diff --git a/pytorch3d/loss/point_mesh_distance.py b/pytorch3d/loss/point_mesh_distance.py
index 4a263c5a..da4fcb59 100644
--- a/pytorch3d/loss/point_mesh_distance.py
+++ b/pytorch3d/loss/point_mesh_distance.py
@@ -1,5 +1,6 @@
 # Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
 
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 from pytorch3d.structures import Meshes, Pointclouds
 from torch.autograd import Function
diff --git a/pytorch3d/ops/cubify.py b/pytorch3d/ops/cubify.py
index cd82ec97..b2644708 100644
--- a/pytorch3d/ops/cubify.py
+++ b/pytorch3d/ops/cubify.py
@@ -44,6 +44,8 @@ def ravel_index(idx, dims) -> torch.Tensor:
     return linind
 
 
+# pyre-fixme[56]: Decorator `torch.no_grad(...)` could not be called, because its
+#  type `no_grad` is not callable.
 @torch.no_grad()
 def cubify(voxels, thresh, device=None, align: str = "topleft") -> Meshes:
     r"""
diff --git a/pytorch3d/ops/graph_conv.py b/pytorch3d/ops/graph_conv.py
index 796df24c..e9bfa6c5 100644
--- a/pytorch3d/ops/graph_conv.py
+++ b/pytorch3d/ops/graph_conv.py
@@ -3,6 +3,8 @@
 
 import torch
 import torch.nn as nn
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 from torch.autograd import Function
 from torch.autograd.function import once_differentiable
diff --git a/pytorch3d/ops/interp_face_attrs.py b/pytorch3d/ops/interp_face_attrs.py
index 56d04dd7..5d8fe06c 100644
--- a/pytorch3d/ops/interp_face_attrs.py
+++ b/pytorch3d/ops/interp_face_attrs.py
@@ -1,6 +1,8 @@
 # Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
 
 import torch
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 from torch.autograd import Function
 from torch.autograd.function import once_differentiable
diff --git a/pytorch3d/ops/knn.py b/pytorch3d/ops/knn.py
index 8dd9d86a..2bdf3634 100644
--- a/pytorch3d/ops/knn.py
+++ b/pytorch3d/ops/knn.py
@@ -4,6 +4,8 @@ from collections import namedtuple
 from typing import Union
 
 import torch
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 from torch.autograd import Function
 from torch.autograd.function import once_differentiable
diff --git a/pytorch3d/ops/mesh_face_areas_normals.py b/pytorch3d/ops/mesh_face_areas_normals.py
index d58ad0b6..0490e5bb 100644
--- a/pytorch3d/ops/mesh_face_areas_normals.py
+++ b/pytorch3d/ops/mesh_face_areas_normals.py
@@ -1,6 +1,8 @@
 # Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
 
 import torch
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 from torch.autograd import Function
 from torch.autograd.function import once_differentiable
diff --git a/pytorch3d/ops/packed_to_padded.py b/pytorch3d/ops/packed_to_padded.py
index 3e567b53..b3638119 100644
--- a/pytorch3d/ops/packed_to_padded.py
+++ b/pytorch3d/ops/packed_to_padded.py
@@ -1,6 +1,8 @@
 # Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
 
 import torch
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 from torch.autograd import Function
 from torch.autograd.function import once_differentiable
diff --git a/pytorch3d/renderer/blending.py b/pytorch3d/renderer/blending.py
index 1bfa589b..a23937f3 100644
--- a/pytorch3d/renderer/blending.py
+++ b/pytorch3d/renderer/blending.py
@@ -5,6 +5,8 @@ from typing import NamedTuple, Sequence
 
 import numpy as np
 import torch
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 
 
diff --git a/pytorch3d/renderer/compositing.py b/pytorch3d/renderer/compositing.py
index c04da4d6..aec75ebc 100644
--- a/pytorch3d/renderer/compositing.py
+++ b/pytorch3d/renderer/compositing.py
@@ -1,6 +1,8 @@
 # Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
 
 import torch
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 
 
diff --git a/pytorch3d/renderer/mesh/rasterize_meshes.py b/pytorch3d/renderer/mesh/rasterize_meshes.py
index 984d3352..0d81b540 100644
--- a/pytorch3d/renderer/mesh/rasterize_meshes.py
+++ b/pytorch3d/renderer/mesh/rasterize_meshes.py
@@ -5,6 +5,8 @@ from typing import Optional
 
 import numpy as np
 import torch
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 
 
diff --git a/pytorch3d/renderer/points/rasterize_points.py b/pytorch3d/renderer/points/rasterize_points.py
index 1d86dbe8..400ae3c9 100644
--- a/pytorch3d/renderer/points/rasterize_points.py
+++ b/pytorch3d/renderer/points/rasterize_points.py
@@ -3,6 +3,8 @@
 from typing import Optional
 
 import torch
+
+# pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 from pytorch3d import _C
 from pytorch3d.renderer.mesh.rasterize_meshes import pix_to_ndc
 
diff --git a/pytorch3d/structures/meshes.py b/pytorch3d/structures/meshes.py
index 0f0b963a..4746cc9d 100644
--- a/pytorch3d/structures/meshes.py
+++ b/pytorch3d/structures/meshes.py
@@ -1485,7 +1485,6 @@ def join_meshes_as_batch(meshes: List[Meshes], include_textures: bool = True):
         # Meshes objects can be iterated and produce single Meshes. We avoid
         # letting join_meshes_as_batch(mesh1, mesh2) silently do the wrong thing.
         raise ValueError("Wrong first argument to join_meshes_as_batch.")
-    # pyre-fixme[10]: Name `mesh` is used but not defined.
     verts = [v for mesh in meshes for v in mesh.verts_list()]
     faces = [f for mesh in meshes for f in mesh.faces_list()]
     if len(meshes) == 0 or not include_textures: