What if I only want to train the human nerf part, what should I do, and how long it would take for training the human part?

[coco]

I tried the humannerf, but I don't know why something went wrong my issue, so I'm trying to use humannerf in ml-neuman to train the only human part, can you tell me what should I do?

[coco]

What are necessary for training command like this:

python train.py --scene_dir ./data/bike  --name=bike_human --load_background=bike_background --train_mode=smpl_and_offset