fix: resolve backtest module crash due to Gym and NumPy 2.0+ incompat…

[Lixuyizhi]

Description

This PR upgrades the project from gym to gymnasium to resolve compatibility issues with NumPy 2.0+ and eliminate deprecation warnings. The upgrade maintains full API compatibility by using import gymnasium as gym throughout the codebase.

Key Changes:

• Updated dependency configuration in pyproject.toml and scripts/collect_info.py
• Replaced all from gym import statements with from gymnasium import
• Updated documentation references from gym.Env to gymnasium.Env
• Modified RL modules to use gymnasium while maintaining backward compatibility
• All code continues to use gym. prefix for seamless transition

Motivation and Context

• Related Issue: Fixes backtest module crash due to Gym and NumPy 2.0+ incompatibility
• Problem: Gym has been unmaintained since 2022 and does not support NumPy 2.0, causing runtime warnings and potential crashes
• Solution: Migrate to gymnasium, the maintained drop-in replacement that supports modern NumPy versions

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.

Testing Details:

• Verified all import statements work correctly with gymnasium
• Confirmed dependency configuration is properly updated
• Tested that import gymnasium as gym maintains API compatibility
• Validated that all RL modules can be imported without errors

Screenshots of Test Results (if appropriate):

1. Pipeline test: [Add screenshots when available]
2. Your own tests:

Types of changes

• Fix bugs
• Add new feature
• Update documentation

Additional Notes:

• This is a non-breaking change that maintains full backward compatibility
• All existing code using gym. prefix will continue to work unchanged
• The upgrade resolves NumPy 2.0+ compatibility issues
• No functional changes to the RL framework, only dependency updates

---

[Lixuyizhi]

@microsoft-github-policy-service agree