[bugfix]remove MMMU abcd postprocess, maybe E

[wenba0]

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• Feature（功能新增）
• Bugfix（Bug 修复）
• Docs（文档更新）
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Related Issue | 关联 Issue
Fixes #(issue ID / issue 编号) / Relates to #(issue ID / issue 编号)

🔍 Motivation / 变更动机

gen配置文件中的后处理是多余的，提取了ABCD，可能会有E选项，会导致提取错误

📝 Modification / 修改内容

去除配置文件中的后处理操作

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[gemini-code-assist]

Code Review

This pull request simplifies the mmmu_eval_cfg configuration by removing the pred_postprocessor entry. Feedback identifies that this change leaves an unused import for last_option_postprocess and suggests maintaining a trailing comma in the dictionary definition for better code style and future diff consistency.

[gemini-code-assist]

The removal of pred_postprocessor makes the import of last_option_postprocess on line 5 unused. Please remove the unused import to maintain code cleanliness.

Also, consider keeping the trailing comma in the dictionary definition to follow common Python practices and ensure cleaner diffs for future modifications.

Suggested change

	evaluator=dict(type=MMMUEvaluator)
	evaluator=dict(type=MMMUEvaluator),