How to use applycat for test set?

Intro to Machine Learning (2018)
1

I am trying to make a model for Titanic competition from Kaggle. I have dropped “Name” from both train and test set but it shows an error while prediction saying ValueError: could not convert string to float: 'C'

2

There is a mention of the function apply_cats. And from the help section (using ??) it seems you call it by doing

apply_cats(test_set, train_set)

provided you already have done train_cats on the training set.

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