feat: add lumina2 accessory pipeline

Author: syunar

docs/source/en/api/models/lumina2_accessory_transformer2d.md

@@ -0,0 +1,31 @@
+<!-- Copyright 2025 The HuggingFace Team. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License. -->
+
+# Lumina2AccessoryTransformer2DModel
+
+A Diffusion Transformer model for 2D data from [Lumina-Accessory](https://github.com/Alpha-VLLM/Lumina-Accessory). by Alpha-VLLM.
+
+The model can be loaded with the following code snippet.
+
+```python
+from diffusers import Lumina2AccessoryTransformer2DModel
+
+ckpt_path = "https://huggingface.co/Alpha-VLLM/Lumina-Accessory/blob/main/consolidated.00-of-01.pth"
+transformer = Lumina2AccessoryTransformer2DModel.from_single_file(ckpt_path, torch_dtype=torch.bfloat16)
+```
+
+## Lumina2AccessoryTransformer2DModel
+
+[[autodoc]] Lumina2AccessoryTransformer2DModel
+
+## Transformer2DModelOutput
+
+[[autodoc]] models.modeling_outputs.Transformer2DModelOutput

docs/source/en/api/pipelines/lumina2.md

@@ -80,8 +80,53 @@ image = pipe(
 image.save("lumina-gguf.png")
 ```
 
+## Lumina Accessory
+
+Lumina-Accessory is a multi-task instruction fine-tuning framework designed for the Lumina series. The official repository is from [Alpha-VLLM/Lumina-Accessory](https://github.com/Alpha-VLLM/Lumina-Accessory)
+
+```python
+import torch
+from diffusers import Lumina2AccessoryPipeline, Lumina2AccessoryTransformer2DModel
+from diffusers.utils import load_image
+
+ckpt_path = "https://huggingface.co/Alpha-VLLM/Lumina-Accessory/blob/main/consolidated.00-of-01.pth"
+transformer = Lumina2AccessoryTransformer2DModel.from_single_file(ckpt_path, torch_dtype=torch.bfloat16)
+pipe = Lumina2AccessoryPipeline.from_pretrained(
+    "Alpha-VLLM/Lumina-Image-2.0", transformer=transformer, torch_dtype=torch.bfloat16
+    )
+
+# Enable memory optimizations.
+pipe.enable_model_cpu_offload()
+
+img = load_image("https://github.com/Alpha-VLLM/Lumina-Accessory/blob/main/examples/case_1_condition.jpg?raw=true")
+prompt = "A classical oil painting of a young woman dressed in a modern DARK BLACK leather jacket."
+system_prompt = "You are an assistant designed to generate superior images with the highest degree of image-text alignment based on textual prompts and a partially masked image."
+image = pipe(
+        image=img,
+        prompt=prompt,
+        system_prompt=system_prompt,
+        width=img.size[0],
+        height=img.size[1],
+        negative_prompt=" ",
+        num_inference_steps=25,
+        num_images_per_prompt=1,
+        guidance_scale=4.0,
+        cfg_trunc_ratio=1.0,
+        cfg_normalization=True,
+        generator=torch.Generator().manual_seed(42),
+    ).images[0]
+image.save("lumina2_accessory_image_infliling.png")
+```
+
 ## Lumina2Pipeline
 
 [[autodoc]] Lumina2Pipeline
   - all
   - __call__
+
+
+## Lumina2AccessoryPipeline
+
+[[autodoc]] Lumina2AccessoryPipeline
+  - all
+  - __call__

src/diffusers/__init__.py

@@ -221,6 +221,7 @@
             "Kandinsky3UNet",
             "LatteTransformer3DModel",
             "LTXVideoTransformer3DModel",
+            "Lumina2AccessoryTransformer2DModel",
             "Lumina2Transformer2DModel",
             "LuminaNextDiT2DModel",
             "MochiTransformer3DModel",
@@ -496,6 +497,7 @@
             "LTXLatentUpsamplePipeline",
             "LTXPipeline",
             "LucyEditPipeline",
+            "Lumina2AccessoryPipeline",
             "Lumina2Pipeline",
             "Lumina2Text2ImgPipeline",
             "LuminaPipeline",
@@ -906,6 +908,7 @@
             Kandinsky3UNet,
             LatteTransformer3DModel,
             LTXVideoTransformer3DModel,
+            Lumina2AccessoryTransformer2DModel,
             Lumina2Transformer2DModel,
             LuminaNextDiT2DModel,
             MochiTransformer3DModel,
@@ -1151,6 +1154,7 @@
             LTXLatentUpsamplePipeline,
             LTXPipeline,
             LucyEditPipeline,
+            Lumina2AccessoryPipeline,
             Lumina2Pipeline,
             Lumina2Text2ImgPipeline,
             LuminaPipeline,

src/diffusers/loaders/single_file_model.py

@@ -134,6 +134,10 @@
         "checkpoint_mapping_fn": convert_lumina2_to_diffusers,
         "default_subfolder": "transformer",
     },
+    "Lumina2AccessoryTransformer2DModel": {
+        "checkpoint_mapping_fn": convert_lumina2_to_diffusers,
+        "default_subfolder": "transformer",
+    },
     "SanaTransformer2DModel": {
         "checkpoint_mapping_fn": convert_sana_transformer_to_diffusers,
         "default_subfolder": "transformer",

src/diffusers/models/__init__.py

@@ -92,6 +92,7 @@
     _import_structure["transformers.transformer_hunyuan_video_framepack"] = ["HunyuanVideoFramepackTransformer3DModel"]
     _import_structure["transformers.transformer_ltx"] = ["LTXVideoTransformer3DModel"]
     _import_structure["transformers.transformer_lumina2"] = ["Lumina2Transformer2DModel"]
+    _import_structure["transformers.transformer_lumina2_accessory"] = ["Lumina2AccessoryTransformer2DModel"]
     _import_structure["transformers.transformer_mochi"] = ["MochiTransformer3DModel"]
     _import_structure["transformers.transformer_omnigen"] = ["OmniGenTransformer2DModel"]
     _import_structure["transformers.transformer_qwenimage"] = ["QwenImageTransformer2DModel"]
@@ -182,6 +183,7 @@
             HunyuanVideoTransformer3DModel,
             LatteTransformer3DModel,
             LTXVideoTransformer3DModel,
+            Lumina2AccessoryTransformer2DModel,
             Lumina2Transformer2DModel,
             LuminaNextDiT2DModel,
             MochiTransformer3DModel,

src/diffusers/models/transformers/__init__.py

@@ -29,6 +29,7 @@
     from .transformer_hunyuan_video_framepack import HunyuanVideoFramepackTransformer3DModel
     from .transformer_ltx import LTXVideoTransformer3DModel
     from .transformer_lumina2 import Lumina2Transformer2DModel
+    from .transformer_lumina2_accessory import Lumina2AccessoryTransformer2DModel
     from .transformer_mochi import MochiTransformer3DModel
     from .transformer_omnigen import OmniGenTransformer2DModel
     from .transformer_qwenimage import QwenImageTransformer2DModel