fix error: TypeError: Object of type Tensor is not JSON serializable …

[yuanzhoulvpi2017]

…trainer

What does this PR do?

Fixes issue list:

1. https://huggingface.co/google/gemma-7b/discussions/54
2. [https://github.com/[BUG] 训练完模型保存报错 QwenLM/Qwen#1115)(https://github.com/[BUG] 训练完模型保存报错 QwenLM/Qwen#1115)
3. trainer bug leads into log failure #29207

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@muellerzr and @pacman100

[muellerzr]

detach is a bit safer, nice!

[muellerzr]

cc @amyeroberts

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[amyeroberts]

Thanks for fixing!

[echo-valor]

佬，很强