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this is to create cross validation folds as :
user provide a csv file and the desired number of folds, lets say 3
input: (filename, 3)
assume the file has a n records
1) randomly divide the data into 3 files where each file has n/3 records
call them file 1 , file 2 and file 3
2) combine 2 of the 3 and call them training set and the last one will be testing set
do this for again and again where each time 2 files are combined and 1 left as training.
so for 3 folds, the output will be 6 files
training set 1 (file 1 and 2 combined), testing set 1 (file 3)
training set 2 (file 1 and 3 combined), testing set 2 (file 2)
training set 3 (file 2 and 3 combined), testing set 3 (file 1)
same procedure for number of folds =5, 7, or 10
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