DDUF parser v0.1

docs/source/en/package_reference/serialization.md

@@ -6,6 +6,116 @@ rendered properly in your Markdown viewer.
 
 `huggingface_hub` contains helpers to help ML libraries serialize models weights in a standardized way. This part of the lib is still under development and will be improved in future releases. The goal is to harmonize how weights are serialized on the Hub, both to remove code duplication across libraries and to foster conventions on the Hub.
 
+## DDUF file format
+
+DDUF is a file format designed for diffusers models. It allows saving all the information to run a model in a single file. This work is inspired by the GGUF format. `huggingface_hub` provides helpers to save and load DDUF files, ensuring the file format is respected.
+
+<Tip warning={true}>
+
+This is a very early version of the parser. The API and implementation can evolve in the near future.
+
+The parser currently does very little validation. For more details about the file format, check out https://github.com/huggingface/huggingface.js/tree/main/packages/dduf.
+
+</Tip>
+
+### How to write a DDUF file?
+
+Here is how to export a folder containing different parts of a diffusion model using [`export_folder_as_dduf`]:
+
+```python
+# Export a folder as a DDUF file
+>>> from huggingface_hub import export_folder_as_dduf
+>>> export_folder_as_dduf("FLUX.1-dev.dduf", folder_path="path/to/FLUX.1-dev")
+```
+
+For more flexibility, to can use [`export_entries_as_dduf`] and pass a list of files to include in the final DDUF file:
+
+```python
+# Export specific files from the local disk.
+>>> from huggingface_hub import export_entries_as_dduf
+>>> export_entries_as_dduf(
+...     "stable-diffusion-v1-4-FP16.dduf",
+...     entries=[ # List entries to add to the DDUF file (here, only FP16 weights)
+...         ("model_index.json", "path/to/model_index.json"),
+...         ("vae/config.json", "path/to/vae/config.json"),
+...         ("vae/diffusion_pytorch_model.fp16.safetensors", "path/to/vae/diffusion_pytorch_model.fp16.safetensors"),
+...         ("text_encoder/config.json", "path/to/text_encoder/config.json"),
+...         ("text_encoder/model.fp16.safetensors", "path/to/text_encoder/model.fp16.safetensors"),
+...         # ... add more entries here
+...     ]
+... )
+```
+
+The `entries` parameter also support passing an iterable of paths or bytes. This can prove useful if you have a loaded model and want to serialize it directly in a DDUF file instead of having to serialize each component to disk first and then as a DDUF file. Here is an example on how a `StableDiffusionPipeline` can be serialized as DDUF:
+
+
+```python
+# Export state_dicts one by one from a loaded pipeline 
+>>> from diffusers import DiffusionPipeline
+>>> from typing import Generator, Tuple
+>>> import safetensors.torch
+>>> from huggingface_hub import export_entries_as_dduf
+>>> pipe = DiffusionPipeline.from_pretrained("CompVis/stable-diffusion-v1-4")
+... # ... do some work with the pipeline
+
+>>> def as_entries(pipe: DiffusionPipeline) -> Generator[Tuple[str, bytes], None, None]:
+...     # Build an generator that yields the entries to add to the DDUF file.
+...     # The first element of the tuple is the filename in the DDUF archive (must use UNIX separator!). The second element is the content of the file.
+...     # Entries will be evaluated lazily when the DDUF file is created (only 1 entry is loaded in memory at a time)
+...     yield "vae/config.json", pipe.vae.to_json_string().encode()
+...     yield "vae/diffusion_pytorch_model.safetensors", safetensors.torch.save(pipe.vae.state_dict())
+...     yield "text_encoder/config.json", pipe.text_encoder.config.to_json_string().encode()
+...     yield "text_encoder/model.safetensors", safetensors.torch.save(pipe.text_encoder.state_dict())
+...     # ... add more entries here
+
+>>> export_entries_as_dduf("stable-diffusion-v1-4.dduf", entries=as_entries(pipe))
+```
+
+**Note:** in practice, `diffusers` provides a method to directly serialize a pipeline in a DDUF file. The snippet above is only meant as an example.
+
+### How to read a DDUF file?
+
+```python
+>>> import json
+>>> import safetensors.load
+>>> from huggingface_hub import read_dduf_file
+
+# Read DDUF metadata
+>>> dduf_entries = read_dduf_file("FLUX.1-dev.dduf")
+
+# Returns a mapping filename <> DDUFEntry
+>>> dduf_entries["model_index.json"]
+DDUFEntry(filename='model_index.json', offset=66, length=587)
+
+# Load model index as JSON
+>>> json.loads(dduf_entries["model_index.json"].read_text())
+{'_class_name': 'FluxPipeline', '_diffusers_version': '0.32.0.dev0', '_name_or_path': 'black-forest-labs/FLUX.1-dev', 'scheduler': ['diffusers', 'FlowMatchEulerDiscreteScheduler'], 'text_encoder': ['transformers', 'CLIPTextModel'], 'text_encoder_2': ['transformers', 'T5EncoderModel'], 'tokenizer': ['transformers', 'CLIPTokenizer'], 'tokenizer_2': ['transformers', 'T5TokenizerFast'], 'transformer': ['diffusers', 'FluxTransformer2DModel'], 'vae': ['diffusers', 'AutoencoderKL']}
+
+# Load VAE weights using safetensors
+>>> with dduf_entries["vae/diffusion_pytorch_model.safetensors"].as_mmap() as mm:
+...     state_dict = safetensors.torch.load(mm)
+```
+
+### Helpers
+
+[[autodoc]] huggingface_hub.export_entries_as_dduf
+
+[[autodoc]] huggingface_hub.export_folder_as_dduf
+
+[[autodoc]] huggingface_hub.read_dduf_file
+
+[[autodoc]] huggingface_hub.DDUFEntry
+
+### Errors
+
+[[autodoc]] huggingface_hub.errors.DDUFError
+
+[[autodoc]] huggingface_hub.errors.DDUFCorruptedFileError
+
+[[autodoc]] huggingface_hub.errors.DDUFExportError
+
+[[autodoc]] huggingface_hub.errors.DDUFInvalidEntryNameError
+
 ## Save torch state dict
 
 The main helper of the `serialization` module takes a torch `nn.Module` as input and saves it to disk. It handles the logic to save shared tensors (see [safetensors explanation](https://huggingface.co/docs/safetensors/torch_shared_tensors)) as well as logic to split the state dictionary into shards, using [`split_torch_state_dict_into_shards`] under the hood. At the moment, only `torch` framework is supported.

src/huggingface_hub/__init__.py

@@ -467,6 +467,12 @@
         "split_tf_state_dict_into_shards",
         "split_torch_state_dict_into_shards",
     ],
+    "serialization._dduf": [
+        "DDUFEntry",
+        "export_entries_as_dduf",
+        "export_folder_as_dduf",
+        "read_dduf_file",
+    ],
     "utils": [
         "CacheNotFound",
         "CachedFileInfo",
@@ -993,6 +999,12 @@ def __dir__():
         split_tf_state_dict_into_shards,  # noqa: F401
         split_torch_state_dict_into_shards,  # noqa: F401
     )
+    from .serialization._dduf import (
+        DDUFEntry,  # noqa: F401
+        export_entries_as_dduf,  # noqa: F401
+        export_folder_as_dduf,  # noqa: F401
+        read_dduf_file,  # noqa: F401
+    )
     from .utils import (
         CachedFileInfo,  # noqa: F401
         CachedRepoInfo,  # noqa: F401

src/huggingface_hub/errors.py

@@ -308,3 +308,22 @@ class BadRequestError(HfHubHTTPError, ValueError):
     huggingface_hub.utils._errors.BadRequestError: Bad request for check endpoint: {details} (Request ID: XXX)
     ```
     """
+
+
+# DDUF file format ERROR
+
+
+class DDUFError(Exception):
+    """Base exception for errors related to the DDUF format."""
+
+
+class DDUFCorruptedFileError(DDUFError):
+    """Exception thrown when the DDUF file is corrupted."""
+
+
+class DDUFExportError(DDUFError):
+    """Base exception for errors during DDUF export."""
+
+
+class DDUFInvalidEntryNameError(DDUFExportError):
+    """Exception thrown when the entry name is invalid."""