1. A method for training a prediction model for predicting a label to be allocated to a prediction target explanatory variable set, the method comprising: acquiring one or more sets of training data, each of the one or more sets of training data comprising at least one set of explanatory variables and a label allocated to the at least one explanatory variable set; extracting a plurality of explanatory variable subsets from the at least one set of explanatory variables; and training a prediction model utilizing the training data, where the plurality of explanatory variable subsets is reflected on a label predicted by the prediction model to be allocated to a prediction target explanatory variable set with each of the plurality of explanatory variable subsets weighted respectively.