No "contact_frame" in unannotated testset?

[ddshan]

Hi,

Thanks for setting up the benchmark and providing the code for forecasting tasks.

I have a question about the "contact_frame" in the fho_hands_test_unannotated.json file.
The task of Future Hand Prediction aims to predict the hand center locations for the future 5 frames, which are (p3, p2, p1, p, c). But in the fho_hands_test_unannotated.json, there is no "contac_frame" frame number while only having frame number for (p3, p2, p1, p).

However, in Table 35 of the paper, there is the evaluation of "contact_frame" displacement error in testset as below.
I am not clear where I can find the contact_frame in the testset. Could you please me give some guidance or more explanation about it?

Thanks so much in advance!!!