points2vols test fix

Summary: Fix tests which depended on output tensors being identical to input ones, which now fail in main PyTorch branch because of some change in autograd. The functions still work in-place.

Reviewed By: patricklabatut

Differential Revision: D34375817

fbshipit-source-id: 295ae195f75eab6c7abab412c997470d8de8add1

tests/test_points_to_volumes.py

@@ -567,8 +567,8 @@ def single_point(self, device, splat: bool, align_corners: bool):
             splat,
         )
 
-        self.assertIs(volume_densities, volume_densities_)
-        self.assertIs(volume_features, volume_features_)
+        self.assertTrue(volume_densities_.is_set_to(volume_densities))
+        self.assertTrue(volume_features_.is_set_to(volume_features))
 
         if align_corners:
             volume_densities_expected[0, 0, 2, 3, 4] = point_weight