What is the method for incomplete trajectories?

[XHwind]

Hi, thanks for sharing your great work~
I am wondering how you deal with the incomplete trajectories problem (agents have less then 2 seconds of history).

1. I notice that for the neighboring agent wrt focal agent, you discard all the agents (code) if their trajectories are not complete
2. how would you deal with those incomplete trajectories for the focal agent? Did you use interpolation or some techniques?

Thanks!