About Cross validation

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About Cross validation
I would like to ask if there is any code for the cross validation section, as I use the corresponding dataset and parameter combination for cross validation. However, the optimal parameter combination is not C=6, neutrophil weight is 10, and polynomial kernel function. On the contrary, my code provides C=10, weight is 1, and polynomial kernel function. This has been confusing me for a long time, so I would like to know how the code for the cross validation section you used was written. Thank you very much！