Correcting students' multiple-choice answers is a repetitive and mechanical task that can be considered an image multi-classification task. Assuming possible options are 'abcd' and the correct option is one of the four, some students may write incorrect symbols or options that do not exist. In this paper, five classifications were set up - four for possible correct options and one for other incorrect writing. This approach takes into account the possibility of non-standard writing options.

翻译：纠正学生的选择题答案是一项重复且机械的任务，可视为图像多分类任务。假设可能的选项为“abcd”，且正确选项为其中之一，部分学生可能书写错误符号或不存在的选项。本文设置了五类分类——四类对应可能的正确选项，一类对应其他错误书写。该方法考虑到了非标准书写选项的可能性。