[Accuracy diff No.132] Fix accuracy diff for paddle.outer API

[NKNaN]

PR Category

Execute Infrastructure

PR Types

Improvements

Description

排查发现是 matmul kernel 中整数类型在运算时先cast为float32进行计算再cast回整数类型（底层使用的是 blas 等库的接口），大整数相乘会产生溢出，而 Tensor.__multiply__ 可以正确计算，所以在 python 端进行修改。

回测结果：

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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  Files              ?         1           
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  Hits               ?         2           
  Misses             ?         0           
  Partials           ?         0           

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[paddle-ci-bot]

Sorry to inform you that 998403f's CIs have passed for more than 7 days. To prevent PR conflicts, you need to re-run all CIs manually.

[luotao1]

@NKNaN 后续该任务的PR模版都改成：

PR Category
Execute Infrastructure

PR Types
Bug fixes

[NKNaN]

@NKNaN 后续该任务的PR模版都改成：

PR Category
Execute Infrastructure

PR Types
Bug fixes

好的

[luotao1]

@NKNaN 不好意思，上次通知错了，本任务的PR模版为

### PR Category
Operator Mechanism

### PR Types
Bug fixes

cc @ooooo-create @co63oc

[luotao1]

还更新么？

[NKNaN]

还更新么？

不了