message: raise error in case data_type is unrecognized
diff: @@ -65,6 +65,8 @@ def make_tensor(name, data_type, dims, vals, raw=False):
  tensor.int64_data.extend(vals)
  else:
  tensor.int32_data.extend(vals)
  + else:
  + raise RuntimeError('Unrecognized data_type: {}'.format(data_type))
  tensor.dims.extend(dims)
  return tensor
  