Verify the effect of VPL method

To verify the effect of VPL , I had trained two models with arcface loss:
One model with VPL {'start_iters': 20000, 'allowed_delta': 80, 'lambda': 0.15, 'mode': 0, 'momentum': False} , and theaccuracy of it is LFW 99.85, CFP_FP 99.15, AGEDB_30 98.38, IJBC 96.66 (TAR@FAR=0.0001) 99.57(AUC of ROC in IJBC)

And another model without VPL {'start_iters': 20000, 'allowed_delta': 80, 'lambda': 0.15, 'mode': -1, 'momentum': False}, and the accuracy of it is LFW 99.85, CFP_FP 99.10, AGEDB_30 98.43, IJBC 96.79 (TAR@FAR=0.0001) 99.55(AUC of ROC in IJBC)

other settings are same;

The VPL method don't seem to be working...