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使用tf-idf, TextRank4ZH等不同方式从中文文本中提取关键字,从中文文本中提取摘要和关键词

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get_idf.py第35行: `total =+1`应修改为`total+=1` 导致计算idf时的文档总数为1,idf全为负

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa1 in position 1: invalid start byte