pytorch3d/renderer/mesh/shader.py [114:143]:
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    def __init__(
        self,
        device: Device = "cpu",
        cameras: Optional[TensorProperties] = None,
        lights: Optional[TensorProperties] = None,
        materials: Optional[Materials] = None,
        blend_params: Optional[BlendParams] = None,
    ) -> None:
        super().__init__()
        self.lights = lights if lights is not None else PointLights(device=device)
        self.materials = (
            materials if materials is not None else Materials(device=device)
        )
        self.cameras = cameras
        self.blend_params = blend_params if blend_params is not None else BlendParams()

    # pyre-fixme[14]: `to` overrides method defined in `Module` inconsistently.
    def to(self, device: Device):
        # Manually move to device modules which are not subclasses of nn.Module
        cameras = self.cameras
        if cameras is not None:
            self.cameras = cameras.to(device)
        self.materials = self.materials.to(device)
        self.lights = self.lights.to(device)
        return self

    def forward(self, fragments: Fragments, meshes: Meshes, **kwargs) -> torch.Tensor:
        cameras = kwargs.get("cameras", self.cameras)
        if cameras is None:
            msg = "Cameras must be specified either at initialization \
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pytorch3d/renderer/mesh/shader.py [249:278]:
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    def __init__(
        self,
        device: Device = "cpu",
        cameras: Optional[TensorProperties] = None,
        lights: Optional[TensorProperties] = None,
        materials: Optional[Materials] = None,
        blend_params: Optional[BlendParams] = None,
    ) -> None:
        super().__init__()
        self.lights = lights if lights is not None else PointLights(device=device)
        self.materials = (
            materials if materials is not None else Materials(device=device)
        )
        self.cameras = cameras
        self.blend_params = blend_params if blend_params is not None else BlendParams()

    # pyre-fixme[14]: `to` overrides method defined in `Module` inconsistently.
    def to(self, device: Device):
        # Manually move to device modules which are not subclasses of nn.Module
        cameras = self.cameras
        if cameras is not None:
            self.cameras = cameras.to(device)
        self.materials = self.materials.to(device)
        self.lights = self.lights.to(device)
        return self

    def forward(self, fragments: Fragments, meshes: Meshes, **kwargs) -> torch.Tensor:
        cameras = kwargs.get("cameras", self.cameras)
        if cameras is None:
            msg = "Cameras must be specified either at initialization \
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