样本数量

20%

30%

40%

50%

spectral kernel, K_s

0.8606

0.8790

0.8981

0.9056

summation kernel,K_sum

0.9047

0.9268

0.9478

0.9508

product kernel, K_product

0.8979

0.9264

0.9439

0.9475

weighted summation kernel, K_weight

0.8985

0.9289

0.9454

0.9480