[ST][MS/modelzoo][NET][resnext50][GPU]loss become too large

| name       | about	                             | labels   |
| ---------- | ------------------------------------- | -------- |
| Bug Report | Use this template for reporting a bug | kind/bug |

### Describe the current behavior / 问题描述 (Mandatory / 必填)
loss跑飞了（偶现）
 问题commitid：a0ecf8bf
ok_commit_id:3232a15b (20220513181541)
### Environment / 环境信息 (Mandatory / 必填)
- **Hardware Environment(`Ascend`/`GPU`/`CPU`)  / 硬件环境**: 
> Please delete the backend not involved / 请删除不涉及的后端:
> /device Ascend/

- **Software Environment / 软件环境 (Mandatory / 必填)**:
-- MindSpore version (e.g., 1.7.0.Bxxx) :master commit_id:
-- Python version (e.g., Python 3.7.5) :
-- OS platform and distribution (e.g., Linux Ubuntu 16.04):
-- GCC/Compiler version (if compiled from source):

- **Excute Mode / 执行模式 (Mandatory / 必填)(`PyNative`/`Graph`)**: 
> Please delete the mode not involved / 请删除不涉及的模式:
> /mode graph

### Related testcase / 关联用例 (Mandatory / 必填)
test_ms_resnext50_check_loss_8p
### Steps to reproduce the issue / 重现步骤 (Mandatory / 必填)
1. get code from models
2. sh run_train.sh
3.

### Describe the expected behavior / 预期结果 (Mandatory / 必填)
训练成功,LOSS收敛至标准下
### Related log / screenshot / 日志 / 截图 (Mandatory / 必填)
![输入图片说明](https://images.gitee.com/uploads/images/2022/0712/095215_05fe0b9b_9369301.png "rexnext50.png")
 
### Special notes for this issue/备注 (Optional / 选填)
备注 提给安正气

GVP MindSpore/mindspore

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GVPMindSpore/mindspore

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