Fig. 4

Classification of randomly generated data: a Training data. In total, we generated 1100 blue points and 1100 red pints by the same generating function. 100 red points and 100 blue points are chosen randomly as training data, and the left pints are used as test data. b Training data including 100 red points are 100 blue points. c Prediction for the labels of test data. Light blue points are test data predicted as ‘blue’, and yellow points are predicted as ‘red’. Red and blue cross represent training data