What is the ratio of training and testing instances used in 10-fold cross validation?

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Tikhon Zamotin

It depends on kind of your sport. For canoe sprint testing ratio is 1/5 - 6 wk

Chinedu Pascal Ezenkwu

K-fold cross-validation is done with 1/kth of your dataset as the test set while the rest is used for training but iterate through each k different dataset and average the classifier's errors. So your 90% for training and 10% for testing is correct.