What percentage could each selected training set be for a 5 fold cross validation especially in face recognition experiment?
Mathematically, the term "fold" is not related to the application.
In a brief, fold means portion or fraction.
You can get the percentage by dividing 100 by the fold.
For example 5-fold=100/5=20.
So each fold contains 20, and 1 fold will be used for validation. so 80% will be used for training and 20% will be used for validation.
Similarly, 10-fold=100/10=10.
So, 90% of data will be used for training and 10% will be used for validation.
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