A season on, ScoutGPT replays every possession he touched in his last year at the club, with someone else in his place.
Modeling Matches as Language: A Generative Transformer Approach for Counterfactual Player Valuation in Football
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The counterfactual runs over Son's last season, and none of that season is in the training data. Train, validation and test also fall in chronological order, so nothing the model saw comes after what it is asked to generate.