diff --git a/pytorch3d/implicitron/models/generic_model.py b/pytorch3d/implicitron/models/generic_model.py
index d4506245..8df1bac4 100644
--- a/pytorch3d/implicitron/models/generic_model.py
+++ b/pytorch3d/implicitron/models/generic_model.py
@@ -532,6 +532,7 @@ class GenericModel(ImplicitronModelBase):  # pyre-ignore: 13
             return None
         loss = sum(losses_weighted)
         assert torch.is_tensor(loss)
+        # pyre-fixme[7]: Expected `Optional[Tensor]` but got `int`.
         return loss
 
     def visualize(
diff --git a/pytorch3d/implicitron/tools/video_writer.py b/pytorch3d/implicitron/tools/video_writer.py
index 7d5edd44..364dabee 100644
--- a/pytorch3d/implicitron/tools/video_writer.py
+++ b/pytorch3d/implicitron/tools/video_writer.py
@@ -84,8 +84,6 @@ class VideoWriter:
                 or a 2-tuple defining the size of the output image.
         """
 
-        # pyre-fixme[6]: For 1st param expected `Union[PathLike[str], str]` but got
-        #  `Optional[str]`.
         outfile = os.path.join(self.cache_dir, self.regexp % self.frame_num)
 
         if isinstance(frame, matplotlib.figure.Figure):
@@ -127,8 +125,6 @@ class VideoWriter:
             video_path: The path to the generated video.
         """
 
-        # pyre-fixme[6]: For 1st param expected `Union[PathLike[str], str]` but got
-        #  `Optional[str]`.
         regexp = os.path.join(self.cache_dir, self.regexp)
 
         if self.output_format == "visdom":  # works for ppt too
diff --git a/pytorch3d/io/obj_io.py b/pytorch3d/io/obj_io.py
index 6d3e7eca..e506325e 100644
--- a/pytorch3d/io/obj_io.py
+++ b/pytorch3d/io/obj_io.py
@@ -215,8 +215,6 @@ def load_obj(
     """
     data_dir = "./"
     if isinstance(f, (str, bytes, Path)):
-        # pyre-fixme[6]: For 1st param expected `PathLike[Variable[AnyStr <: [str,
-        #  bytes]]]` but got `Union[Path, bytes, str]`.
         data_dir = os.path.dirname(f)
     if path_manager is None:
         path_manager = PathManager()