9. The computing device of claim 1 , wherein the data assigned to the first node indicates that the first node corresponds to a first trajectory and a second trajectory, the first trajectory comprising locations of the first object during a first window of time in the window of time, the second trajectory comprising locations of the first object during a second window of time in the window of time.
9. The computing device of claim 1 , wherein the data assigned to the first node indicates that the first node corresponds to a first trajectory and a second trajectory, the first trajectory comprising locations of the first object during a first window of time in the window of time, the second trajectory comprising locations of the first object during a second window of time in the window of time. 10. The computing device of claim 9 , wherein the symmetric relationship between objects in the scene is a distance between the objects in the scene.