feat(api): backend support for multiple GPUs in diffusion pipelines

api/onnx_web/pipeline.py

@@ -6,7 +6,7 @@ from diffusers import (
     OnnxStableDiffusionInpaintPipeline,
 )
 from PIL import Image, ImageChops
-from typing import Any
+from typing import Any, Union
 
 import gc
 import numpy as np
@@ -44,7 +44,7 @@ def get_latents_from_seed(seed: int, size: Size) -> np.ndarray:
     return image_latents
 
 
-def load_pipeline(pipeline: DiffusionPipeline, model: str, provider: str, scheduler: Any):
+def load_pipeline(pipeline: DiffusionPipeline, model: str, provider: str, scheduler: Any, device: Union[str, None]):
     global last_pipeline_instance
     global last_pipeline_scheduler
     global last_pipeline_options
@@ -61,14 +61,23 @@ def load_pipeline(pipeline: DiffusionPipeline, model: str, provider: str, schedu
             safety_checker=None,
             scheduler=scheduler.from_pretrained(model, subfolder='scheduler')
         )
+
+        if device is not None:
+            pipe = pipe.to(device)
+
         last_pipeline_instance = pipe
         last_pipeline_options = options
         last_pipeline_scheduler = scheduler
 
     if last_pipeline_scheduler != scheduler:
         print('changing pipeline scheduler')
-        pipe.scheduler = scheduler.from_pretrained(
+        scheduler = scheduler.from_pretrained(
             model, subfolder='scheduler')
+
+        if device is not None:
+            scheduler = scheduler.to(device)
+
+        pipe.scheduler = scheduler
         last_pipeline_scheduler = scheduler
 
     print('running garbage collection during pipeline change')