message: Fix np.load failure in python3 when loading numerical data serialized in python2
diff: @@ -106,7 +106,7 @@ class BackendTest(object):
  prepared_graph = self.backend.prepare(graph)
  for test_data_npz in glob.glob(os.path.join(model_dir, 'test_data_*.npz')):
  - test_data = np.load(test_data_npz)
  + test_data = np.load(test_data_npz, encoding='bytes')
  inputs = list(test_data['inputs'])
  outputs = list(prepared_graph.run(inputs))
  ref_outputs = test_data['outputs']
  