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eaglexps · 2023年04月11日

你好老师

NO.PZ2015120204000039

问题如下:

Schultz and Steele meet to discuss plans for incorporating the sentiment data into a ML model. They discuss the differences in the steps between building ML models that use traditional structured data and building ML models that use textual big data. Steele tells Schultz:

Statement 1 The second step in building text-based ML models is text preparation and wrangling, whereas the second step in building ML models using structured data is data collection.

Statement 2 The fourth step in building both types of models encompasses data/text exploration.

Which of Steele’s statements relating to the steps in building structured databased and text-based ML models is correct?

选项:

A.

Only Statement 1 is correct.

B.

Only Statement 2 is correct.

C.

Statement 1 and Statement 2 are correct

解释:

B is correct. The five steps in building structured data-based ML models are: 1) conceptualization of the modeling task, 2) data collection, 3) data preparation and wrangling, 4) data exploration, and 5) model training. The five steps in building text-based ML models are: 1) text problem formulation, 2) data (text) curation, 3) text preparation and wrangling, 4) text exploration, and 5) model training. Statement 1 is incorrect: Text preparation and wrangling is the third step in building text ML models and occurs after the second data (text) curation step. Statement 2 is correct: The fourth step in building both types of models encompasses data/text exploration.

我想问一下,能不能稍微在讲解下为什么第一个statment不对,因为总感觉没有什么错误。谢谢

1 个答案

星星_品职助教 · 2023年04月11日

同学你好,

建模有固定的顺序,从下图可以看出,对于 text-based ML model(截图下半部分),第二个step确实是 text preparation and wrangling;但对于“ML models using structured data”(截图上半部分),第二个step是data preparation and wrangling,Statement 1提到的Data collection是第一个step。

从一个简单的角度出发,无论是哪种模型,第一步都是收集数据,只不过对于structured model来说这个步骤叫data collection,而对于unstructured model(即text model)来说,这个步骤叫data curation。