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//load data
var data = DecisionTable.Load("data.txt", FileFormat.CSV);

//create 10-fold 25-repeated cross validation
var cv = new CrossValidation(data, 10, 25);

//create C4.5 decision tree and run cv evaluation
var c45 = new DecisionTreeC45();
var result = cv.Run<DecisionTreeC45>(c45);

//output result
Console.WriteLine("Train Error: {0}", result.Error);