Amplitudes of variation of quasars detected by the CNN from the u-band filteragainst those from the r-band filter at three different recalls: 0.90, 0.95, and 0.97. The black crosses represent all the known quasars during the testing phase. The red crosses are the 175 new quasar candidates. The dashed lines represent the line y = x. The quasars show larger variation amplitudes in bluer-bands. This tendency highlights a strong wavelength dependence.