Code to compute area of coverage from different RL agent

[xinranliang]

Thanks for releasing code and pretrained models from this wonderful project! We really enjoy reading and learning from it.

I wonder if it's possible to release code implementation to compute number of areas explored by agents during RL training stage, one for each environment vectorized in paralleled training. Basically the code to compute curve of Figure 3 in the paper on arxiv:

I looked through current public code base and didn't find them. If there's anything that I miss please do let me know.

Or I'd also appreciate it if you could point out some utils/functions from Habitat API that you use for computing values of this figure. Thank you so much for help!