sparsity
C2CEFR level
80/100Rarity: very rare
TechnicalRegister
The condition of a dataset containing a high proportion of empty or zero values.
The recommendation model struggled with sparsity, since most users had rated only a handful of items.
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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