Update rec example

[yanxi-chen]

Description

Revise documentation of rec_gsm8k example, and remove rec_math example since it's mostly repetitive.

Checklist

Please check the following items before code is ready to be reviewed.

• Code has passed all tests
• Docstrings have been added/updated in Google Style
• Documentation has been updated
• Code is ready for review

[gemini-code-assist]

Summary of Changes

Hello @yanxi-chen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the example documentation and structure within the repository. It primarily focuses on enhancing the clarity and accuracy of the rec_gsm8k example's documentation, providing more precise descriptions of the various group-relative REINFORCE algorithms and their underlying principles, and adding a relevant academic citation. Concurrently, a redundant rec_math example has been removed to reduce duplication and maintain a cleaner codebase. A minor configuration adjustment was also made in the gsm8k.yaml file.

Highlights

• Documentation Update: The rec_gsm8k example's README.md has been significantly revised to provide clearer descriptions of group-relative REINFORCE variants and their families (REC, REP, RED), along with an academic citation.
• Example Removal: The rec_math example, including its README.md and math.yaml configuration, has been removed due to its repetitive nature.
• Configuration Adjustment: The gsm8k.yaml configuration file was updated to set the default clip_mode to "one-side" instead of "none".

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the rec_gsm8k example and removes the now-redundant rec_math example. The changes significantly improve the clarity and structure of the documentation by providing more detailed descriptions of the algorithm families and consistent formatting for the configuration examples. I've left a few minor suggestions to further improve the consistency of the markdown formatting. Overall, this is a great cleanup and documentation improvement.