diff --git a/pytorch3d/common/__init__.py b/pytorch3d/common/__init__.py
index f34c1017..32b79ce3 100644
--- a/pytorch3d/common/__init__.py
+++ b/pytorch3d/common/__init__.py
@@ -4,6 +4,7 @@
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
 
-from .types import Device, make_device, get_device
+from .types import Device, get_device, make_device
+
 
 __all__ = [k for k in globals().keys() if not k.startswith("_")]
diff --git a/pytorch3d/io/obj_io.py b/pytorch3d/io/obj_io.py
index 16cb9eb1..eaa7563b 100644
--- a/pytorch3d/io/obj_io.py
+++ b/pytorch3d/io/obj_io.py
@@ -10,7 +10,7 @@ import os
 import warnings
 from collections import namedtuple
 from pathlib import Path
-from typing import List, Optional, Union
+from typing import List, Optional
 
 import numpy as np
 import torch
@@ -18,12 +18,7 @@ from iopath.common.file_io import PathManager
 from PIL import Image
 from pytorch3d.common.types import Device
 from pytorch3d.io.mtl_io import load_mtl, make_mesh_texture_atlas
-from pytorch3d.io.utils import (
-    PathOrStr,
-    _check_faces_indices,
-    _make_tensor,
-    _open_file,
-)
+from pytorch3d.io.utils import PathOrStr, _check_faces_indices, _make_tensor, _open_file
 from pytorch3d.renderer import TexturesAtlas, TexturesUV
 from pytorch3d.structures import Meshes, join_meshes_as_batch
 
diff --git a/pytorch3d/io/pluggable_formats.py b/pytorch3d/io/pluggable_formats.py
index 0c52f853..acd0a025 100644
--- a/pytorch3d/io/pluggable_formats.py
+++ b/pytorch3d/io/pluggable_formats.py
@@ -6,7 +6,7 @@
 
 
 import pathlib
-from typing import Optional, Tuple, Union
+from typing import Optional, Tuple
 
 from iopath.common.file_io import PathManager
 from pytorch3d.common.types import Device
diff --git a/pytorch3d/io/ply_io.py b/pytorch3d/io/ply_io.py
index 802d4636..fc8386f8 100644
--- a/pytorch3d/io/ply_io.py
+++ b/pytorch3d/io/ply_io.py
@@ -15,17 +15,12 @@ import sys
 import warnings
 from collections import namedtuple
 from io import BytesIO, TextIOBase
-from typing import List, Optional, Tuple, Union, cast
+from typing import List, Optional, Tuple, cast
 
 import numpy as np
 import torch
 from iopath.common.file_io import PathManager
-from pytorch3d.io.utils import (
-    PathOrStr,
-    _check_faces_indices,
-    _make_tensor,
-    _open_file,
-)
+from pytorch3d.io.utils import PathOrStr, _check_faces_indices, _make_tensor, _open_file
 from pytorch3d.renderer import TexturesVertex
 from pytorch3d.structures import Meshes, Pointclouds
 
diff --git a/pytorch3d/ops/__init__.py b/pytorch3d/ops/__init__.py
index 80aa09a7..22ab32c8 100644
--- a/pytorch3d/ops/__init__.py
+++ b/pytorch3d/ops/__init__.py
@@ -9,7 +9,7 @@ from .cubify import cubify
 from .graph_conv import GraphConv
 from .interp_face_attrs import interpolate_face_attributes
 from .knn import knn_gather, knn_points
-from .laplacian_matrices import laplacian, cot_laplacian, norm_laplacian
+from .laplacian_matrices import cot_laplacian, laplacian, norm_laplacian
 from .mesh_face_areas_normals import mesh_face_areas_normals
 from .mesh_filtering import taubin_smoothing
 from .packed_to_padded import packed_to_padded, padded_to_packed
diff --git a/pytorch3d/ops/laplacian_matrices.py b/pytorch3d/ops/laplacian_matrices.py
index fb898dec..b18e6ca8 100644
--- a/pytorch3d/ops/laplacian_matrices.py
+++ b/pytorch3d/ops/laplacian_matrices.py
@@ -8,6 +8,7 @@ from typing import Tuple
 
 import torch
 
+
 # ------------------------ Laplacian Matrices ------------------------ #
 # This file contains implementations of differentiable laplacian matrices.
 # These include
diff --git a/tests/test_camera_conversions.py b/tests/test_camera_conversions.py
index afc3f04e..0f1c7acc 100644
--- a/tests/test_camera_conversions.py
+++ b/tests/test_camera_conversions.py
@@ -18,6 +18,7 @@ from pytorch3d.utils import (
     opencv_from_cameras_projection,
 )
 
+
 DATA_DIR = get_tests_dir() / "data"
 
 
diff --git a/tests/test_laplacian_matrices.py b/tests/test_laplacian_matrices.py
index 33927d28..f72e1890 100644
--- a/tests/test_laplacian_matrices.py
+++ b/tests/test_laplacian_matrices.py
@@ -8,7 +8,7 @@ import unittest
 
 import torch
 from common_testing import TestCaseMixin, get_random_cuda_device
-from pytorch3d.ops import laplacian, norm_laplacian, cot_laplacian
+from pytorch3d.ops import cot_laplacian, laplacian, norm_laplacian
 from pytorch3d.structures.meshes import Meshes
 
 
@@ -54,7 +54,7 @@ class TestLaplacianMatrices(TestCaseMixin, unittest.TestCase):
         mesh = self.init_mesh()
         verts = mesh.verts_packed()
         faces = mesh.faces_packed()
-        V, F = verts.shape[0], faces.shape[0]
+        V = verts.shape[0]
 
         eps = 1e-12