_HOST_DIMS(%(var)s)[0],
 CudaNdarray_HOST_DIMS(%(var)s)[1],
 CudaNdarray_HOST_DIMS(%(var)s)[2],
 CudaNdarray_HOST_DIMS(%(var)s)[3],
-CudaNdarray_HOST_STRIDES(%(var)s)[0],
-CudaNdarray_HOST_STRIDES(%(var)s)[1],
-CudaNdarray_HOST_STRIDES(%(var)s)[2],
-CudaNdarray_HOST_STRIDES(%(var)s)[3]
+CudaNdarray_HOST_STRIDES(%(var)s)[0]?CudaNdarray_HOST_STRIDES(%(var)s)[0]:CudaNdarray_HOST_DIMS(%(var)s)[2]*CudaNdarray_HOST_DIMS(%(var)s)[3]*CudaNdarray_HOST_DIMS(%(var)s)[1],
+CudaNdarray_HOST_STRIDES(%(var)s)[1]?CudaNdarray_HOST_STRIDES(%(var)s)[1]:CudaNdarray_HOST_DIMS(%(var)s)[2]*CudaNdarray_HOST_DIMS(%(var)s)[3],
+CudaNdarray_HOST_STRIDES(%(var)s)[2]?CudaNdarray_HOST_STRIDES(%(var)s)[2]:CudaNdarray_HOST_DIMS(%(var)s)[3],
+CudaNdarray_HOST_STRIDES(%(var)s)[3]?CudaNdarray_HOST_STRIDES(%(var)s)[3]:1
 );
 if (%(err)s != CUDNN_STATUS_SUCCESS) {
   PyErr_Format(PyExc_RuntimeError, "could not set tensor4d descriptor: %%s",