diff --git a/projects/implicitron_trainer/impl/optimizer_factory.py b/projects/implicitron_trainer/impl/optimizer_factory.py
index b7691605..acd41e52 100644
--- a/projects/implicitron_trainer/impl/optimizer_factory.py
+++ b/projects/implicitron_trainer/impl/optimizer_factory.py
@@ -123,6 +123,7 @@ class ImplicitronOptimizerFactory(OptimizerFactoryBase):
         """
         # Get the parameters to optimize
         if hasattr(model, "_get_param_groups"):  # use the model function
+            # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
             p_groups = model._get_param_groups(self.lr, wd=self.weight_decay)
         else:
             p_groups = [
diff --git a/projects/implicitron_trainer/impl/training_loop.py b/projects/implicitron_trainer/impl/training_loop.py
index 5bb35ff8..ff15176e 100644
--- a/projects/implicitron_trainer/impl/training_loop.py
+++ b/projects/implicitron_trainer/impl/training_loop.py
@@ -395,6 +395,7 @@ class ImplicitronTrainingLoop(TrainingLoopBase):
             ):
                 prefix = f"e{stats.epoch}_it{stats.it[trainmode]}"
                 if hasattr(model, "visualize"):
+                    # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
                     model.visualize(
                         viz,
                         visdom_env_imgs,
diff --git a/pytorch3d/implicitron/dataset/utils.py b/pytorch3d/implicitron/dataset/utils.py
index f2dc59bb..774efdf5 100644
--- a/pytorch3d/implicitron/dataset/utils.py
+++ b/pytorch3d/implicitron/dataset/utils.py
@@ -329,6 +329,7 @@ def adjust_camera_to_bbox_crop_(
 
     focal_length_px, principal_point_px = _convert_ndc_to_pixels(
         camera.focal_length[0],
+        # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[Any, A...
         camera.principal_point[0],
         image_size_wh,
     )
@@ -341,6 +342,7 @@ def adjust_camera_to_bbox_crop_(
     )
 
     camera.focal_length = focal_length[None]
+    # pyre-fixme[16]: `PerspectiveCameras` has no attribute `principal_point`.
     camera.principal_point = principal_point_cropped[None]
 
 
@@ -352,6 +354,7 @@ def adjust_camera_to_image_scale_(
 ) -> PerspectiveCameras:
     focal_length_px, principal_point_px = _convert_ndc_to_pixels(
         camera.focal_length[0],
+        # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[Any, A...
         camera.principal_point[0],
         original_size_wh,
     )
@@ -368,6 +371,7 @@ def adjust_camera_to_image_scale_(
         image_size_wh_output,
     )
     camera.focal_length = focal_length_scaled[None]
+    # pyre-fixme[16]: `PerspectiveCameras` has no attribute `principal_point`.
     camera.principal_point = principal_point_scaled[None]
 
 
diff --git a/pytorch3d/implicitron/models/feature_extractor/resnet_feature_extractor.py b/pytorch3d/implicitron/models/feature_extractor/resnet_feature_extractor.py
index 216e5531..d90b8234 100644
--- a/pytorch3d/implicitron/models/feature_extractor/resnet_feature_extractor.py
+++ b/pytorch3d/implicitron/models/feature_extractor/resnet_feature_extractor.py
@@ -142,9 +142,15 @@ class ResNetFeatureExtractor(FeatureExtractorBase):
         return f"res_layer_{stage + 1}"
 
     def _resnet_normalize_image(self, img: torch.Tensor) -> torch.Tensor:
+        # pyre-fixme[58]: `-` is not supported for operand types `Tensor` and
+        #  `Union[Tensor, Module]`.
+        # pyre-fixme[58]: `/` is not supported for operand types `Tensor` and
+        #  `Union[Tensor, Module]`.
         return (img - self._resnet_mean) / self._resnet_std
 
     def get_feat_dims(self) -> int:
+        # pyre-fixme[29]: `Union[(self: TensorBase) -> Tensor, Tensor, Module]` is
+        #  not a function.
         return sum(self._feat_dim.values())
 
     def forward(
@@ -183,7 +189,12 @@ class ResNetFeatureExtractor(FeatureExtractorBase):
             else:
                 imgs_normed = imgs_resized
             #  is not a function.
+            # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
             feats = self.stem(imgs_normed)
+            # pyre-fixme[6]: For 1st argument expected `Iterable[_T1]` but got
+            #  `Union[Tensor, Module]`.
+            # pyre-fixme[6]: For 2nd argument expected `Iterable[_T2]` but got
+            #  `Union[Tensor, Module]`.
             for stage, (layer, proj) in enumerate(zip(self.layers, self.proj_layers)):
                 feats = layer(feats)
                 # just a sanity check below
diff --git a/pytorch3d/implicitron/models/generic_model.py b/pytorch3d/implicitron/models/generic_model.py
index 428b4ccc..3edd06c1 100644
--- a/pytorch3d/implicitron/models/generic_model.py
+++ b/pytorch3d/implicitron/models/generic_model.py
@@ -478,6 +478,8 @@ class GenericModel(ImplicitronModelBase):
             )
         custom_args["global_code"] = global_code
 
+        # pyre-fixme[29]: `Union[(self: Tensor) -> Any, Tensor, Module]` is not a
+        #  function.
         for func in self._implicit_functions:
             func.bind_args(**custom_args)
 
@@ -500,6 +502,8 @@ class GenericModel(ImplicitronModelBase):
         # Unbind the custom arguments to prevent pytorch from storing
         # large buffers of intermediate results due to points in the
         # bound arguments.
+        # pyre-fixme[29]: `Union[(self: Tensor) -> Any, Tensor, Module]` is not a
+        #  function.
         for func in self._implicit_functions:
             func.unbind_args()
 
diff --git a/pytorch3d/implicitron/models/global_encoder/autodecoder.py b/pytorch3d/implicitron/models/global_encoder/autodecoder.py
index 0d941bf6..f4b48513 100644
--- a/pytorch3d/implicitron/models/global_encoder/autodecoder.py
+++ b/pytorch3d/implicitron/models/global_encoder/autodecoder.py
@@ -71,6 +71,7 @@ class Autodecoder(Configurable, torch.nn.Module):
         return key_map
 
     def calculate_squared_encoding_norm(self) -> Optional[torch.Tensor]:
+        # pyre-fixme[16]: Item `Tensor` of `Tensor | Module` has no attribute `weight`.
         return (self._autodecoder_codes.weight**2).mean()
 
     def get_encoding_dim(self) -> int:
@@ -95,6 +96,7 @@ class Autodecoder(Configurable, torch.nn.Module):
                 # pyre-fixme[9]: x has type `Union[List[str], LongTensor]`; used as
                 #  `Tensor`.
                 x = torch.tensor(
+                    # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, ...
                     [self._key_map[elem] for elem in x],
                     dtype=torch.long,
                     device=next(self.parameters()).device,
@@ -102,6 +104,7 @@ class Autodecoder(Configurable, torch.nn.Module):
             except StopIteration:
                 raise ValueError("Not enough n_instances in the autodecoder") from None
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         return self._autodecoder_codes(x)
 
     def _load_key_map_hook(
diff --git a/pytorch3d/implicitron/models/global_encoder/global_encoder.py b/pytorch3d/implicitron/models/global_encoder/global_encoder.py
index 3c0f2b9b..c31dbfc1 100644
--- a/pytorch3d/implicitron/models/global_encoder/global_encoder.py
+++ b/pytorch3d/implicitron/models/global_encoder/global_encoder.py
@@ -122,6 +122,7 @@ class HarmonicTimeEncoder(GlobalEncoderBase, torch.nn.Module):
         if frame_timestamp.shape[-1] != 1:
             raise ValueError("Frame timestamp's last dimensions should be one.")
         time = frame_timestamp / self.time_divisor
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         return self._harmonic_embedding(time)
 
     def calculate_squared_encoding_norm(self) -> Optional[torch.Tensor]:
diff --git a/pytorch3d/implicitron/models/implicit_function/decoding_functions.py b/pytorch3d/implicitron/models/implicit_function/decoding_functions.py
index c4c125e8..aaa4423c 100644
--- a/pytorch3d/implicitron/models/implicit_function/decoding_functions.py
+++ b/pytorch3d/implicitron/models/implicit_function/decoding_functions.py
@@ -232,9 +232,14 @@ class MLPWithInputSkips(Configurable, torch.nn.Module):
             # if the skip tensor is None, we use `x` instead.
             z = x
         skipi = 0
+        # pyre-fixme[6]: For 1st argument expected `Iterable[_T]` but got
+        #  `Union[Tensor, Module]`.
         for li, layer in enumerate(self.mlp):
+            # pyre-fixme[58]: `in` is not supported for right operand type
+            #  `Union[Tensor, Module]`.
             if li in self._input_skips:
                 if self._skip_affine_trans:
+                    # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, ...
                     y = self._apply_affine_layer(self.skip_affines[skipi], y, z)
                 else:
                     y = torch.cat((y, z), dim=-1)
diff --git a/pytorch3d/implicitron/models/implicit_function/idr_feature_field.py b/pytorch3d/implicitron/models/implicit_function/idr_feature_field.py
index be98b878..11b1dbf0 100644
--- a/pytorch3d/implicitron/models/implicit_function/idr_feature_field.py
+++ b/pytorch3d/implicitron/models/implicit_function/idr_feature_field.py
@@ -141,11 +141,16 @@ class IdrFeatureField(ImplicitFunctionBase, torch.nn.Module):
             self.embed_fn is None and fun_viewpool is None and global_code is None
         ):
             return torch.tensor(
-                [], device=rays_points_world.device, dtype=rays_points_world.dtype
+                [],
+                device=rays_points_world.device,
+                dtype=rays_points_world.dtype,
+                # pyre-fixme[6]: For 2nd argument expected `Union[int, SymInt]` but got
+                #  `Union[Module, Tensor]`.
             ).view(0, self.out_dim)
 
         embeddings = []
         if self.embed_fn is not None:
+            # pyre-fixme[29]: `Union[Module, Tensor]` is not a function.
             embeddings.append(self.embed_fn(rays_points_world))
 
         if fun_viewpool is not None:
@@ -164,13 +169,19 @@ class IdrFeatureField(ImplicitFunctionBase, torch.nn.Module):
 
         embedding = torch.cat(embeddings, dim=-1)
         x = embedding
+        # pyre-fixme[29]: `Union[(self: TensorBase, other: Union[bool, complex,
+        #  float, int, Tensor]) -> Tensor, Module, Tensor]` is not a function.
         for layer_idx in range(self.num_layers - 1):
             if layer_idx in self.skip_in:
                 x = torch.cat([x, embedding], dim=-1) / 2**0.5
 
+            # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[An...
             x = self.linear_layers[layer_idx](x)
 
+            # pyre-fixme[29]: `Union[(self: TensorBase, other: Union[bool, complex,
+            #  float, int, Tensor]) -> Tensor, Module, Tensor]` is not a function.
             if layer_idx < self.num_layers - 2:
+                # pyre-fixme[29]: `Union[Module, Tensor]` is not a function.
                 x = self.softplus(x)
 
         return x
diff --git a/pytorch3d/implicitron/models/implicit_function/neural_radiance_field.py b/pytorch3d/implicitron/models/implicit_function/neural_radiance_field.py
index 00f3aa65..7e61f2a0 100644
--- a/pytorch3d/implicitron/models/implicit_function/neural_radiance_field.py
+++ b/pytorch3d/implicitron/models/implicit_function/neural_radiance_field.py
@@ -123,8 +123,10 @@ class NeuralRadianceFieldBase(ImplicitFunctionBase, torch.nn.Module):
         # Normalize the ray_directions to unit l2 norm.
         rays_directions_normed = torch.nn.functional.normalize(rays_directions, dim=-1)
         # Obtain the harmonic embedding of the normalized ray directions.
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         rays_embedding = self.harmonic_embedding_dir(rays_directions_normed)
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         return self.color_layer((self.intermediate_linear(features), rays_embedding))
 
     @staticmethod
@@ -195,6 +197,8 @@ class NeuralRadianceFieldBase(ImplicitFunctionBase, torch.nn.Module):
         embeds = create_embeddings_for_implicit_function(
             xyz_world=rays_points_world,
             #  for 2nd param but got `Union[None, torch.Tensor, torch.nn.Module]`.
+            # pyre-fixme[6]: For 2nd argument expected `Optional[(...) -> Any]` but
+            #  got `Union[None, Tensor, Module]`.
             xyz_embedding_function=(
                 self.harmonic_embedding_xyz if self.input_xyz else None
             ),
@@ -206,12 +210,14 @@ class NeuralRadianceFieldBase(ImplicitFunctionBase, torch.nn.Module):
         )
 
         # embeds.shape = [minibatch x n_src x n_rays x n_pts x self.n_harmonic_functions*6+3]
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         features = self.xyz_encoder(embeds)
         # features.shape = [minibatch x ... x self.n_hidden_neurons_xyz]
         # NNs operate on the flattenned rays; reshaping to the correct spatial size
         # TODO: maybe make the transformer work on non-flattened tensors to avoid this reshape
         features = features.reshape(*rays_points_world.shape[:-1], -1)
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         raw_densities = self.density_layer(features)
         # raw_densities.shape = [minibatch x ... x 1] in [0-1]
 
@@ -219,6 +225,8 @@ class NeuralRadianceFieldBase(ImplicitFunctionBase, torch.nn.Module):
             if camera is None:
                 raise ValueError("Camera must be given if xyz_ray_dir_in_camera_coords")
 
+            # pyre-fixme[58]: `@` is not supported for operand types `Tensor` and
+            #  `Union[Tensor, Module]`.
             directions = ray_bundle.directions @ camera.R
         else:
             directions = ray_bundle.directions
diff --git a/pytorch3d/implicitron/models/implicit_function/scene_representation_networks.py b/pytorch3d/implicitron/models/implicit_function/scene_representation_networks.py
index 35e07992..f8702e50 100644
--- a/pytorch3d/implicitron/models/implicit_function/scene_representation_networks.py
+++ b/pytorch3d/implicitron/models/implicit_function/scene_representation_networks.py
@@ -103,6 +103,8 @@ class SRNRaymarchFunction(Configurable, torch.nn.Module):
 
         embeds = create_embeddings_for_implicit_function(
             xyz_world=rays_points_world,
+            # pyre-fixme[6]: For 2nd argument expected `Optional[(...) -> Any]` but
+            #  got `Union[Tensor, Module]`.
             xyz_embedding_function=self._harmonic_embedding,
             global_code=global_code,
             fun_viewpool=fun_viewpool,
@@ -112,6 +114,7 @@ class SRNRaymarchFunction(Configurable, torch.nn.Module):
 
         # Before running the network, we have to resize embeds to ndims=3,
         # otherwise the SRN layers consume huge amounts of memory.
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         raymarch_features = self._net(
             embeds.view(embeds.shape[0], -1, embeds.shape[-1])
         )
@@ -166,7 +169,9 @@ class SRNPixelGenerator(Configurable, torch.nn.Module):
         # Normalize the ray_directions to unit l2 norm.
         rays_directions_normed = torch.nn.functional.normalize(rays_directions, dim=-1)
         # Obtain the harmonic embedding of the normalized ray directions.
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         rays_embedding = self._harmonic_embedding(rays_directions_normed)
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         return self._color_layer((features, rays_embedding))
 
     def forward(
@@ -195,6 +200,7 @@ class SRNPixelGenerator(Configurable, torch.nn.Module):
                 denoting the color of each ray point.
         """
         # raymarch_features.shape = [minibatch x ... x pts_per_ray x 3]
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         features = self._net(raymarch_features)
         # features.shape = [minibatch x ... x self.n_hidden_units]
 
@@ -202,6 +208,8 @@ class SRNPixelGenerator(Configurable, torch.nn.Module):
             if camera is None:
                 raise ValueError("Camera must be given if xyz_ray_dir_in_camera_coords")
 
+            # pyre-fixme[58]: `@` is not supported for operand types `Tensor` and
+            #  `Union[Tensor, Module]`.
             directions = ray_bundle.directions @ camera.R
         else:
             directions = ray_bundle.directions
@@ -209,6 +217,7 @@ class SRNPixelGenerator(Configurable, torch.nn.Module):
         # NNs operate on the flattenned rays; reshaping to the correct spatial size
         features = features.reshape(*raymarch_features.shape[:-1], -1)
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         raw_densities = self._density_layer(features)
 
         rays_colors = self._get_colors(features, directions)
@@ -269,6 +278,7 @@ class SRNRaymarchHyperNet(Configurable, torch.nn.Module):
         srn_raymarch_function.
         """
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         net = self._hypernet(global_code)
 
         # use the hyper-net generated network to instantiate the raymarch module
@@ -304,6 +314,8 @@ class SRNRaymarchHyperNet(Configurable, torch.nn.Module):
         # across LSTM iterations for the same global_code.
         if self.cached_srn_raymarch_function is None:
             # generate the raymarching network from the hypernet
+            # pyre-fixme[16]: `SRNRaymarchHyperNet` has no attribute
+            #  `cached_srn_raymarch_function`.
             self.cached_srn_raymarch_function = self._run_hypernet(global_code)
         (srn_raymarch_function,) = cast(
             Tuple[SRNRaymarchFunction], self.cached_srn_raymarch_function
@@ -331,6 +343,7 @@ class SRNImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
     def create_raymarch_function(self) -> None:
         self.raymarch_function = SRNRaymarchFunction(
             latent_dim=self.latent_dim,
+            # pyre-fixme[32]: Keyword argument must be a mapping with string keys.
             **self.raymarch_function_args,
         )
 
@@ -389,6 +402,7 @@ class SRNHyperNetImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
         self.hypernet = SRNRaymarchHyperNet(
             latent_dim=self.latent_dim,
             latent_dim_hypernet=self.latent_dim_hypernet,
+            # pyre-fixme[32]: Keyword argument must be a mapping with string keys.
             **self.hypernet_args,
         )
 
diff --git a/pytorch3d/implicitron/models/implicit_function/voxel_grid.py b/pytorch3d/implicitron/models/implicit_function/voxel_grid.py
index 48e22eb2..9b9ddbab 100644
--- a/pytorch3d/implicitron/models/implicit_function/voxel_grid.py
+++ b/pytorch3d/implicitron/models/implicit_function/voxel_grid.py
@@ -269,6 +269,7 @@ class VoxelGridBase(ReplaceableBase, torch.nn.Module):
                 for name, tensor in vars(grid_values_with_wanted_resolution).items()
             }
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         return self.values_type(**params), True
 
     def get_resolution_change_epochs(self) -> Tuple[int, ...]:
@@ -882,6 +883,7 @@ class VoxelGridModule(Configurable, torch.nn.Module):
             torch.Tensor of shape (..., n_features)
         """
         locator = self._get_volume_locator()
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         grid_values = self.voxel_grid.values_type(**self.params)
         # voxel grids operate with extra n_grids dimension, which we fix to one
         return self.voxel_grid.evaluate_world(points[None], grid_values, locator)[0]
@@ -895,6 +897,7 @@ class VoxelGridModule(Configurable, torch.nn.Module):
                 replace current parameters
         """
         if self.hold_voxel_grid_as_parameters:
+            # pyre-fixme[16]: `VoxelGridModule` has no attribute `params`.
             self.params = torch.nn.ParameterDict(
                 {
                     k: torch.nn.Parameter(val)
@@ -945,6 +948,7 @@ class VoxelGridModule(Configurable, torch.nn.Module):
         Returns:
             True if parameter change has happened else False.
         """
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         grid_values = self.voxel_grid.values_type(**self.params)
         grid_values, change = self.voxel_grid.change_resolution(
             grid_values, epoch=epoch
@@ -992,16 +996,21 @@ class VoxelGridModule(Configurable, torch.nn.Module):
         """
         '''
         new_params = {}
+        # pyre-fixme[29]: `Union[(self: Tensor) -> Any, Tensor, Module]` is not a
+        #  function.
         for name in self.params:
             key = prefix + "params." + name
             if key in state_dict:
                 new_params[name] = torch.zeros_like(state_dict[key])
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         self.set_voxel_grid_parameters(self.voxel_grid.values_type(**new_params))
 
     def get_device(self) -> torch.device:
         """
         Returns torch.device on which module parameters are located
         """
+        # pyre-fixme[29]: `Union[(self: TensorBase) -> Tensor, Tensor, Module]` is
+        #  not a function.
         return next(val for val in self.params.values() if val is not None).device
 
     def crop_self(self, min_point: torch.Tensor, max_point: torch.Tensor) -> None:
@@ -1018,6 +1027,7 @@ class VoxelGridModule(Configurable, torch.nn.Module):
         """
         locator = self._get_volume_locator()
         #  torch.nn.modules.module.Module]` is not a function.
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         old_grid_values = self.voxel_grid.values_type(**self.params)
         new_grid_values = self.voxel_grid.crop_world(
             min_point, max_point, old_grid_values, locator
@@ -1025,6 +1035,7 @@ class VoxelGridModule(Configurable, torch.nn.Module):
         grid_values, _ = self.voxel_grid.change_resolution(
             new_grid_values, grid_values_with_wanted_resolution=old_grid_values
         )
+        # pyre-fixme[16]: `VoxelGridModule` has no attribute `params`.
         self.params = torch.nn.ParameterDict(
             {
                 k: torch.nn.Parameter(val)
diff --git a/pytorch3d/implicitron/models/implicit_function/voxel_grid_implicit_function.py b/pytorch3d/implicitron/models/implicit_function/voxel_grid_implicit_function.py
index ec963b35..407d4c36 100644
--- a/pytorch3d/implicitron/models/implicit_function/voxel_grid_implicit_function.py
+++ b/pytorch3d/implicitron/models/implicit_function/voxel_grid_implicit_function.py
@@ -192,16 +192,26 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
 
     def __post_init__(self) -> None:
         run_auto_creation(self)
+        # pyre-fixme[16]: `VoxelGridImplicitFunction` has no attribute
+        #  `voxel_grid_scaffold`.
         self.voxel_grid_scaffold = self._create_voxel_grid_scaffold()
+        # pyre-fixme[16]: `VoxelGridImplicitFunction` has no attribute
+        #  `harmonic_embedder_xyz_density`.
         self.harmonic_embedder_xyz_density = HarmonicEmbedding(
             **self.harmonic_embedder_xyz_density_args
         )
+        # pyre-fixme[16]: `VoxelGridImplicitFunction` has no attribute
+        #  `harmonic_embedder_xyz_color`.
         self.harmonic_embedder_xyz_color = HarmonicEmbedding(
             **self.harmonic_embedder_xyz_color_args
         )
+        # pyre-fixme[16]: `VoxelGridImplicitFunction` has no attribute
+        #  `harmonic_embedder_dir_color`.
         self.harmonic_embedder_dir_color = HarmonicEmbedding(
             **self.harmonic_embedder_dir_color_args
         )
+        # pyre-fixme[16]: `VoxelGridImplicitFunction` has no attribute
+        #  `_scaffold_ready`.
         self._scaffold_ready = False
 
     def forward(
@@ -252,6 +262,7 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
         # ########## filter the points using the scaffold ########## #
         if self._scaffold_ready and self.scaffold_filter_points:
             with torch.no_grad():
+                # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
                 non_empty_points = self.voxel_grid_scaffold(points)[..., 0] > 0
             points = points[non_empty_points]
             if len(points) == 0:
@@ -363,6 +374,7 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
                 feature dimensionality which `decoder_density` returns
         """
         embeds_density = self.voxel_grid_density(points)
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         harmonic_embedding_density = self.harmonic_embedder_xyz_density(embeds_density)
         # shape = [..., density_dim]
         return self.decoder_density(harmonic_embedding_density)
@@ -397,6 +409,8 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
         if self.xyz_ray_dir_in_camera_coords:
             if camera is None:
                 raise ValueError("Camera must be given if xyz_ray_dir_in_camera_coords")
+            # pyre-fixme[58]: `@` is not supported for operand types `Tensor` and
+            #  `Union[Tensor, Module]`.
             directions = directions @ camera.R
 
         # ########## get voxel grid output ########## #
@@ -405,11 +419,13 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
 
         # ########## embed with the harmonic function ########## #
         # Obtain the harmonic embedding of the voxel grid output.
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         harmonic_embedding_color = self.harmonic_embedder_xyz_color(embeds_color)
 
         # Normalize the ray_directions to unit l2 norm.
         rays_directions_normed = torch.nn.functional.normalize(directions, dim=-1)
         # Obtain the harmonic embedding of the normalized ray directions.
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         harmonic_embedding_dir = self.harmonic_embedder_dir_color(
             rays_directions_normed
         )
@@ -478,8 +494,11 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
             an object inside, else False.
         """
         # find bounding box
+        # pyre-fixme[16]: Item `Tensor` of `Tensor | Module` has no attribute
+        #  `get_grid_points`.
         points = self.voxel_grid_scaffold.get_grid_points(epoch=epoch)
         assert self._scaffold_ready, "Scaffold has to be calculated before cropping."
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         occupancy = self.voxel_grid_scaffold(points)[..., 0] > 0
         non_zero_idxs = torch.nonzero(occupancy)
         if len(non_zero_idxs) == 0:
@@ -511,6 +530,8 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
         """
 
         planes = []
+        # pyre-fixme[16]: Item `Tensor` of `Tensor | Module` has no attribute
+        #  `get_grid_points`.
         points = self.voxel_grid_scaffold.get_grid_points(epoch=epoch)
 
         chunk_size = (
@@ -530,7 +551,10 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
             stride=1,
         )
         occupancy_cube = density_cube > self.scaffold_empty_space_threshold
+        # pyre-fixme[16]: Item `Tensor` of `Tensor | Module` has no attribute `params`.
         self.voxel_grid_scaffold.params["voxel_grid"] = occupancy_cube.float()
+        # pyre-fixme[16]: `VoxelGridImplicitFunction` has no attribute
+        #  `_scaffold_ready`.
         self._scaffold_ready = True
 
         return False
@@ -547,6 +571,8 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
         decoding function to this value.
         """
         grid_args = self.voxel_grid_density_args
+        # pyre-fixme[6]: For 1st argument expected `DictConfig` but got
+        #  `Union[Tensor, Module]`.
         grid_output_dim = VoxelGridModule.get_output_dim(grid_args)
 
         embedder_args = self.harmonic_embedder_xyz_density_args
@@ -575,6 +601,8 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
         decoding function to this value.
         """
         grid_args = self.voxel_grid_color_args
+        # pyre-fixme[6]: For 1st argument expected `DictConfig` but got
+        #  `Union[Tensor, Module]`.
         grid_output_dim = VoxelGridModule.get_output_dim(grid_args)
 
         embedder_args = self.harmonic_embedder_xyz_color_args
@@ -608,7 +636,9 @@ class VoxelGridImplicitFunction(ImplicitFunctionBase, torch.nn.Module):
                     `self.voxel_grid_density`
         """
         return VoxelGridModule(
+            # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[An...
             extents=self.voxel_grid_density_args["extents"],
+            # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[An...
             translation=self.voxel_grid_density_args["translation"],
             voxel_grid_class_type="FullResolutionVoxelGrid",
             hold_voxel_grid_as_parameters=False,
diff --git a/pytorch3d/implicitron/models/renderer/lstm_renderer.py b/pytorch3d/implicitron/models/renderer/lstm_renderer.py
index 0e95dc63..02a9c7aa 100644
--- a/pytorch3d/implicitron/models/renderer/lstm_renderer.py
+++ b/pytorch3d/implicitron/models/renderer/lstm_renderer.py
@@ -135,6 +135,7 @@ class LSTMRenderer(BaseRenderer, torch.nn.Module):
                 break
 
             # run the lstm marcher
+            # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
             state_h, state_c = self._lstm(
                 raymarch_features.view(-1, raymarch_features.shape[-1]),
                 states[-1],
@@ -142,6 +143,7 @@ class LSTMRenderer(BaseRenderer, torch.nn.Module):
             if state_h.requires_grad:
                 state_h.register_hook(lambda x: x.clamp(min=-10, max=10))
             # predict the next step size
+            # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
             signed_distance = self._out_layer(state_h).view(ray_bundle_t.lengths.shape)
             # log the lstm states
             states.append((state_h, state_c))
diff --git a/pytorch3d/implicitron/models/renderer/ray_sampler.py b/pytorch3d/implicitron/models/renderer/ray_sampler.py
index 11ee27b0..417d0ae6 100644
--- a/pytorch3d/implicitron/models/renderer/ray_sampler.py
+++ b/pytorch3d/implicitron/models/renderer/ray_sampler.py
@@ -207,6 +207,7 @@ class AbstractMaskRaySampler(RaySamplerBase, torch.nn.Module):
         """
         sample_mask = None
         if (
+            # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[An...
             self._sampling_mode[evaluation_mode] == RenderSamplingMode.MASK_SAMPLE
             and mask is not None
         ):
@@ -223,6 +224,7 @@ class AbstractMaskRaySampler(RaySamplerBase, torch.nn.Module):
             EvaluationMode.EVALUATION: self._evaluation_raysampler,
         }[evaluation_mode]
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         ray_bundle = raysampler(
             cameras=cameras,
             mask=sample_mask,
@@ -240,6 +242,8 @@ class AbstractMaskRaySampler(RaySamplerBase, torch.nn.Module):
                 "Heterogeneous ray bundle is not supported for conical frustum computation yet"
             )
         elif self.cast_ray_bundle_as_cone:
+            # pyre-fixme[9]: pixel_hw has type `Tuple[float, float]`; used as
+            #  `Tuple[Union[Tensor, Module], Union[Tensor, Module]]`.
             pixel_hw: Tuple[float, float] = (self.pixel_height, self.pixel_width)
             pixel_radii_2d = compute_radii(cameras, ray_bundle.xys[..., :2], pixel_hw)
             return ImplicitronRayBundle(
diff --git a/pytorch3d/implicitron/models/renderer/raymarcher.py b/pytorch3d/implicitron/models/renderer/raymarcher.py
index 5544590c..2bca6e77 100644
--- a/pytorch3d/implicitron/models/renderer/raymarcher.py
+++ b/pytorch3d/implicitron/models/renderer/raymarcher.py
@@ -179,8 +179,10 @@ class AccumulativeRaymarcherBase(RaymarcherBase, torch.nn.Module):
             rays_densities = torch.relu(rays_densities)
 
         weighted_densities = deltas * rays_densities
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         capped_densities = self._capping_function(weighted_densities)
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         rays_opacities = self._capping_function(
             torch.cumsum(weighted_densities, dim=-1)
         )
@@ -190,6 +192,7 @@ class AccumulativeRaymarcherBase(RaymarcherBase, torch.nn.Module):
         )
         absorption_shifted[..., : self.surface_thickness] = 1.0
 
+        # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
         weights = self._weight_function(capped_densities, absorption_shifted)
         features = (weights[..., None] * rays_features).sum(dim=-2)
         depth = (weights * ray_lengths)[..., None].sum(dim=-2)
@@ -197,6 +200,8 @@ class AccumulativeRaymarcherBase(RaymarcherBase, torch.nn.Module):
         alpha = opacities if self.blend_output else 1
         if self._bg_color.shape[-1] not in [1, features.shape[-1]]:
             raise ValueError("Wrong number of background color channels.")
+        # pyre-fixme[58]: `*` is not supported for operand types `int` and
+        #  `Union[Tensor, Module]`.
         features = alpha * features + (1 - opacities) * self._bg_color
 
         return RendererOutput(
diff --git a/pytorch3d/implicitron/models/renderer/sdf_renderer.py b/pytorch3d/implicitron/models/renderer/sdf_renderer.py
index 1977ea55..57d65b98 100644
--- a/pytorch3d/implicitron/models/renderer/sdf_renderer.py
+++ b/pytorch3d/implicitron/models/renderer/sdf_renderer.py
@@ -61,6 +61,7 @@ class SignedDistanceFunctionRenderer(BaseRenderer, torch.nn.Module):
 
     def create_ray_tracer(self) -> None:
         self.ray_tracer = RayTracing(
+            # pyre-fixme[32]: Keyword argument must be a mapping with string keys.
             **self.ray_tracer_args,
             object_bounding_sphere=self.object_bounding_sphere,
         )
@@ -149,6 +150,8 @@ class SignedDistanceFunctionRenderer(BaseRenderer, torch.nn.Module):
                 n_eik_points,
                 3,
                 #  but got `Union[device, Tensor, Module]`.
+                # pyre-fixme[6]: For 3rd argument expected `Union[None, int, str,
+                #  device]` but got `Union[device, Tensor, Module]`.
                 device=self._bg_color.device,
             ).uniform_(-eik_bounding_box, eik_bounding_box)
             eikonal_pixel_points = points.clone()
@@ -205,6 +208,7 @@ class SignedDistanceFunctionRenderer(BaseRenderer, torch.nn.Module):
             ]
             normals_full.view(-1, 3)[surface_mask] = normals
             render_full.view(-1, self.render_features_dimensions)[surface_mask] = (
+                # pyre-fixme[29]: `Union[Tensor, Module]` is not a function.
                 self._rgb_network(
                     features,
                     differentiable_surface_points[None],
diff --git a/pytorch3d/implicitron/models/view_pooler/feature_aggregator.py b/pytorch3d/implicitron/models/view_pooler/feature_aggregator.py
index c223be22..5d600b01 100644
--- a/pytorch3d/implicitron/models/view_pooler/feature_aggregator.py
+++ b/pytorch3d/implicitron/models/view_pooler/feature_aggregator.py
@@ -532,6 +532,7 @@ def _get_ray_dir_dot_prods(camera: CamerasBase, pts: torch.Tensor):
 
     # does not produce nans randomly unlike get_camera_center() below
     cam_centers_rep = -torch.bmm(
+        # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[Any, A...
         camera_rep.T[:, None],
         camera_rep.R.permute(0, 2, 1),
     ).reshape(-1, *([1] * (pts.ndim - 2)), 3)
diff --git a/pytorch3d/ops/cameras_alignment.py b/pytorch3d/ops/cameras_alignment.py
index 40e00aba..3b2becb8 100644
--- a/pytorch3d/ops/cameras_alignment.py
+++ b/pytorch3d/ops/cameras_alignment.py
@@ -122,12 +122,17 @@ def corresponding_cameras_alignment(
 
     # create a new cameras object and set the R and T accordingly
     cameras_src_aligned = cameras_src.clone()
+    # pyre-fixme[6]: For 2nd argument expected `Tensor` but got `Union[Tensor, Module]`.
     cameras_src_aligned.R = torch.bmm(align_t_R.expand_as(cameras_src.R), cameras_src.R)
     cameras_src_aligned.T = (
         torch.bmm(
             align_t_T[:, None].repeat(cameras_src.R.shape[0], 1, 1),
+            # pyre-fixme[6]: For 2nd argument expected `Tensor` but got
+            #  `Union[Tensor, Module]`.
             cameras_src.R,
         )[:, 0]
+        # pyre-fixme[29]: `Union[(self: TensorBase, other: Union[bool, complex,
+        #  float, int, Tensor]) -> Tensor, Tensor, Module]` is not a function.
         + cameras_src.T * align_t_s
     )
 
@@ -175,6 +180,7 @@ def _align_camera_extrinsics(
         R_A = (U V^T)^T
         ```
     """
+    # pyre-fixme[6]: For 1st argument expected `Tensor` but got `Union[Tensor, Module]`.
     RRcov = torch.bmm(cameras_src.R, cameras_tgt.R.transpose(2, 1)).mean(0)
     U, _, V = torch.svd(RRcov)
     align_t_R = V @ U.t()
@@ -204,7 +210,11 @@ def _align_camera_extrinsics(
         T_A = mean(B) - mean(A) * s_A
         ```
     """
+    # pyre-fixme[6]: For 1st argument expected `Tensor` but got `Union[Tensor, Module]`.
+    # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[Any, Any, ...
     A = torch.bmm(cameras_src.R, cameras_src.T[:, :, None])[:, :, 0]
+    # pyre-fixme[6]: For 1st argument expected `Tensor` but got `Union[Tensor, Module]`.
+    # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[Any, Any, ...
     B = torch.bmm(cameras_src.R, cameras_tgt.T[:, :, None])[:, :, 0]
     Amu = A.mean(0, keepdim=True)
     Bmu = B.mean(0, keepdim=True)
diff --git a/pytorch3d/renderer/camera_conversions.py b/pytorch3d/renderer/camera_conversions.py
index d18707a3..97e5ecb6 100644
--- a/pytorch3d/renderer/camera_conversions.py
+++ b/pytorch3d/renderer/camera_conversions.py
@@ -65,7 +65,11 @@ def _opencv_from_cameras_projection(
     cameras: PerspectiveCameras,
     image_size: torch.Tensor,
 ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+    # pyre-fixme[29]: `Union[(self: TensorBase, memory_format:
+    #  Optional[memory_format] = ...) -> Tensor, Tensor, Module]` is not a function.
     R_pytorch3d = cameras.R.clone()
+    # pyre-fixme[29]: `Union[(self: TensorBase, memory_format:
+    #  Optional[memory_format] = ...) -> Tensor, Tensor, Module]` is not a function.
     T_pytorch3d = cameras.T.clone()
     focal_pytorch3d = cameras.focal_length
     p0_pytorch3d = cameras.principal_point
diff --git a/pytorch3d/renderer/cameras.py b/pytorch3d/renderer/cameras.py
index 7ac72033..bab52aff 100644
--- a/pytorch3d/renderer/cameras.py
+++ b/pytorch3d/renderer/cameras.py
@@ -203,7 +203,9 @@ class CamerasBase(TensorProperties):
         """
         R: torch.Tensor = kwargs.get("R", self.R)
         T: torch.Tensor = kwargs.get("T", self.T)
+        # pyre-fixme[16]: `CamerasBase` has no attribute `R`.
         self.R = R
+        # pyre-fixme[16]: `CamerasBase` has no attribute `T`.
         self.T = T
         world_to_view_transform = get_world_to_view_transform(R=R, T=T)
         return world_to_view_transform
@@ -228,7 +230,9 @@ class CamerasBase(TensorProperties):
             a Transform3d object which represents a batch of transforms
             of shape (N, 3, 3)
         """
+        # pyre-fixme[16]: `CamerasBase` has no attribute `R`.
         self.R: torch.Tensor = kwargs.get("R", self.R)
+        # pyre-fixme[16]: `CamerasBase` has no attribute `T`.
         self.T: torch.Tensor = kwargs.get("T", self.T)
         world_to_view_transform = self.get_world_to_view_transform(R=self.R, T=self.T)
         view_to_proj_transform = self.get_projection_transform(**kwargs)
diff --git a/pytorch3d/renderer/lighting.py b/pytorch3d/renderer/lighting.py
index 4394c3e5..7e019462 100644
--- a/pytorch3d/renderer/lighting.py
+++ b/pytorch3d/renderer/lighting.py
@@ -266,7 +266,9 @@ class PointLights(TensorProperties):
         shape (P, 3) or (N, H, W, K, 3).
         """
         if self.location.ndim == points.ndim:
+            # pyre-fixme[7]: Expected `Tensor` but got `Union[Tensor, Module]`.
             return self.location
+        # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[Any, A...
         return self.location[:, None, None, None, :]
 
     def diffuse(self, normals, points) -> torch.Tensor:
diff --git a/pytorch3d/vis/plotly_vis.py b/pytorch3d/vis/plotly_vis.py
index 273842ae..bb15c764 100644
--- a/pytorch3d/vis/plotly_vis.py
+++ b/pytorch3d/vis/plotly_vis.py
@@ -588,9 +588,15 @@ def _add_struct_from_batch(
     if isinstance(batched_struct, CamerasBase):
         # we can't index directly into camera batches
         R, T = batched_struct.R, batched_struct.T
+        # pyre-fixme[6]: For 1st argument expected
+        #  `pyre_extensions.PyreReadOnly[Sized]` but got `Union[Tensor, Module]`.
         r_idx = min(scene_num, len(R) - 1)
+        # pyre-fixme[6]: For 1st argument expected
+        #  `pyre_extensions.PyreReadOnly[Sized]` but got `Union[Tensor, Module]`.
         t_idx = min(scene_num, len(T) - 1)
+        # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[Any, A...
         R = R[r_idx].unsqueeze(0)
+        # pyre-fixme[29]: `Union[(self: TensorBase, indices: Union[None, slice[Any, A...
         T = T[t_idx].unsqueeze(0)
         struct = CamerasBase(device=batched_struct.device, R=R, T=T)
     elif _is_ray_bundle(batched_struct) and not _is_heterogeneous_ray_bundle(