feat(runner): add support for SD3-medium model

This commit introduces support for the Stable Diffusion 3 Medium model
from Hugging Face:
[https://huggingface.co/stabilityai/stable-diffusion-3-medium](https://huggingface.co/stabilityai/stable-diffusion-3-medium).

Please be aware that this model has restrictive licensing at the time of
writing and is not yet advised for public use. Ensure you read and
understand the [licensing
terms](https://huggingface.co/stabilityai/stable-diffusion-3-medium/blob/main/LICENSE)
before enabling this model on your orchestrator.

runner/app/pipelines/text_to_image.py

@@ -1,6 +1,7 @@
 import logging
 import os
 from typing import List, Tuple, Optional
+from enum import Enum
 
 import PIL
 import torch
@@ -9,6 +10,7 @@
     EulerDiscreteScheduler,
     StableDiffusionXLPipeline,
     UNet2DConditionModel,
+    StableDiffusion3Pipeline,
 )
 from huggingface_hub import file_download, hf_hub_download
 from safetensors.torch import load_file
@@ -24,7 +26,17 @@
 
 logger = logging.getLogger(__name__)
 
-SDXL_LIGHTNING_MODEL_ID = "ByteDance/SDXL-Lightning"
+
+class ModelName(Enum):
+    """Enumeration mapping model names to their corresponding IDs."""
+
+    SDXL_LIGHTNING = "ByteDance/SDXL-Lightning"
+    SD3_MEDIUM = "stabilityai/stable-diffusion-3-medium-diffusers"
+
+    @classmethod
+    def list(cls):
+        """Return a list of all model IDs."""
+        return list(map(lambda c: c.value, cls))
 
 
 class TextToImagePipeline(Pipeline):
@@ -46,7 +58,7 @@ def __init__(self, model_id: str):
                 for _, _, files in os.walk(folder_path)
                 for fname in files
             )
-            or SDXL_LIGHTNING_MODEL_ID in model_id
+            or ModelName.SDXL_LIGHTNING.value in model_id
         )
         if torch_device != "cpu" and has_fp16_variant:
             logger.info("TextToImagePipeline loading fp16 variant for %s", model_id)
@@ -59,7 +71,7 @@ def __init__(self, model_id: str):
             kwargs["torch_dtype"] = torch.bfloat16
 
         # Special case SDXL-Lightning because the unet for SDXL needs to be swapped
-        if SDXL_LIGHTNING_MODEL_ID in model_id:
+        if ModelName.SDXL_LIGHTNING.value in model_id:
             base = "stabilityai/stable-diffusion-xl-base-1.0"
 
             # ByteDance/SDXL-Lightning-2step
@@ -81,7 +93,7 @@ def __init__(self, model_id: str):
             unet.load_state_dict(
                 load_file(
                     hf_hub_download(
-                        SDXL_LIGHTNING_MODEL_ID,
+                        ModelName.SDXL_LIGHTNING.value,
                         f"{unet_id}.safetensors",
                         cache_dir=kwargs["cache_dir"],
                     ),
@@ -96,6 +108,10 @@ def __init__(self, model_id: str):
             self.ldm.scheduler = EulerDiscreteScheduler.from_config(
                 self.ldm.scheduler.config, timestep_spacing="trailing"
             )
+        elif ModelName.SD3_MEDIUM.value in model_id:
+            self.ldm = StableDiffusion3Pipeline.from_pretrained(model_id, **kwargs).to(
+                torch_device
+            )
         else:
             self.ldm = AutoPipelineForText2Image.from_pretrained(model_id, **kwargs).to(
                 torch_device
@@ -190,7 +206,7 @@ def __call__(
             # SD turbo models were trained without guidance_scale so
             # it should be set to 0
             kwargs["guidance_scale"] = 0.0
-        elif SDXL_LIGHTNING_MODEL_ID in self.model_id:
+        elif ModelName.SDXL_LIGHTNING.value in self.model_id:
             # SDXL-Lightning models should have guidance_scale = 0 and use
             # the correct number of inference steps for the unet checkpoint loaded
             kwargs["guidance_scale"] = 0.0

runner/app/routes/text_to_image.py

@@ -68,7 +68,8 @@ async def text_to_image(
     for seed in seeds:
         try:
             params.seed = seed
-            imgs, nsfw_check = pipeline(**params.model_dump())
+            kwargs = {k: v for k,v in params.model_dump().items() if k != "model_id"}
+            imgs, nsfw_check = pipeline(**kwargs)
             images.extend(imgs)
             has_nsfw_concept.extend(nsfw_check)
         except Exception as e:

runner/dl_checkpoints.sh

@@ -52,6 +52,7 @@ function download_all_models() {
     huggingface-cli download stabilityai/stable-diffusion-xl-base-1.0 --include "*.fp16.safetensors" "*.json" "*.txt" --exclude ".onnx" ".onnx_data" --cache-dir models
     huggingface-cli download prompthero/openjourney-v4 --include "*.safetensors" "*.json" "*.txt" --exclude ".onnx" ".onnx_data" --cache-dir models
     huggingface-cli download SG161222/RealVisXL_V4.0 --include "*.fp16.safetensors" "*.json" "*.txt" --exclude ".onnx" ".onnx_data" --cache-dir models
+    huggingface-cli download stabilityai/stable-diffusion-3-medium-diffusers --include "*.fp16*.safetensors" "*.model" "*.json" "*.txt" --cache-dir models ${TOKEN_FLAG:+"$TOKEN_FLAG"}
 
     # Download image-to-video models.
     huggingface-cli download stabilityai/stable-video-diffusion-img2vid-xt --include "*.fp16.safetensors" "*.json" --cache-dir models

runner/requirements.txt

@@ -1,4 +1,4 @@
-diffusers==0.28.0
+diffusers==0.29.2
 accelerate==0.30.1
 transformers==4.41.1
 fastapi==0.111.0
@@ -14,3 +14,5 @@ deepcache==0.1.1
 safetensors==0.4.3
 scipy==1.13.0
 numpy==1.26.4
+sentencepiece== 0.2.0
+protobuf==5.27.2