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羊 · 2022年06月19日

老师麻烦详细解释一下好吗

NO.PZ2021083101000010

问题如下:

Rivera makes the following statements:

Statement 1 Some of the methods used in the exploration step are different for structured and unstructured data, but for both types of data, the step involves feature selection and feature engineering.

Statement 2 A major difference when developing a text-based ML model is the curation step, which involves cleansing, preprocessing, and converting the data into a structured format usable for model training.

Which of Rivera’s statements about differences in ML model building steps is correct?

选项:

A.

Only Statement 1

B.

Only Statement 2

C.

Both Statement 1 and Statement 2

解释:

A is correct.

Statement 1 is correct because some of the methods used in the fourth step of ML model building (data/text exploration) are different for structured and unstructured data, and for both structured and unstructured data, the exploration step encompasses feature selection and feature engineering.

Statement 2 is incorrect because Rivera described the text preparation and wrangling step, not the text curation step. The data (text) curation step involves gathering relevant external text data via web services or programs that extract raw content from a source.

B and C are incorrect because Statement 2 is incorrect.

考点:Steps in a Data Analysis Project

这道题,不想基础部分拿不到分 谢谢

1 个答案

星星_品职助教 · 2022年06月19日

同学你好,

①对于statement 1,structured data的data exploration step为:

而unstructured data(text data)的data exploration step为:

可以对比发现两者包含的内容有细节不同,但都有feature selection和feature engineering这两个步骤。statement 1的描述是正确的。

②对于statement 2,text data的curation step如下,可以明显看出这个步骤不包含“cleansing, preprocessing”(属于Text preparation and wrangling这个步骤)。statement 2的描述错误。

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