R(2+1)D backbone

[hw-liang]

We noticed in your paper that you got an amazing result with R(2+1)D backbone. Could you public your implementation of R(2+1)D model as well as the best checkpoint? Thanks!

[sjenni]

Hi there,
I added the network definition (see https://github.com/sjenni/temporal-ssl/blob/master/nets/r2plus1d.py).
Checkpoints might follow in the future.