[Single File] Add GGUF support

.github/workflows/nightly_tests.yml

@@ -357,6 +357,8 @@ jobs:
         config:
           - backend: "bitsandbytes"
             test_location: "bnb"
+          - backend: "gguf"
+            test_location: "gguf"
     runs-on:
       group: aws-g6e-xlarge-plus
     container:

docs/source/en/_toctree.yml

@@ -157,6 +157,8 @@
     title: Getting Started
   - local: quantization/bitsandbytes
     title: bitsandbytes
+  - local: quantization/gguf
+    title: gguf
   - local: quantization/torchao
     title: torchao
   title: Quantization Methods

docs/source/en/api/quantization.md

@@ -28,6 +28,9 @@ Learn how to quantize models in the [Quantization](../quantization/overview) gui
 
 [[autodoc]] BitsAndBytesConfig
 
+## GGUFQuantizationConfig
+
+[[autodoc]] GGUFQuantizationConfig
 ## TorchAoConfig
 
 [[autodoc]] TorchAoConfig

docs/source/en/quantization/gguf.md

@@ -0,0 +1,70 @@
+<!--Copyright 2024 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.
+
+-->
+
+# GGUF
+
+The GGUF file format is typically used to store models for inference with [GGML](https://github.com/ggerganov/ggml) and supports a variety of block wise quantization options. Diffusers supports loading checkpoints prequantized and saved in the GGUF format via `from_single_file` loading with Model classes. Loading GGUF checkpoints via Pipelines is currently not supported.
+
+The following example will load the [FLUX.1 DEV](https://huggingface.co/black-forest-labs/FLUX.1-dev) transformer model using the GGUF Q2_K quantization variant.
+
+Before starting please install gguf in your environment
+
+```shell
+pip install -U gguf
+```
+
+Since GGUF is a single file format, use [`~FromSingleFileMixin.from_single_file`] to load the model and pass in the [`GGUFQuantizationConfig`].
+
+When using GGUF checkpoints, the quantized weights remain in a low memory `dtype`(typically `torch.unint8`) and are dynamically dequantized and cast to the configured `compute_dtype` during each module's forward pass through the model. The `GGUFQuantizationConfig` allows you to set the `compute_dtype`. 
+
+The functions used for dynamic dequantizatation are based on the great work done by [city96](https://github.com/city96/ComfyUI-GGUF), who created the Pytorch ports of the original (`numpy`)[https://github.com/ggerganov/llama.cpp/blob/master/gguf-py/gguf/quants.py] implementation by [compilade](https://github.com/compilade).
+
+```python
+import torch
+
+from diffusers import FluxPipeline, FluxTransformer2DModel, GGUFQuantizationConfig
+
+ckpt_path = (
+    "https://huggingface.co/city96/FLUX.1-dev-gguf/blob/main/flux1-dev-Q2_K.gguf"
+)
+transformer = FluxTransformer2DModel.from_single_file(
+    ckpt_path,
+    quantization_config=GGUFQuantizationConfig(compute_dtype=torch.bfloat16),
+    torch_dtype=torch.bfloat16,
+)
+pipe = FluxPipeline.from_pretrained(
+    "black-forest-labs/FLUX.1-dev",
+    transformer=transformer,
+    generator=torch.manual_seed(0),
+    torch_dtype=torch.bfloat16,
+)
+pipe.enable_model_cpu_offload()
+prompt = "A cat holding a sign that says hello world"
+image = pipe(prompt).images[0]
+image.save("flux-gguf.png")
+```
+
+## Supported Quantization Types
+
+- BF16
+- Q4_0
+- Q4_1
+- Q5_0
+- Q5_1
+- Q8_0
+- Q2_K
+- Q3_K
+- Q4_K
+- Q5_K
+- Q6_K
+

docs/source/en/quantization/overview.md

@@ -17,7 +17,7 @@ Quantization techniques focus on representing data with less information while a
 
 <Tip>
 
-Interested in adding a new quantization method to Transformers? Refer to the [Contribute new quantization method guide](https://huggingface.co/docs/transformers/main/en/quantization/contribute) to learn more about adding a new quantization method.
+Interested in adding a new quantization method to Diffusers? Refer to the [Contribute new quantization method guide](https://huggingface.co/docs/transformers/main/en/quantization/contribute) to learn more about adding a new quantization method.
 
 </Tip>
 
@@ -32,4 +32,9 @@ If you are new to the quantization field, we recommend you to check out these be
 
 ## When to use what?
 
-Diffusers supports [bitsandbytes](https://huggingface.co/docs/bitsandbytes/main/en/index) and [torchao](https://github.com/pytorch/ao). Refer to this [table](https://huggingface.co/docs/transformers/main/en/quantization/overview#when-to-use-what) to help you determine which quantization backend to use.
+Diffusers currently supports the following quantization methods.
+- [BitsandBytes]()
+- [TorchAO]()
+- [GGUF]()
+
+[This resource](https://huggingface.co/docs/transformers/main/en/quantization/overview#when-to-use-what) provides a good overview of the pros and cons of different quantization techniques.

src/diffusers/__init__.py

@@ -31,7 +31,7 @@
     "loaders": ["FromOriginalModelMixin"],
     "models": [],
     "pipelines": [],
-    "quantizers.quantization_config": ["BitsAndBytesConfig", "TorchAoConfig"],
+    "quantizers.quantization_config": ["BitsAndBytesConfig", "GGUFQuantizationConfig", "TorchAoConfig"],
     "schedulers": [],
     "utils": [
         "OptionalDependencyNotAvailable",
@@ -569,7 +569,7 @@
 
 if TYPE_CHECKING or DIFFUSERS_SLOW_IMPORT:
     from .configuration_utils import ConfigMixin
-    from .quantizers.quantization_config import BitsAndBytesConfig, TorchAoConfig
+    from .quantizers.quantization_config import BitsAndBytesConfig, GGUFQuantizationConfig, TorchAoConfig
 
     try:
         if not is_onnx_available():

src/diffusers/loaders/single_file_model.py

@@ -17,8 +17,10 @@
 from contextlib import nullcontext
 from typing import Optional
 
+import torch
 from huggingface_hub.utils import validate_hf_hub_args
 
+from ..quantizers import DiffusersAutoQuantizer
 from ..utils import deprecate, is_accelerate_available, logging
 from .single_file_utils import (
     SingleFileComponentError,
@@ -214,6 +216,8 @@ def from_single_file(cls, pretrained_model_link_or_path_or_dict: Optional[str] =
         subfolder = kwargs.pop("subfolder", None)
         revision = kwargs.pop("revision", None)
         torch_dtype = kwargs.pop("torch_dtype", None)
+        quantization_config = kwargs.pop("quantization_config", None)
+        device = kwargs.pop("device", None)
 
         if isinstance(pretrained_model_link_or_path_or_dict, dict):
             checkpoint = pretrained_model_link_or_path_or_dict
@@ -227,6 +231,12 @@ def from_single_file(cls, pretrained_model_link_or_path_or_dict: Optional[str] =
                 local_files_only=local_files_only,
                 revision=revision,
             )
+        if quantization_config is not None:
+            hf_quantizer = DiffusersAutoQuantizer.from_config(quantization_config)
+            hf_quantizer.validate_environment()
+
+        else:
+            hf_quantizer = None
 
         mapping_functions = SINGLE_FILE_LOADABLE_CLASSES[mapping_class_name]
 
@@ -309,8 +319,36 @@ def from_single_file(cls, pretrained_model_link_or_path_or_dict: Optional[str] =
         with ctx():
             model = cls.from_config(diffusers_model_config)
 
+        # Check if `_keep_in_fp32_modules` is not None
+        use_keep_in_fp32_modules = (cls._keep_in_fp32_modules is not None) and (
+            (torch_dtype == torch.float16) or hasattr(hf_quantizer, "use_keep_in_fp32_modules")
+        )
+        if use_keep_in_fp32_modules:
+            keep_in_fp32_modules = cls._keep_in_fp32_modules
+            if not isinstance(keep_in_fp32_modules, list):
+                keep_in_fp32_modules = [keep_in_fp32_modules]
+
+        else:
+            keep_in_fp32_modules = []
+
+        if hf_quantizer is not None:
+            hf_quantizer.preprocess_model(
+                model=model,
+                device_map=None,
+                state_dict=diffusers_format_checkpoint,
+                keep_in_fp32_modules=keep_in_fp32_modules,
+            )
+
         if is_accelerate_available():
-            unexpected_keys = load_model_dict_into_meta(model, diffusers_format_checkpoint, dtype=torch_dtype)
+            param_device = torch.device(device) if device else torch.device("cpu")
+            unexpected_keys = load_model_dict_into_meta(
+                model,
+                diffusers_format_checkpoint,
+                dtype=torch_dtype,
+                device=param_device,
+                hf_quantizer=hf_quantizer,
+                keep_in_fp32_modules=keep_in_fp32_modules,
+            )
 
         else:
             _, unexpected_keys = model.load_state_dict(diffusers_format_checkpoint, strict=False)
@@ -324,7 +362,11 @@ def from_single_file(cls, pretrained_model_link_or_path_or_dict: Optional[str] =
                 f"Some weights of the model checkpoint were not used when initializing {cls.__name__}: \n {[', '.join(unexpected_keys)]}"
             )
 
-        if torch_dtype is not None:
+        if hf_quantizer is not None:
+            hf_quantizer.postprocess_model(model)
+            model.hf_quantizer = hf_quantizer
+
+        if torch_dtype is not None and hf_quantizer is None:
             model.to(torch_dtype)
 
         model.eval()

src/diffusers/loaders/single_file_utils.py

@@ -81,8 +81,14 @@
     "open_clip_sd3": "text_encoders.clip_g.transformer.text_model.embeddings.position_embedding.weight",
     "stable_cascade_stage_b": "down_blocks.1.0.channelwise.0.weight",
     "stable_cascade_stage_c": "clip_txt_mapper.weight",
-    "sd3": "model.diffusion_model.joint_blocks.0.context_block.adaLN_modulation.1.bias",
-    "sd35_large": "model.diffusion_model.joint_blocks.37.x_block.mlp.fc1.weight",
+    "sd3": [
+        "joint_blocks.0.context_block.adaLN_modulation.1.bias",
+        "model.diffusion_model.joint_blocks.0.context_block.adaLN_modulation.1.bias",
+    ],
+    "sd35_large": [
+        "joint_blocks.37.x_block.mlp.fc1.weight",
+        "model.diffusion_model.joint_blocks.37.x_block.mlp.fc1.weight",
+    ],
     "animatediff": "down_blocks.0.motion_modules.0.temporal_transformer.transformer_blocks.0.attention_blocks.0.pos_encoder.pe",
     "animatediff_v2": "mid_block.motion_modules.0.temporal_transformer.norm.bias",
     "animatediff_sdxl_beta": "up_blocks.2.motion_modules.0.temporal_transformer.norm.weight",
@@ -542,13 +548,20 @@ def infer_diffusers_model_type(checkpoint):
     ):
         model_type = "stable_cascade_stage_b"
 
-    elif CHECKPOINT_KEY_NAMES["sd3"] in checkpoint and checkpoint[CHECKPOINT_KEY_NAMES["sd3"]].shape[-1] == 9216:
-        if checkpoint["model.diffusion_model.pos_embed"].shape[1] == 36864:
+    elif any(key in checkpoint for key in CHECKPOINT_KEY_NAMES["sd3"]) and any(
+        checkpoint[key].shape[-1] == 9216 if key in checkpoint else False for key in CHECKPOINT_KEY_NAMES["sd3"]
+    ):
+        if "model.diffusion_model.pos_embed" in checkpoint:
+            key = "model.diffusion_model.pos_embed"
+        else:
+            key = "pos_embed"
+
+        if checkpoint[key].shape[1] == 36864:
             model_type = "sd3"
-        elif checkpoint["model.diffusion_model.pos_embed"].shape[1] == 147456:
+        elif checkpoint[key].shape[1] == 147456:
             model_type = "sd35_medium"
 
-    elif CHECKPOINT_KEY_NAMES["sd35_large"] in checkpoint:
+    elif any(key in checkpoint for key in CHECKPOINT_KEY_NAMES["sd35_large"]):
         model_type = "sd35_large"
 
     elif CHECKPOINT_KEY_NAMES["animatediff"] in checkpoint:

src/diffusers/models/model_loading_utils.py

@@ -17,6 +17,7 @@
 import importlib
 import inspect
 import os
+from array import array
 from collections import OrderedDict
 from pathlib import Path
 from typing import List, Optional, Union
@@ -26,13 +27,16 @@
 from huggingface_hub.utils import EntryNotFoundError
 
 from ..utils import (
+    GGUF_FILE_EXTENSION,
     SAFE_WEIGHTS_INDEX_NAME,
     SAFETENSORS_FILE_EXTENSION,
     WEIGHTS_INDEX_NAME,
     _add_variant,
     _get_model_file,
     deprecate,
     is_accelerate_available,
+    is_gguf_available,
+    is_torch_available,
     is_torch_version,
     logging,
 )
@@ -139,6 +143,8 @@ def load_state_dict(checkpoint_file: Union[str, os.PathLike], variant: Optional[
         file_extension = os.path.basename(checkpoint_file).split(".")[-1]
         if file_extension == SAFETENSORS_FILE_EXTENSION:
             return safetensors.torch.load_file(checkpoint_file, device="cpu")
+        elif file_extension == GGUF_FILE_EXTENSION:
+            return load_gguf_checkpoint(checkpoint_file)
         else:
             weights_only_kwarg = {"weights_only": True} if is_torch_version(">=", "1.13") else {}
             return torch.load(
@@ -211,13 +217,14 @@ def load_model_dict_into_meta(
                     set_module_kwargs["dtype"] = dtype
 
         # bnb params are flattened.
+        # gguf quants have a different shape based on the type of quantization applied
         if empty_state_dict[param_name].shape != param.shape:
             if (
                 is_quantized
                 and hf_quantizer.pre_quantized
                 and hf_quantizer.check_if_quantized_param(model, param, param_name, state_dict, param_device=device)
             ):
-                hf_quantizer.check_quantized_param_shape(param_name, empty_state_dict[param_name].shape, param.shape)
+                hf_quantizer.check_quantized_param_shape(param_name, empty_state_dict[param_name], param)
             else:
                 model_name_or_path_str = f"{model_name_or_path} " if model_name_or_path is not None else ""
                 raise ValueError(
@@ -396,3 +403,78 @@ def _fetch_index_file_legacy(
                 index_file = None
 
     return index_file
+
+
+def _gguf_parse_value(_value, data_type):
+    if not isinstance(data_type, list):
+        data_type = [data_type]
+    if len(data_type) == 1:
+        data_type = data_type[0]
+        array_data_type = None
+    else:
+        if data_type[0] != 9:
+            raise ValueError("Received multiple types, therefore expected the first type to indicate an array.")
+        data_type, array_data_type = data_type
+
+    if data_type in [0, 1, 2, 3, 4, 5, 10, 11]:
+        _value = int(_value[0])
+    elif data_type in [6, 12]:
+        _value = float(_value[0])
+    elif data_type in [7]:
+        _value = bool(_value[0])
+    elif data_type in [8]:
+        _value = array("B", list(_value)).tobytes().decode()
+    elif data_type in [9]:
+        _value = _gguf_parse_value(_value, array_data_type)
+    return _value
+
+
+def load_gguf_checkpoint(gguf_checkpoint_path, return_tensors=False):
+    """
+    Load a GGUF file and return a dictionary of parsed parameters containing tensors, the parsed tokenizer and config
+    attributes.
+
+    Args:
+        gguf_checkpoint_path (`str`):
+            The path the to GGUF file to load
+        return_tensors (`bool`, defaults to `True`):
+            Whether to read the tensors from the file and return them. Not doing so is faster and only loads the
+            metadata in memory.
+    """
+
+    if is_gguf_available() and is_torch_available():
+        import gguf
+        from gguf import GGUFReader
+
+        from ..quantizers.gguf.utils import SUPPORTED_GGUF_QUANT_TYPES, GGUFParameter
+    else:
+        logger.error(
+            "Loading a GGUF checkpoint in PyTorch, requires both PyTorch and GGUF>=0.10.0 to be installed. Please see "
+            "https://pytorch.org/ and https://github.com/ggerganov/llama.cpp/tree/master/gguf-py for installation instructions."
+        )
+        raise ImportError("Please install torch and gguf>=0.10.0 to load a GGUF checkpoint in PyTorch.")
+
+    reader = GGUFReader(gguf_checkpoint_path)
+
+    parsed_parameters = {}
+    for tensor in reader.tensors:
+        name = tensor.name
+        quant_type = tensor.tensor_type
+
+        # if the tensor is a torch supported dtype do not use GGUFParameter
+        is_gguf_quant = quant_type not in [gguf.GGMLQuantizationType.F32, gguf.GGMLQuantizationType.F16]
+        if is_gguf_quant and quant_type not in SUPPORTED_GGUF_QUANT_TYPES:
+            _supported_quants_str = "\n".join([str(type) for type in SUPPORTED_GGUF_QUANT_TYPES])
+            raise ValueError(
+                (
+                    f"{name} has a quantization type: {str(quant_type)} which is unsupported."
+                    "\n\nCurrently the following quantization types are supported: \n\n"
+                    f"{_supported_quants_str}"
+                    "\n\nTo request support for this quantization type please open an issue here: https://github.com/huggingface/diffusers"
+                )
+            )
+
+        weights = torch.from_numpy(tensor.data.copy())
+        parsed_parameters[name] = GGUFParameter(weights, quant_type=quant_type) if is_gguf_quant else weights
+
+    return parsed_parameters