[Enhance] Confirm the input does not be changed in bg_point_filter unit test (#621)

* add unittest to confirm the input is not be modified

* assert gt_bboxes_3d

* rm .swag

* modify np.allclose to np.equal

* fix error tap

* fix np.equal() error

tests/test_data/test_pipelines/test_augmentations/test_transforms_3d.py

@@ -614,6 +614,7 @@ def test_background_points_filter():
     points = np.concatenate([points, extra_points.numpy()], 0)
     points = LiDARPoints(points, points_dim=4)
     input_dict = dict(points=points, gt_bboxes_3d=gt_bboxes_3d)
+    origin_gt_bboxes_3d = gt_bboxes_3d.clone()
     input_dict = background_points_filter(input_dict)
 
     points = input_dict['points'].tensor.numpy()
@@ -622,7 +623,9 @@ def test_background_points_filter():
                         '[[0.5, 2.0, 0.5]])'
     assert repr_str == expected_repr_str
     assert points.shape == (800, 4)
-    assert np.allclose(orig_points, points)
+    assert np.equal(orig_points, points).all()
+    assert np.equal(input_dict['gt_bboxes_3d'].tensor.numpy(),
+                    origin_gt_bboxes_3d.tensor.numpy()).all()
 
     # test single float config
     BackgroundPointsFilter(0.5)