Bug fix in load_plugins and explorer

[chenyushuo]

Description

As the title says.

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 @chenyushuo, 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 addresses several issues related to plugin loading and environment variable propagation within the Trinity framework, particularly concerning its interaction with Ray. It centralizes the plugin loading mechanism, enhances the handling of multiple plugin directories, and ensures that necessary environment variables are correctly passed to Ray's runtime environment, along with a specific bug fix in the explorer module.

Highlights

• Centralized Plugin Loading: The load_plugins() function is now called directly from trinity/__init__.py, ensuring that all plugins are loaded automatically upon package import, simplifying the startup process and removing redundant calls.
• Improved Plugin Directory Management: The load_plugins utility has been refactored to support loading plugins from multiple specified directories, including those defined in the PLUGIN_DIRS environment variable, and includes logic to prevent redundant loading of already processed directories.
• Enhanced Ray Environment Propagation: Environment variables, including those related to plugin directories, are now properly captured and passed to Ray's runtime_env during ray.init() and setup_ray_cluster calls, ensuring that distributed Ray actors have access to the correct environment for plugin discovery.
• Explorer Module Bug Fix: A conditional check (self.config.mode != "bench") was added to the Explorer initialization to prevent an assertion error related to the experience buffer when collect_experiences is enabled in "bench" mode, ensuring correct behavior in different operational configurations.

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[gemini-code-assist]

Code Review

This pull request refactors the plugin loading mechanism by moving it to the package's __init__.py, ensuring plugins are loaded on import. It also updates Ray worker configurations to inherit environment variables, which is a good improvement for propagating settings like PLUGIN_DIRS. However, I've found a critical bug in trinity/cli/launcher.py that can cause a TypeError when constructing the PLUGIN_DIRS environment variable. I've also identified an incorrect type hint in trinity/utils/plugin_loader.py that could lead to unexpected behavior. My review includes specific code suggestions to address these issues.

[chenyushuo]

/unittest-module-utils

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
4	4	0	0	0	0	7ms

Tests

Test Name	Status	Flaky	Duration
tests/utils/eval_utils_test.py::TestMathEvalUtils::test_extract_answer	✅		1ms
tests/utils/eval_utils_test.py::TestMathEvalUtils::test_verify_math_answer	✅		1ms
tests/utils/eval_utils_test.py::TestEvalUtils::test_is_equiv	✅		1ms
tests/utils/plugin_test.py::TestPluginLoader::test_load_plugins	✅		4ms

Github Test Reporter by CTRF 💚

[pan-x-c]

LGTM

[pan-x-c]

/unittest-module-trainer