Error relates to adjusting the model_cfg.EXTRA.FOCAL_LENGTH from 5000 to 1000

[Zi-ang-Cao]

Hey authors, Thanks for your excellent job! Based on the discussion here, I tried to change the focal length from 5000 to 1000. As the model_cfg.EXTRA.FOCAL_LENGTH is immutable, I turn to change the source definition of 5000 focal length.

AttributeError: Attempted to set FOCAL_LENGTH to 1000, but CfgNode is immutable

However, after editing two following places, I still can not change the FOCAL_LENGTH from 5000 to 1000.

• Change in the hydra config default.yaml
• Change in init.py

Besides of those two places, I can not find any other place to change the FOCAL_LENGTH. Hence, what's the official way to do so? Will it require re-training from scratch? And in a high-level view, why you choose f=5000 for the demo?

[Zi-ang-Cao]

To be more specific, I am aware of there is a variable in demo.py called scaled_focal_length and that is mutable. But is this a safe manner to do so?

Before calling cam_crop_to_full() with scaled_focal_length, I found that HAMER.forward_step() has already used the OLD self.cfg.EXTRA.FOCAL_LENGTH in line.

Will this two different focal lengths cause inconsistency error?

[linjiangya]

I think you should change it in model_config.yaml in the checkpoints folder, instead of these two places you pointed out because the model_config.yaml will overwrite them anyway when you load the checkpoints.