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

tests/test_cameras.py

@@ -39,19 +39,19 @@ import torch
 from common_testing import TestCaseMixin
 from pytorch3d.renderer.camera_utils import join_cameras_as_batch
 from pytorch3d.renderer.cameras import (
+    camera_position_from_spherical_angles,
     CamerasBase,
     FoVOrthographicCameras,
     FoVPerspectiveCameras,
+    get_world_to_view_transform,
+    look_at_rotation,
+    look_at_view_transform,
     OpenGLOrthographicCameras,
     OpenGLPerspectiveCameras,
     OrthographicCameras,
     PerspectiveCameras,
     SfMOrthographicCameras,
     SfMPerspectiveCameras,
-    camera_position_from_spherical_angles,
-    get_world_to_view_transform,
-    look_at_rotation,
-    look_at_view_transform,
 )
 from pytorch3d.transforms import Transform3d
 from pytorch3d.transforms.rotation_conversions import random_rotations