Tensor.sub_接口，在910a上，uint8类型，shape为(8,7,5,4)，广播场景下精度不过。

#### 1.Describe the current behavior / 问题描述 (Mandatory / 必填) Tensor.sub_接口，在910a上，uint8类型，shape为(8,7,5,4)，广播场景下精度不过。 #### 2.Environment / 环境信息 (Mandatory / 必填) - **Hardware Environment / 硬件环境(Mandatory / 必填)**: Ascend910A #### 3.Related testcase / 关联用例 (Mandatory / 必填) > - **Testcase Name/ 用例名 (Mandatory / 必填)**: test_t_sub__uint8_4d_8x7x5x4_random_forward_broadcast_1 ``` def test_t_sub__uint8_4d_8x7x5x4_random_forward_broadcast_1(): input_x = Tensor(np.random.randint(100, 255, (8, 7, 5, 4)), mstype.uint8) other = Tensor(np.random.randint(0, 25, (8, 1, 5, 4)), mstype.uint8) alpha = 1 fact = SubMock( attributes={'alpha': alpha}, inputs=[input_x, other]) fact.forward_cmp() ``` > - **Excute Mode / 执行模式 (Mandatory / 必填)**: > -- Excute Mode(e.g., Graph\PyNative): PyNative > -- Excute Mode(e.g., O0\O1\O2)：O* #### 4.Steps to reproduce the issue / 重现步骤 (Mandatory / 必填) > （1）ascend +pynative 执行测试用例 > （2）查看底层调用 #### 5.Describe the expected behavior / 预期结果 (Mandatory / 必填) > **【预期结果】**：精度达标， 底层调用一致 #### 6.Related log / screenshot / 日志 / 截图 (Mandatory / 必填) #### 7.Special notes for this issue/备注 (Optional / 选填) **【定位人】** 阿力