Tf-idf
(由Tf–idf跳轉過嚟)
Tf-idf（全名 Term Frequency-Inverse Document Frequency）喺資訊提取上泛指一啲反映隻字「喺份文件入面有幾重要」嘅數值。
一隻字嘅 term frequency 係隻字喺份文件入面出現咗幾多次除以份文件嘅總字數。
睇埋
[編輯]文獻
[編輯]- Salton, G., & Buckley, C. (1988). Term-weighting approaches in automatic text retrieval. Information processing & management, 24(5), 513-523.
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