Understanding CatBoost!

CatBoost was developed by Yandex in 2017: CatBoost: unbiased boosting with categorical features. They realized that the boosting process induces a special case of data leakage. To prevent that, they developed two new techniques, the expanding mean target encoding and the ordered boosting.
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[@milleniumsalman1984]

good video

[@nikhilshaganti5585]

Thank you for the video. In the code at 06:20, shouldn't we deduct 1 from cumcount to make sure we are not counting the current row?