Fix Error in calculating mean std dev of results

[venkatesh-kulkarni]

Change the calculation of mean and std dev of results from

results_mean = list(results.mean().values)
results_std = list(results.std().values)

TO

# Exclude non-numeric columns before calculating mean and std
numeric_results = results.select_dtypes(include=['number'])

results_mean = list(numeric_results.mean().values)
results_std = list(numeric_results.std().values)

in the function kfold_cv_with_classifier