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小强爱英语 · 2023年06月03日

可以学系统地讲一下这个知识点?

* 问题详情,请 查看题干

NO.PZ202108310100000102

问题如下:

Which of Bector’s statements regarding TF, IDF, and TF–IDF is correct?

选项:

A.

Statement 1

B.

Statement 2

C.

Statement 3

解释:

C is correct.

Statement 3 is correct. TF–IDF values vary by the number of documents in the dataset, and therefore, the model performance can vary when applied to a dataset with just a few documents.

Statement 1 is incorrect because IDF is calculated as the log of the inverse, or reciprocal, of the document frequency measure.

Statement 2 is incorrect because TF at the sentence (not collection) level is multiplied by IDF to calculate TF–IDF.

A is incorrect because Statement 1 is incorrect. IDF is calculated as the log of the inverse, or reciprocal, of the document frequency (DF) measure.

B is incorrect because Statement 2 is incorrect. TF at the sentence (not collection) level is multiplied by IDF to calculate TF–IDF.

这一块知识点好陌生。

1 个答案

星星_品职助教 · 2023年06月03日

同学你好,

这个知识点主要在后面的案例分析里讲,可以听一下视频的这个地方:

对应讲义如下: