fix rpc tutorial (#818)

tutorials/deployment/cross_compilation_and_rpc.py

@@ -102,6 +102,12 @@ for example.
 # same machine, for demonstration. This line can be omitted if we
 # started an remote server.
 #
+from __future__ import absolute_import, print_function
+
+import tvm
+import numpy as np
+from tvm.contrib import rpc, util
+
 server = rpc.Server(host='0.0.0.0', port=9090, use_popen=True)
 
 ######################################################################
@@ -114,12 +120,6 @@ server = rpc.Server(host='0.0.0.0', port=9090, use_popen=True)
 #
 # Here we will declare a simple kernel with TVM on the local machine:
 
-from __future__ import absolute_import, print_function
-
-import tvm
-import numpy as np
-from tvm.contrib import rpc, util
-
 n = tvm.convert(1024)
 A = tvm.placeholder((n,), name='A')
 B = tvm.compute(A.shape, lambda *i: A(*i) + 1.0, name='B')