overfitting
B2CEFR level
60/100Rarity: rare
TechnicalRegister
The modelling error of fitting noise rather than signal, so a model excels on training data but fails on new data.
The churn model looked flawless in backtesting, but overfitting meant it fell apart on this quarter's live customers.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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