message: add a shape inference test for group conv
diff: @@ -409,6 +409,14 @@ class TestShapeInference(unittest.TestCase):
  [])
  self._assert_inferred(graph, [make_tensor_value_info('z', TensorProto.FLOAT, (30, 50, 6, 6, 6))])
  + def test_conv_group(self): # type: () -> None
  + graph = self._make_graph(
  + [('x', TensorProto.FLOAT, (30, 4, 8, 8, 8)),
  + ('y', TensorProto.FLOAT, (4, 1, 8, 8, 8))],
  + [make_node('Conv', ['x', 'y'], 'z', group=4)],
  + [])
  + self._assert_inferred(graph, [make_tensor_value_info('z', TensorProto.FLOAT, (30, 4, 1, 1, 1))])
  +
  def test_conv_only_one_pos(self): # type: () -> None
  graph = self._make_graph(
  [('x', TensorProto.FLOAT, (30, 4, 5)),
  