Fix: json load issue fix by prompt engineering

[shijie2016]

Description

In some cases, GPT-4o outputs text with a '‘’json prefix or similar formatting, which makes it impossible for json.load to parse the output correctly. This leads to program crashes when attempting to handle the JSON data.

Motivation and Context

#418

Modified all relevant prompts to ensure that GPT-4o outputs well-formed JSON without unwanted prefixes.
Improved the program's robustness to prevent crashes caused by incorrect output formatting.

How Has This Been Tested?

• Pass the test by running: pytest qlib/tests/test_all_pipeline.py under upper directory of qlib.
• If you are adding a new feature, test on your own test scripts.

Screenshots of Test Results (if appropriate):

1. Pipeline test:
2. Your own tests:

Types of changes

• Fix bugs
• Add new feature
• Update documentation

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📚 Documentation preview 📚: https://RDAgent--419.org.readthedocs.build/en/419/

[shijie2016]

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[shijie2016]

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[TPLin22]

Hi,

Thank you for bringing up this PR. The bug you mentioned might be due to JSON mode not being enabled. Additionally, we've addressed other JSON-related issues in a previous PR 386. Thank you for your contribution!