fix: implement model to func for depth anything

Author: blessedcoolant

invokeai/backend/image_util/depth_anything/depth_anything_pipeline.py

@@ -12,17 +12,20 @@ class DepthAnythingPipeline(RawModel):
     for Invoke's Model Management System"""
 
     def __init__(self, pipeline: DepthEstimationPipeline) -> None:
-        self.pipeline = pipeline
+        self._pipeline = pipeline
 
     def generate_depth(self, image: Image.Image) -> Image.Image:
-        depth_map = self.pipeline(image)["depth"]
+        depth_map = self._pipeline(image)["depth"]
         assert isinstance(depth_map, Image.Image)
         return depth_map
 
     def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None):
-        pass
+        if device is not None and device.type not in {"cpu", "cuda"}:
+            device = None
+        self._pipeline.model.to(device=device, dtype=dtype)
+        self._pipeline.device = self._pipeline.model.device
 
     def calc_size(self) -> int:
         from invokeai.backend.model_manager.load.model_util import calc_module_size
 
-        return calc_module_size(self.pipeline.model)
+        return calc_module_size(self._pipeline.model)