diff --git a/pytorch3d/implicitron/tools/model_io.py b/pytorch3d/implicitron/tools/model_io.py
index c08b86eb..f8410a87 100644
--- a/pytorch3d/implicitron/tools/model_io.py
+++ b/pytorch3d/implicitron/tools/model_io.py
@@ -147,6 +147,7 @@ def find_last_checkpoint(
             # pyre-fixme[61]: `fls` is undefined, or not always defined.
             fl = [f[0 : -len(ext)] + ".pth" for f in fls]
         else:
+            # pyre-fixme[61]: `ext` is undefined, or not always defined.
             fl = fls[-1][0 : -len(ext)] + ".pth"
 
     return fl
diff --git a/pytorch3d/loss/mesh_laplacian_smoothing.py b/pytorch3d/loss/mesh_laplacian_smoothing.py
index 5f4bea23..3ce9298a 100644
--- a/pytorch3d/loss/mesh_laplacian_smoothing.py
+++ b/pytorch3d/loss/mesh_laplacian_smoothing.py
@@ -124,6 +124,7 @@ def mesh_laplacian_smoothing(meshes, method: str = "uniform"):
     if method == "uniform":
         loss = L.mm(verts_packed)
     elif method == "cot":
+        # pyre-fixme[61]: `norm_w` is undefined, or not always defined.
         loss = L.mm(verts_packed) * norm_w - verts_packed
     elif method == "cotcurv":
         # pyre-fixme[61]: `norm_w` may not be initialized here.