What are the large devices called?
The devices are cameras.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of    8
2     0  to the right of    5
3     0  to the right of    4
4     0  to the right of    2
..  ...              ...  ...
66   11  to the right of    3
67   12   to the left of    0
68   12   to the left of   10
69   12   to the left of    3
70   12  to the right of    7

[71 rows x 3 columns]