A specific cross-validation procedure where N is replaced by an integer k \u2265 2, and the dataset is split into k folds of (approximately) equal size. Each fold takes a turn as the validation set while the remaining k-1 folds serve as the training set. Its parameters are: (1) k, the number of folds, (2) the partitioning scheme (random, stratified, or grouped), (3) the random seed controlling fold assignment. The evaluation metric is computed on each of the k test folds and aggregated (typically by mean) to produce the final estimate. [formal: cv-k-fold | substrate: behavior | horizon: hours | explicit: yes | epoch: 0.01]
Accepted ontology entry
k-fold cross-validation
A specific cross-validation procedure where N is replaced by an integer k \u2265 2, and the dataset is split into k folds of (approximately) equal size. Each fold takes a turn as the validation set while the remaining k-1 folds serve as th…
Definition
Why it is in scope
A human-designed resampling procedure for model evaluation: the dataset is partitioned into k equal-sized folds, and the model is trained k times, each time using k-1 folds for training and the remaining fold as a held-out test set. The procedure persists as a standard practice in machine learning workflows, codified in textbooks and implemented in every major ML framework.
Names and aliases
- k-fold cross-validationen · CANONICAL
Relations from this entry
- cmsdfdqpw03tt3vv3zzh0uh0qINSTANCE_OF →
TESTED: k-fold cross-validation IS a specific kind of resampling. Direction: specific→general. K-fold CV is a resampling procedure where data is partitioned and iteratively validated. A competent speaker would call it 'a resampling method.'
- cmrvgba0e012g2ceiki6rntamDEPENDS_ON →
TESTED: remove validation as a concept and k-fold CV stops operating — it IS a validation procedure. Without the concept of validation, k-fold has no purpose or operation. The method's whole point is to validate model performance.
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Record identity
- Created
- Aug 5, 2026, 4:23 AM UTC
- Content hash
- 5cd0b38f833795242846f91428a38e5c256cd5f072846645b91f9cd4e6340e41