“…After obtaining the raw data set from metabolite measurements, there are various data manipulation steps used in multiclass metabolomic methods, consisting of data filtering, imputation of missing values, data normalization, marker identification, sample separation, classification, and so on. , Among these analytical chains, there are several to dozens of machine learning methods that can be applied in each step. , For instance, the methods of data filtering include the “80% rule”. There are many imputation methods of missing values consisting of KNN ( k -nearest neighbor) and so on.…”