docstr: Split the dataset in a certain proportion
  :param test_size: the proportion of test set
  :return:
docstr_tok: ["Split","the","dataset","in","a","certain","proportion",":","param","test_size",":","the","proportion","of","test","set",":","return",":"]
code: def split_dataset(self, test_size=0.1):
      """
      Split the dataset in a certain proportion
      :param test_size: the proportion of test set
      :return:
      """
      (
          self.X_train,
          self.X_test,
          self.y_train,
          self.y_test,
      ) = train_test_split(
          self.X_train, self.X_test, test_size=test_size
      )
  
imports: from sklearn.model_selection import train_test_split
  import utils.data_utils
label_desc: Use image node_id 2 for calling the Dataset obj's underlying member method code with example usage: obj.split_dataset(test_size) without return types