x1      lgb_mape=0.08260 lizy_mape=8.260% huber(d=0.9)=7.121781 huber(d=1.0)=7.865222
x0.01   lgb_mape=0.07320 lizy_mape=8.260% huber(d=0.9)=0.005738 huber(d=1.0)=0.005738
x0.001  lgb_mape=0.00835 lizy_mape=8.260% huber(d=0.9)=0.000057 huber(d=1.0)=0.000057
zero target: lgb_mape = 0.23333333333333336
