text problem formulation是什么，什么时候用到

问题如下：

The Dataset 2 collection process is most likely part of which Text ML Model-Building Step:

选项：

A.data (text) curation. B.text problem formulation. C.text preparation and wrangling.

解释：

Solution

A is correct. The process of gathering relevant external text data via web services or web-spidering (scraping or crawling) programs that extract raw content from a source is known as data (text) curation, which is Step 2 of the Text ML Model-Building Steps.

B is incorrect. Text problem formulation, which is Step 1 of the Text ML Model-Building Steps, is the process of determining how to formulate the text classification problem and identifying the exact inputs and outputs for the model.

C is incorrect. Text preparation and wrangling, which is Step 3 of the Text ML Model-Building Steps, are the cleansing and preprocessing tasks necessary to convert streams of unstructured data into a format that is usable by traditional modeling methods designed for structured inputs.