Add get_effective_device(...) utility to aid in determining the effec…

…tive device of models that are partially loaded.

invokeai/backend/image_util/hed.py

@@ -18,6 +18,7 @@
     resize_image_to_resolution,
     safe_step,
 )
+from invokeai.backend.model_manager.load.model_cache.utils import get_effective_device
 
 
 class DoubleConvBlock(torch.nn.Module):
@@ -109,7 +110,7 @@ def run(
         Returns:
             The detected edges.
         """
-        device = next(iter(self.network.parameters())).device
+        device = get_effective_device(self.network)
         np_image = pil_to_np(input_image)
         np_image = normalize_image_channel_count(np_image)
         np_image = resize_image_to_resolution(np_image, detect_resolution)
@@ -183,7 +184,7 @@ def run(self, image: Image.Image, safe: bool = False, scribble: bool = False) ->
             The detected edges.
         """
 
-        device = next(iter(self.model.parameters())).device
+        device = get_effective_device(self.model)
 
         np_image = pil_to_np(image)
 

invokeai/backend/image_util/infill_methods/lama.py

@@ -7,6 +7,7 @@
 
 import invokeai.backend.util.logging as logger
 from invokeai.backend.model_manager.config import AnyModel
+from invokeai.backend.model_manager.load.model_cache.utils import get_effective_device
 
 
 def norm_img(np_img):
@@ -31,7 +32,7 @@ def __call__(self, input_image: Image.Image, *args: Any, **kwds: Any) -> Any:
         mask = norm_img(mask)
         mask = (mask > 0) * 1
 
-        device = next(self._model.buffers()).device
+        device = get_effective_device(self._model)
         image = torch.from_numpy(image).unsqueeze(0).to(device)
         mask = torch.from_numpy(mask).unsqueeze(0).to(device)
 

invokeai/backend/image_util/lineart.py

@@ -17,6 +17,7 @@
     pil_to_np,
     resize_image_to_resolution,
 )
+from invokeai.backend.model_manager.load.model_cache.utils import get_effective_device
 
 
 class ResidualBlock(nn.Module):
@@ -130,7 +131,7 @@ def run(
         Returns:
             The detected lineart.
         """
-        device = next(iter(self.model.parameters())).device
+        device = get_effective_device(self.model)
 
         np_image = pil_to_np(input_image)
         np_image = normalize_image_channel_count(np_image)
@@ -201,7 +202,7 @@ def run(self, image: Image.Image) -> Image.Image:
         Returns:
             The detected edges.
         """
-        device = next(iter(self.model.parameters())).device
+        device = get_effective_device(self.model)
 
         np_image = pil_to_np(image)
 

invokeai/backend/image_util/lineart_anime.py

@@ -19,6 +19,7 @@
     pil_to_np,
     resize_image_to_resolution,
 )
+from invokeai.backend.model_manager.load.model_cache.utils import get_effective_device
 
 
 class UnetGenerator(nn.Module):
@@ -171,7 +172,7 @@ def run(self, input_image: Image.Image, detect_resolution: int = 512, image_reso
         Returns:
             The detected lineart.
         """
-        device = next(iter(self.model.parameters())).device
+        device = get_effective_device(self.model)
         np_image = pil_to_np(input_image)
 
         np_image = normalize_image_channel_count(np_image)
@@ -239,7 +240,7 @@ def to(self, device: torch.device):
 
     def run(self, image: Image.Image) -> Image.Image:
         """Processes an image and returns the detected edges."""
-        device = next(iter(self.model.parameters())).device
+        device = get_effective_device(self.model)
 
         np_image = pil_to_np(image)
 

invokeai/backend/image_util/mlsd/utils.py

@@ -14,6 +14,8 @@
 import torch
 from torch.nn import functional as F
 
+from invokeai.backend.model_manager.load.model_cache.utils import get_effective_device
+
 
 def deccode_output_score_and_ptss(tpMap, topk_n = 200, ksize = 5):
     '''
@@ -49,7 +51,7 @@ def pred_lines(image, model,
                dist_thr=20.0):
     h, w, _ = image.shape
 
-    device = next(iter(model.parameters())).device
+    device = get_effective_device(model)
     h_ratio, w_ratio = [h / input_shape[0], w / input_shape[1]]
 
     resized_image = np.concatenate([cv2.resize(image, (input_shape[1], input_shape[0]), interpolation=cv2.INTER_AREA),
@@ -108,7 +110,7 @@ def pred_squares(image,
     '''
     h, w, _ = image.shape
     original_shape = [h, w]
-    device = next(iter(model.parameters())).device
+    device = get_effective_device(model)
 
     resized_image = np.concatenate([cv2.resize(image, (input_shape[0], input_shape[1]), interpolation=cv2.INTER_AREA),
                                     np.ones([input_shape[0], input_shape[1], 1])], axis=-1)

invokeai/backend/image_util/normal_bae/__init__.py

@@ -13,6 +13,7 @@
 
 from invokeai.backend.image_util.normal_bae.nets.NNET import NNET
 from invokeai.backend.image_util.util import np_to_pil, pil_to_np, resize_to_multiple
+from invokeai.backend.model_manager.load.model_cache.utils import get_effective_device
 
 
 class NormalMapDetector:
@@ -64,7 +65,7 @@ def to(self, device: torch.device):
     def run(self, image: Image.Image):
         """Processes an image and returns the detected normal map."""
 
-        device = next(iter(self.model.parameters())).device
+        device = get_effective_device(self.model)
         np_image = pil_to_np(image)
 
         height, width, _channels = np_image.shape

invokeai/backend/image_util/pidi/__init__.py

@@ -11,6 +11,7 @@
 
 from invokeai.backend.image_util.pidi.model import PiDiNet, pidinet
 from invokeai.backend.image_util.util import nms, normalize_image_channel_count, np_to_pil, pil_to_np, safe_step
+from invokeai.backend.model_manager.load.model_cache.utils import get_effective_device
 
 
 class PIDINetDetector:
@@ -45,7 +46,7 @@ def run(
     ) -> Image.Image:
         """Processes an image and returns the detected edges."""
 
-        device = next(iter(self.model.parameters())).device
+        device = get_effective_device(self.model)
 
         np_img = pil_to_np(image)
         np_img = normalize_image_channel_count(np_img)

invokeai/backend/model_manager/load/model_cache/utils.py

@@ -0,0 +1,20 @@
+import itertools
+
+import torch
+
+
+def get_effective_device(model: torch.nn.Module) -> torch.device:
+    """A utility to infer the 'effective' device of a model.
+
+    This utility handles the case where a model is partially loaded onto the GPU, so is safer than just calling:
+    `next(iter(model.parameters())).device`.
+
+    In the worst case, this utility has to check all model parameters, so if you already know the intended model device,
+    then it is better to avoid calling this function.
+    """
+    # If all parameters are on the CPU, return the CPU device. Otherwise, return the first non-CPU device.
+    for p in itertools.chain(model.parameters(), model.buffers()):
+        if p.device.type != "cpu":
+            return p.device
+
+    return torch.device("cpu")