To quote:

The goal of this exercise is to go through a semi-realistic data science
and machine learning task and develop a practical solution for it. We
will learn about the following topics:

- Perform *exploratory data analysis*
- Do some non-trivial *feature engineering*
- Explain how the feature engineering informs the *choice of machine
  learning model* and vice versa
- Show how to make use of a couple of *advanced scikit-learn* features
  and explain why we use them - Create a *model card* that provides
  useful information about the model
- Share the model by uploading it to the *Hugging Face Hub*

Previously, it was annotated as only taking str.