about the RMS/RMSE result

[Zouxiaowu]

hi, the stock data would be different while running this code on different date? and the value of prediction should be same single value strangely? what's more, the train score:2.83 MSE(1.68 RMSE) and test score:1.22 MSE(1.10 RMSE) are not just like 0.08MSE(0,29RMSE) and 0.04MSE(0,20RMSE). Thanks a lot.

[EthanSnow]

the value of prediction was single value too. any idea?