why hardcoded prediction split nuscene data number of frames?

[Zhenghao Peng]

I think here we should use a while loop to back / forward search frames:

[Quanyi Li]

@Alan-LanFeng Not sure if this is done by you..

[Alan]

@QuanyiLi No, didn't touch this part.

[Quanyi Li]

@pengzhenghao It is made by me. If you use while to select all past frames and future frames. The whole scenario will be selected into this scenario description file.