[misc] fix parser

[hiyouga]

What does this PR do?

Fixes # (issue)

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• Did you write any new necessary tests?

[gemini-code-assist]

Summary of Changes

Hello @hiyouga, 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 focuses on enhancing the robustness and correctness of the argument parsing mechanisms within the project. It introduces safeguards for command-line argument access, refines the process for loading JSON configuration files, and streamlines the argument validation by removing a specific check, ultimately leading to a more stable and reliable configuration handling system.

Highlights

• Improved Argument Parsing Robustness: Added checks to prevent IndexError when accessing command-line arguments (sys.argv), making the parser more resilient to cases where insufficient arguments are provided.
• Refined JSON Configuration Loading: Modified the method for loading JSON configuration files by first using json.load to parse the file content into a Python dictionary, then converting it to an OmegaConf object using OmegaConf.create. This ensures proper handling of JSON structures.
• Removed Argument Validation Logic: The validate_args function, which previously checked for incompatibility between quantization and the DeepSpeed backend, has been removed from the argument parsing flow in arg_parser.py.

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[gemini-code-assist]

Code Review

This pull request aims to fix the argument parser. It correctly adds a boundary check for command-line arguments to prevent an IndexError and removes a validation function. However, the attempt to fix JSON configuration file loading introduces a runtime error by passing a pathlib.Path object to json.load() instead of a file-like object. I have provided a critical review comment with a suggested fix for this issue. A similar issue appears to exist in src/llamafactory/v1/config/arg_parser.py, which was not part of this PR's changes, that you may want to address as well.