Try to fix docs build

[yuecideng]

Description

Try to fix the docs build for read the docs. However, we may still need to build the docs on internel environment and upload it via github CI

Type of change

• Documentation update

Screenshots

Please attach before and after screenshots of the change if applicable.

Checklist

• I have run the black . command to format the code base.
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Dependencies have been updated, if applicable.