# OnCo record data-leakage (term). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)". Whole corpus: https://onco.cc/api/v1/onco.nt
@prefix schema: <https://schema.org/> .
@prefix onco: <https://onco.cc/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://onco.cc/terms/data-leakage/>
  a schema:DefinedTerm ;
  onco:kind "term" ;
  schema:identifier "data-leakage" ;
  schema:name "Data leakage in model evaluation"@en ;
  schema:alternateName "data leakage"@en, "leakage"@en, "train-test leakage"@en, "cross-validation leakage"@en, "leaky preprocessing"@en, "fit on train fold only"@en, "benchmark contamination"@en, "test set contamination"@en ;
  schema:description "Leakage is when information from the test data reaches the model during training, through a scaler fitted on all samples, a patient split across folds or a benchmark that appeared in the pretraining set, making the model look better than it is."@en ;
  schema:url <https://onco.cc/terms/data-leakage/> ;
  schema:dateModified "2026-09-24"^^xsd:date ;
  schema:sameAs <https://en.wikipedia.org/wiki/Leakage_(machine_learning)> ;
  schema:citation <https://en.wikipedia.org/wiki/Leakage_(machine_learning)> ;
  onco:tag "cansim-terms" ;
  onco:related <https://onco.cc/terms/cancer-ai-vocabulary/> ;
  onco:terms <https://onco.cc/terms/cross-validation/>, <https://onco.cc/terms/train-test-discipline/>, <https://onco.cc/terms/batch-effects/>, <https://onco.cc/terms/leaderboard-benchmark/> .