Cross validation regarding

#1

i want to know in short more about cross validation… what is cv here??

#2

hi
The goal of cross-validation is to define a data set to test the model in the training phase (i.e. validation data set) in order to limit problems like overfitting,underfitting and get an insight on how the model will generalize to an independent data set.
cv is the size of validation data.
cross validation is used to validate the results we obtained before testing on test data