Export host_from_gpu and gpu_from_host constructors

theano/sandbox/cuda/__init__.py

@@ -113,6 +113,7 @@ if cuda_available:
             GpuSubtensor, GpuIncSubtensor, GpuFlatten, GpuShape, GpuAlloc,
             GpuJoin,fscalar, fscalar, fvector, fmatrix, frow, fcol, ftensor3, ftensor4
                            , scalar, vector, matrix, row, col, tensor3, tensor4)
+    from basic_ops import host_from_gpu, gpu_from_host
     import opt
     import cuda_ndarray