[Bugfix] fix float32 to int8 · Pull Request !88369 · MindSpore/mindspore

1. fix float32 to int8
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**What type of PR is this?**

/kind bug

**What does this PR do / why do we need it**:
Dryrun level3训练加载权重时，有float32转int8场景，该数据类型转换在框架中未定义导致报错退出
fix solution: 添加float32到int8的映射，使框架支持该数据类型转换

**Which issue(s) this PR fixes**:

Fixes #ICSCW7

**Code review checklist [【代码检视checklist说明】](https://gitee.com/mindspore/community/blob/master/security/code_review_checklist_mechanism.md)**:

+ - [ ] 是否进行返回值校验 (禁止使用void屏蔽安全函数、自研函数返回值，C++标准库函数确认无问题可以屏蔽)
+ - [ ] 是否遵守 ***SOLID原则 / 迪米特法则***
+ - [ ] 是否具备UT测试用例看护 && 测试用例为有效用例 (若新特性无测试用例看护请说明原因)
+ - [ ] 是否为对外接口变更
+ - [ ] 是否涉及官网文档修改

类型	指派人员	状态
审查	ZPaC miaoyanming guozhijian kingxian liujunzhu suteng baochong liangchenghui anyrenwei chengbin zichun_ye jjfeing YuJianfeng yangzhenzhang guoqi kisnwang yao_yf chujinjin limingqi107 changzherui hangq 张学同 Gaoxiong BJ-WANG zhangqinghua zlq2020 Erpim jiahongqian Yi_zhang95 xiaosh	进行中 (0/1人)
测试	Richard_mei Chopin_syp duanjiali leiwei2 linzhengshu	已完成 (0/0人)

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