I have a categorical column in Polars with 3 categories 'A', 'B' and 'C', inferred from a training dataset.
Now suppose there exists a previously-unseen category 'X' in my test set. I want to handle it like this:
- Add an
'Unknown'category to the training column - For any unseen categories in test set (e.g.
'X'), set them to'Unknown'.
How to accomplish this?
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