apply import merging for fbcode/vision/fair (2 of 2)

Summary:
Applies new import merging and sorting from µsort v1.0.

When merging imports, µsort will make a best-effort to move associated
comments to match merged elements, but there are known limitations due to
the diynamic nature of Python and developer tooling. These changes should
not produce any dangerous runtime changes, but may require touch-ups to
satisfy linters and other tooling.

Note that µsort uses case-insensitive, lexicographical sorting, which
results in a different ordering compared to isort. This provides a more
consistent sorting order, matching the case-insensitive order used when
sorting import statements by module name, and ensures that "frog", "FROG",
and "Frog" always sort next to each other.

For details on µsort's sorting and merging semantics, see the user guide:
https://usort.readthedocs.io/en/stable/guide.html#sorting

Reviewed By: bottler

Differential Revision: D35553814

fbshipit-source-id: be49bdb6a4c25264ff8d4db3a601f18736d17be1

projects/nerf/nerf/eval_video_utils.py

@@ -8,7 +8,7 @@ import math
 from typing import Tuple
 
 import torch
-from pytorch3d.renderer import PerspectiveCameras, look_at_view_transform
+from pytorch3d.renderer import look_at_view_transform, PerspectiveCameras
 from torch.utils.data.dataset import Dataset
 
 

projects/nerf/nerf/implicit_function.py

@@ -8,7 +8,7 @@ from typing import Tuple
 
 import torch
 from pytorch3d.common.linear_with_repeat import LinearWithRepeat
-from pytorch3d.renderer import HarmonicEmbedding, RayBundle, ray_bundle_to_ray_points
+from pytorch3d.renderer import HarmonicEmbedding, ray_bundle_to_ray_points, RayBundle
 
 
 def _xavier_init(linear):