Bug in Scaling Focal Length when world_scale is not 1

[alextrevithick]

I believe there may be a bug in the data loader for SRN dataset when world_scale is not 1. Specifically, because focal is given in pixels (for example as 131.25), it should not be scaled by world_scale.

To fix this, just delete line 122 in src/data/SRNDataset.py:

if self.world_scale != 1.0:
    focal *= self.world_scale
    all_poses[:, :3, 3] *= self.world_scale

would become

if self.world_scale != 1.0:
    all_poses[:, :3, 3] *= self.world_scale

Thanks for your great work!