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N给定具有以下格式的行的输入文件:
N
doc_id, class, text
该class字段只有两个值 [0,1](即两个类)
class
该text字段由一组空格分隔的术语组成。
text
如何使用 R 计算数据集中每个唯一项与每个类之间的互信息。