target leakage
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
The inadvertent inclusion of information in the training features that would be unavailable at prediction time, inflating apparent accuracy.
The model looked flawless until we caught the target leakage: a field that only gets populated after the sale closes.
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.
Get words like target leakage on your lock screen, a few a day, with review that makes them stick.
Download on the App Store Lexfall puts a new word on your home and lock screen through widgets, so you learn without opening an app. Free to download. After a free trial, a subscription unlocks every field. Built for iPhone, iOS 15.1 or later.
On a computer?Scan with your iPhone camera.