#
Pipelines

Pipelines provide a simple way to run state-of-the-art diffusion models in inference by bundling all of the necessary components (multiple independently-trained models, schedulers, and processors) into a single end-to-end class. Pipelines are flexible and they can be adapted to use different schedulers or even model components.

All pipelines are built from the base DiffusionPipeline class which provides basic functionality for loading, downloading, and saving all the components. Specific pipeline types (for example StableDiffusionPipeline) loaded with from_pretrained() are automatically detected and the pipeline components are loaded and passed to the `__init__` function of the pipeline.

You shouldn’t use the DiffusionPipeline class for training. Individual components (for example, UNet2DModel and UNet2DConditionModel) of diffusion pipelines are usually trained individually, so we suggest directly working with them instead.

Pipelines do not offer any training functionality. You’ll notice PyTorch’s autograd is disabled by decorating the `__call__()` method with a `torch.no_grad` decorator because pipelines should not be used for training. If you’re interested in training, please take a look at the Training guides instead!

The table below lists all the pipelines currently available in 🤗 Diffusers and the tasks they support. Click on a pipeline to view its abstract and published paper.

Pipeline | Tasks
--- | ---
aMUSEd | text2image
AnimateDiff | text2video
Attend-and-Excite | text2image
AudioLDM | text2audio
AudioLDM2 | text2audio
AuraFlow | text2image
BLIP Diffusion | text2image
CogVideoX | text2video
Consistency Models | unconditional image generation
ControlNet | text2image, image2image, inpainting
ControlNet with Flux.1 | text2image
ControlNet with Hunyuan-DiT | text2image
ControlNet with Stable Diffusion 3 | text2image
ControlNet with Stable Diffusion XL | text2image
ControlNet-XS | text2image
ControlNet-XS with Stable Diffusion XL | text2image
Dance Diffusion | unconditional audio generation
DDIM | unconditional image generation
DDPM | unconditional image generation
DeepFloyd IF | text2image, image2image, inpainting, super-resolution
DiffEdit | inpainting
DiT | text2image
Flux | text2image
Hunyuan-DiT | text2image
I2VGen-XL | text2video
InstructPix2Pix | image editing
Kandinsky 2.1 | text2image, image2image, inpainting, interpolation
Kandinsky 2.2 | text2image, image2image, inpainting
Kandinsky 3 | text2image, image2image
Kolors | text2image
Latent Consistency Models | text2image
Latent Diffusion | text2image, super-resolution
Latte | text2image
LEDITS++ | image editing
Lumina-T2X | text2image
Marigold | depth
MultiDiffusion | text2image
MusicLDM | text2audio
PAG | text2image
Paint by Example | inpainting
PIA | image2video
PixArt-α | text2image
PixArt-Σ | text2image
Self-Attention Guidance | text2image
Semantic Guidance | text2image
Shap-E | text-to-3D, image-to-3D
Stable Audio | text2audio
Stable Cascade | text2image
Stable Diffusion | text2image, image2image, depth2image, inpainting, image variation, latent upscaler, super-resolution
Stable Diffusion XL | text2image, image2image, inpainting
Stable Diffusion XL Turbo | text2image, image2image, inpainting
Stable unCLIP | text2image, image variation
T2I-Adapter | text2image
Text2Video | text2video, video2video
Text2Video-Zero | text2video
unCLIP | text2image, image variation
UniDiffuser | text2image, image2text, image variation, text variation, unconditional image generation, unconditional audio generation
Value-guided planning | value guided sampling
Wuerstchen | text2image

##
DiffusionPipeline

###
class diffusers.DiffusionPipeline

< source >

( )

Base class for all pipelines.

DiffusionPipeline stores all components (models, schedulers, and processors) for diffusion pipelines and provides methods for loading, downloading and saving models. It also includes methods to:

- move all PyTorch modules to the device of your choice
- enable/disable the progress bar for the denoising iteration

Class attributes:

- config_name (`str`) — The configuration filename that stores the class and module names of all the diffusion pipeline’s components.
- _optional_components (`List[str]`) — List of all optional components that don’t have to be passed to the pipeline to function (should be overridden by subclasses).

####
__call__

( *args **kwargs )

Call self as a function.

####
device

< source >

( ) →
`torch.device`

Returns

`torch.device`

The torch device on which the pipeline is located.

####
to

< source >

( *args **kwargs ) →
DiffusionPipeline

Parameters

- dtype (`torch.dtype`, optional) — Returns a pipeline with the specified `dtype`
- device (`torch.Device`, optional) — Returns a pipeline with the specified `device`
- silence_dtype_warnings (`str`, optional, defaults to `False`) — Whether to omit warnings if the target `dtype` is not compatible with the target `device`.

Returns

DiffusionPipeline

The pipeline converted to specified `dtype` and/or `dtype`.

Performs Pipeline dtype and/or device conversion. A torch.dtype and torch.device are inferred from the arguments of `self.to(*args, **kwargs).`

If the pipeline already has the correct torch.dtype and torch.device, then it is returned as is. Otherwise, the returned pipeline is a copy of self with the desired torch.dtype and torch.device.

Here are the ways to call `to`:

- `to(dtype, silence_dtype_warnings=False) → DiffusionPipeline` to return a pipeline with the specified `dtype`
- `to(device, silence_dtype_warnings=False) → DiffusionPipeline` to return a pipeline with the specified `device`
- `to(device=None, dtype=None, silence_dtype_warnings=False) → DiffusionPipeline` to return a pipeline with the specified `device` and `dtype`

####
components

< source >

( )

The `self.components` property can be useful to run different pipelines with the same weights and configurations without reallocating additional memory.

Returns (`dict`): A dictionary containing all the modules needed to initialize the pipeline.

Examples:

    >>> from diffusers import (
    ...     StableDiffusionPipeline,
    ...     StableDiffusionImg2ImgPipeline,
    ...     StableDiffusionInpaintPipeline,
    ... )

    >>> text2img = StableDiffusionPipeline.from_pretrained("stable-diffusion-v1-5/stable-diffusion-v1-5")
    >>> img2img = StableDiffusionImg2ImgPipeline(**text2img.components)
    >>> inpaint = StableDiffusionInpaintPipeline(**text2img.components)

####
disable_attention_slicing

< source >

( )

Disable sliced attention computation. If `enable_attention_slicing` was previously called, attention is computed in one step.

####
disable_xformers_memory_efficient_attention

< source >

( )

Disable memory efficient attention from xFormers.

####
download

< source >

( pretrained_model_name **kwargs ) →
`os.PathLike`

Parameters

- pretrained_model_name (`str` or `os.PathLike`, optional) — A string, the repository id (for example `CompVis/ldm-text2im-large-256`) of a pretrained pipeline hosted on the Hub.
- custom_pipeline (`str`, optional) — Can be either:

  - A string, the repository id (for example `CompVis/ldm-text2im-large-256`) of a pretrained pipeline hosted on the Hub. The repository must contain a file called `pipeline.py` that defines the custom pipeline.

  - A string, the file name of a community pipeline hosted on GitHub under Community. Valid file names must match the file name and not the pipeline script (`clip_guided_stable_diffusion` instead of `clip_guided_stable_diffusion.py`). Community pipelines are always loaded from the current `main` branch of GitHub.

  - A path to a directory (`./my_pipeline_directory/`) containing a custom pipeline. The directory must contain a file called `pipeline.py` that defines the custom pipeline.

  🧪 This is an experimental feature and may change in the future.

  For more information on how to load and create custom pipelines, take a look at How to contribute a community pipeline.

- force_download (`bool`, optional, defaults to `False`) — Whether or not to force the (re-)download of the model weights and configuration files, overriding the cached versions if they exist.
- proxies (`Dict[str, str]`, optional) — A dictionary of proxy servers to use by protocol or endpoint, for example, `{'http': 'foo.bar:3128', 'http://hostname': 'foo.bar:4012'}`. The proxies are used on each request.
- output_loading_info(`bool`, optional, defaults to `False`) — Whether or not to also return a dictionary containing missing keys, unexpected keys and error messages.
- local_files_only (`bool`, optional, defaults to `False`) — Whether to only load local model weights and configuration files or not. If set to `True`, the model won’t be downloaded from the Hub.
- token (`str` or bool, optional) — The token to use as HTTP bearer authorization for remote files. If `True`, the token generated from `diffusers-cli login` (stored in `~/.huggingface`) is used.
- revision (`str`, optional, defaults to `"main"`) — The specific model version to use. It can be a branch name, a tag name, a commit id, or any identifier allowed by Git.
- custom_revision (`str`, optional, defaults to `"main"`) — The specific model version to use. It can be a branch name, a tag name, or a commit id similar to `revision` when loading a custom pipeline from the Hub. It can be a 🤗 Diffusers version when loading a custom pipeline from GitHub, otherwise it defaults to `"main"` when loading from the Hub.
- mirror (`str`, optional) — Mirror source to resolve accessibility issues if you’re downloading a model in China. We do not guarantee the timeliness or safety of the source, and you should refer to the mirror site for more information.
- variant (`str`, optional) — Load weights from a specified variant filename such as `"fp16"` or `"ema"`. This is ignored when loading `from_flax`.
- dduf_file(`str`, optional) — Load weights from the specified DDUF file.
- use_safetensors (`bool`, optional, defaults to `None`) — If set to `None`, the safetensors weights are downloaded if they’re available and if the safetensors library is installed. If set to `True`, the model is forcibly loaded from safetensors weights. If set to `False`, safetensors weights are not loaded.
- use_onnx (`bool`, optional, defaults to `False`) — If set to `True`, ONNX weights will always be downloaded if present. If set to `False`, ONNX weights will never be downloaded. By default `use_onnx` defaults to the `_is_onnx` class attribute which is `False` for non-ONNX pipelines and `True` for ONNX pipelines. ONNX weights include both files ending with `.onnx` and `.pb`.
- trust_remote_code (`bool`, optional, defaults to `False`) — Whether or not to allow for custom pipelines and components defined on the Hub in their own files. This option should only be set to `True` for repositories you trust and in which you have read the code, as it will execute code present on the Hub on your local machine.

Returns

`os.PathLike`

A path to the downloaded pipeline.

Download and cache a PyTorch diffusion pipeline from pretrained pipeline weights.

To use private or gated models, log-in with `huggingface-cli login`.

####
enable_attention_slicing

< source >

( slice_size: typing.Union[int, str, NoneType] = 'auto' )

Parameters

- slice_size (`str` or `int`, optional, defaults to `"auto"`) — When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If `"max"`, maximum amount of memory will be saved by running only one slice at a time. If a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case, `attention_head_dim` must be a multiple of `slice_size`.

Enable sliced attention computation. When this option is enabled, the attention module splits the input tensor in slices to compute attention in several steps. For more than one attention head, the computation is performed sequentially over each head. This is useful to save some memory in exchange for a small speed decrease.

⚠️ Don’t enable attention slicing if you’re already using `scaled_dot_product_attention` (SDPA) from PyTorch 2.0 or xFormers. These attention computations are already very memory efficient so you won’t need to enable this function. If you enable attention slicing with SDPA or xFormers, it can lead to serious slow downs!

Examples:

    >>> import torch
    >>> from diffusers import StableDiffusionPipeline

    >>> pipe = StableDiffusionPipeline.from_pretrained(
    ...     "stable-diffusion-v1-5/stable-diffusion-v1-5",
    ...     torch_dtype=torch.float16,
    ...     use_safetensors=True,
    ... )

    >>> prompt = "a photo of an astronaut riding a horse on mars"
    >>> pipe.enable_attention_slicing()
    >>> image = pipe(prompt).images[0]

####
enable_model_cpu_offload

< source >

( gpu_id: typing.Optional[int] = None device: typing.Union[torch.device, str] = 'cuda' )

Parameters

- gpu_id (`int`, optional) — The ID of the accelerator that shall be used in inference. If not specified, it will default to 0.
- device (`torch.Device` or `str`, optional, defaults to “cuda”) — The PyTorch device type of the accelerator that shall be used in inference. If not specified, it will default to “cuda”.

Offloads all models to CPU using accelerate, reducing memory usage with a low impact on performance. Compared to `enable_sequential_cpu_offload`, this method moves one whole model at a time to the GPU when its `forward` method is called, and the model remains in GPU until the next model runs. Memory savings are lower than with `enable_sequential_cpu_offload`, but performance is much better due to the iterative execution of the `unet`.

####
enable_sequential_cpu_offload

< source >

( gpu_id: typing.Optional[int] = None device: typing.Union[torch.device, str] = 'cuda' )

Parameters

- gpu_id (`int`, optional) — The ID of the accelerator that shall be used in inference. If not specified, it will default to 0.
- device (`torch.Device` or `str`, optional, defaults to “cuda”) — The PyTorch device type of the accelerator that shall be used in inference. If not specified, it will default to “cuda”.

Offloads all models to CPU using 🤗 Accelerate, significantly reducing memory usage. When called, the state dicts of all `torch.nn.Module` components (except those in `self._exclude_from_cpu_offload`) are saved to CPU and then moved to `torch.device('meta')` and loaded to GPU only when their specific submodule has its `forward` method called. Offloading happens on a submodule basis. Memory savings are higher than with `enable_model_cpu_offload`, but performance is lower.

####
enable_xformers_memory_efficient_attention

< source >

( attention_op: typing.Optional[typing.Callable] = None )

Parameters

- attention_op (`Callable`, optional) — Override the default `None` operator for use as `op` argument to the `memory_efficient_attention()` function of xFormers.

Enable memory efficient attention from xFormers. When this option is enabled, you should observe lower GPU memory usage and a potential speed up during inference. Speed up during training is not guaranteed.

⚠️ When memory efficient attention and sliced attention are both enabled, memory efficient attention takes precedent.

Examples:

    >>> import torch
    >>> from diffusers import DiffusionPipeline
    >>> from xformers.ops import MemoryEfficientAttentionFlashAttentionOp

    >>> pipe = DiffusionPipeline.from_pretrained("stabilityai/stable-diffusion-2-1", torch_dtype=torch.float16)
    >>> pipe = pipe.to("cuda")
    >>> pipe.enable_xformers_memory_efficient_attention(attention_op=MemoryEfficientAttentionFlashAttentionOp)
    >>> # Workaround for not accepting attention shape using VAE for Flash Attention
    >>> pipe.vae.enable_xformers_memory_efficient_attention(attention_op=None)

####
from_pipe

< source >

( pipeline **kwargs ) →
`DiffusionPipeline`

Parameters

- pipeline (`DiffusionPipeline`) — The pipeline from which to create a new pipeline.

Returns

`DiffusionPipeline`

A new pipeline with the same weights and configurations as `pipeline`.

Create a new pipeline from a given pipeline. This method is useful to create a new pipeline from the existing pipeline components without reallocating additional memory.

Examples:

    >>> from diffusers import StableDiffusionPipeline, StableDiffusionSAGPipeline

    >>> pipe = StableDiffusionPipeline.from_pretrained("stable-diffusion-v1-5/stable-diffusion-v1-5")
    >>> new_pipe = StableDiffusionSAGPipeline.from_pipe(pipe)

####
from_pretrained

< source >

( pretrained_model_name_or_path: typing.Union[str, os.PathLike, NoneType] **kwargs )

Parameters

- pretrained_model_name_or_path (`str` or `os.PathLike`, optional) — Can be either:
  - A string, the repo id (for example `CompVis/ldm-text2im-large-256`) of a pretrained pipeline hosted on the Hub.
  - A path to a directory (for example `./my_pipeline_directory/`) containing pipeline weights saved using save_pretrained().
  - A path to a directory (for example `./my_pipeline_directory/`) containing a dduf file
- torch_dtype (`str` or `torch.dtype`, optional) — Override the default `torch.dtype` and load the model with another dtype. If “auto” is passed, the dtype is automatically derived from the model’s weights.
- custom_pipeline (`str`, optional) —

  🧪 This is an experimental feature and may change in the future.

  Can be either:

  - A string, the repo id (for example `hf-internal-testing/diffusers-dummy-pipeline`) of a custom pipeline hosted on the Hub. The repository must contain a file called pipeline.py that defines the custom pipeline.
  - A string, the file name of a community pipeline hosted on GitHub under Community. Valid file names must match the file name and not the pipeline script (`clip_guided_stable_diffusion` instead of `clip_guided_stable_diffusion.py`). Community pipelines are always loaded from the current main branch of GitHub.
  - A path to a directory (`./my_pipeline_directory/`) containing a custom pipeline. The directory must contain a file called `pipeline.py` that defines the custom pipeline.

  For more information on how to load and create custom pipelines, please have a look at Loading and Adding Custom Pipelines

- force_download (`bool`, optional, defaults to `False`) — Whether or not to force the (re-)download of the model weights and configuration files, overriding the cached versions if they exist.
- cache_dir (`Union[str, os.PathLike]`, optional) — Path to a directory where a downloaded pretrained model configuration is cached if the standard cache is not used.
- proxies (`Dict[str, str]`, optional) — A dictionary of proxy servers to use by protocol or endpoint, for example, `{'http': 'foo.bar:3128', 'http://hostname': 'foo.bar:4012'}`. The proxies are used on each request.
- output_loading_info(`bool`, optional, defaults to `False`) — Whether or not to also return a dictionary containing missing keys, unexpected keys and error messages.
- local_files_only (`bool`, optional, defaults to `False`) — Whether to only load local model weights and configuration files or not. If set to `True`, the model won’t be downloaded from the Hub.
- token (`str` or bool, optional) — The token to use as HTTP bearer authorization for remote files. If `True`, the token generated from `diffusers-cli login` (stored in `~/.huggingface`) is used.
- revision (`str`, optional, defaults to `"main"`) — The specific model version to use. It can be a branch name, a tag name, a commit id, or any identifier allowed by Git.
- custom_revision (`str`, optional) — The specific model version to use. It can be a branch name, a tag name, or a commit id similar to `revision` when loading a custom pipeline from the Hub. Defaults to the latest stable 🤗 Diffusers version.
- mirror (`str`, optional) — Mirror source to resolve accessibility issues if you’re downloading a model in China. We do not guarantee the timeliness or safety of the source, and you should refer to the mirror site for more information.
- device_map (`str` or `Dict[str, Union[int, str, torch.device]]`, optional) — A map that specifies where each submodule should go. It doesn’t need to be defined for each parameter/buffer name; once a given module name is inside, every submodule of it will be sent to the same device.

  Set `device_map="auto"` to have 🤗 Accelerate automatically compute the most optimized `device_map`. For more information about each option see designing a device map.

- max_memory (`Dict`, optional) — A dictionary device identifier for the maximum memory. Will default to the maximum memory available for each GPU and the available CPU RAM if unset.
- offload_folder (`str` or `os.PathLike`, optional) — The path to offload weights if device_map contains the value `"disk"`.
- offload_state_dict (`bool`, optional) — If `True`, temporarily offloads the CPU state dict to the hard drive to avoid running out of CPU RAM if the weight of the CPU state dict + the biggest shard of the checkpoint does not fit. Defaults to `True` when there is some disk offload.
- low_cpu_mem_usage (`bool`, optional, defaults to `True` if torch version >= 1.9.0 else `False`) — Speed up model loading only loading the pretrained weights and not initializing the weights. This also tries to not use more than 1x model size in CPU memory (including peak memory) while loading the model. Only supported for PyTorch >= 1.9.0. If you are using an older version of PyTorch, setting this argument to `True` will raise an error.
- use_safetensors (`bool`, optional, defaults to `None`) — If set to `None`, the safetensors weights are downloaded if they’re available and if the safetensors library is installed. If set to `True`, the model is forcibly loaded from safetensors weights. If set to `False`, safetensors weights are not loaded.
- use_onnx (`bool`, optional, defaults to `None`) — If set to `True`, ONNX weights will always be downloaded if present. If set to `False`, ONNX weights will never be downloaded. By default `use_onnx` defaults to the `_is_onnx` class attribute which is `False` for non-ONNX pipelines and `True` for ONNX pipelines. ONNX weights include both files ending with `.onnx` and `.pb`.
- kwargs (remaining dictionary of keyword arguments, optional) — Can be used to overwrite load and saveable variables (the pipeline components of the specific pipeline class). The overwritten components are passed directly to the pipelines `__init__` method. See example below for more information.
- variant (`str`, optional) — Load weights from a specified variant filename such as `"fp16"` or `"ema"`. This is ignored when loading `from_flax`.
- dduf_file(`str`, optional) — Load weights from the specified dduf file.

Instantiate a PyTorch diffusion pipeline from pretrained pipeline weights.

The pipeline is set in evaluation mode (`model.eval()`) by default.

If you get the error message below, you need to finetune the weights for your downstream task:

    Some weights of UNet2DConditionModel were not initialized from the model checkpoint at stable-diffusion-v1-5/stable-diffusion-v1-5 and are newly initialized because the shapes did not match:
    - conv_in.weight: found shape torch.Size([320, 4, 3, 3]) in the checkpoint and torch.Size([320, 9, 3, 3]) in the model instantiated
    You should probably TRAIN this model on a down-stream task to be able to use it for predictions and inference.

To use private or gated models, log-in with `huggingface-cli login`.

Examples:

    >>> from diffusers import DiffusionPipeline

    >>> # Download pipeline from huggingface.co and cache.
    >>> pipeline = DiffusionPipeline.from_pretrained("CompVis/ldm-text2im-large-256")

    >>> # Download pipeline that requires an authorization token
    >>> # For more information on access tokens, please refer to this section
    >>> # of the documentation](https://huggingface.co/docs/hub/security-tokens)
    >>> pipeline = DiffusionPipeline.from_pretrained("stable-diffusion-v1-5/stable-diffusion-v1-5")

    >>> # Use a different scheduler
    >>> from diffusers import LMSDiscreteScheduler

    >>> scheduler = LMSDiscreteScheduler.from_config(pipeline.scheduler.config)
    >>> pipeline.scheduler = scheduler

####
maybe_free_model_hooks

< source >

( )

Method that performs the following:

- Offloads all components.
- Removes all model hooks that were added when using `enable_model_cpu_offload`, and then applies them again. In case the model has not been offloaded, this function is a no-op.
- Resets stateful diffusers hooks of denoiser components if they were added with `register_hook()`.

Make sure to add this function to the end of the `__call__` function of your pipeline so that it functions correctly when applying `enable_model_cpu_offload`.

####
numpy_to_pil

< source >

( images )

Convert a NumPy image or a batch of images to a PIL image.

####
remove_all_hooks

< source >

( )

Removes all hooks that were added when using `enable_sequential_cpu_offload` or `enable_model_cpu_offload`.

####
reset_device_map

< source >

( )

Resets the device maps (if any) to None.

####
save_pretrained

< source >

( save_directory: typing.Union[str, os.PathLike] safe_serialization: bool = True variant: typing.Optional[str] = None max_shard_size: typing.Union[int, str, NoneType] = None push_to_hub: bool = False **kwargs )

Parameters

- save_directory (`str` or `os.PathLike`) — Directory to save a pipeline to. Will be created if it doesn’t exist.
- safe_serialization (`bool`, optional, defaults to `True`) — Whether to save the model using `safetensors` or the traditional PyTorch way with `pickle`.
- variant (`str`, optional) — If specified, weights are saved in the format `pytorch_model.<variant>.bin`.
- max_shard_size (`int` or `str`, defaults to `None`) — The maximum size for a checkpoint before being sharded. Checkpoints shard will then be each of size lower than this size. If expressed as a string, needs to be digits followed by a unit (like `"5GB"`). If expressed as an integer, the unit is bytes. Note that this limit will be decreased after a certain period of time (starting from Oct 2024) to allow users to upgrade to the latest version of `diffusers`. This is to establish a common default size for this argument across different libraries in the Hugging Face ecosystem (`transformers`, and `accelerate`, for example).
- push_to_hub (`bool`, optional, defaults to `False`) — Whether or not to push your model to the Hugging Face model hub after saving it. You can specify the repository you want to push to with `repo_id` (will default to the name of `save_directory` in your namespace).
- kwargs (`Dict[str, Any]`, optional) — Additional keyword arguments passed along to the push_to_hub() method.

Save all saveable variables of the pipeline to a directory. A pipeline variable can be saved and loaded if its class implements both a save and loading method. The pipeline is easily reloaded using the from_pretrained() class method.

####
diffusers.StableDiffusionMixin.enable_freeu

< source >

( s1: float s2: float b1: float b2: float )

Parameters

- s1 (`float`) — Scaling factor for stage 1 to attenuate the contributions of the skip features. This is done to mitigate “oversmoothing effect” in the enhanced denoising process.
- s2 (`float`) — Scaling factor for stage 2 to attenuate the contributions of the skip features. This is done to mitigate “oversmoothing effect” in the enhanced denoising process.
- b1 (`float`) — Scaling factor for stage 1 to amplify the contributions of backbone features.
- b2 (`float`) — Scaling factor for stage 2 to amplify the contributions of backbone features.

Enables the FreeU mechanism as in https://arxiv.org/abs/2309.11497.

The suffixes after the scaling factors represent the stages where they are being applied.

Please refer to the official repository for combinations of the values that are known to work well for different pipelines such as Stable Diffusion v1, v2, and Stable Diffusion XL.

####
diffusers.StableDiffusionMixin.disable_freeu

< source >

( )

Disables the FreeU mechanism if enabled.

##
FlaxDiffusionPipeline

###
class diffusers.FlaxDiffusionPipeline

< source >

( )

Base class for Flax-based pipelines.

FlaxDiffusionPipeline stores all components (models, schedulers, and processors) for diffusion pipelines and provides methods for loading, downloading and saving models. It also includes methods to:

- enable/disable the progress bar for the denoising iteration

Class attributes:

- config_name (`str`) — The configuration filename that stores the class and module names of all the diffusion pipeline’s components.

####
from_pretrained

< source >

( pretrained_model_name_or_path: typing.Union[str, os.PathLike, NoneType] **kwargs )

Parameters

- pretrained_model_name_or_path (`str` or `os.PathLike`, optional) — Can be either:
  - A string, the repo id (for example `stable-diffusion-v1-5/stable-diffusion-v1-5`) of a pretrained pipeline hosted on the Hub.
  - A path to a directory (for example `./my_model_directory`) containing the model weights saved using save_pretrained().
- dtype (`str` or `jnp.dtype`, optional) — Override the default `jnp.dtype` and load the model under this dtype. If `"auto"`, the dtype is automatically derived from the model’s weights.
- force_download (`bool`, optional, defaults to `False`) — Whether or not to force the (re-)download of the model weights and configuration files, overriding the cached versions if they exist.
- proxies (`Dict[str, str]`, optional) — A dictionary of proxy servers to use by protocol or endpoint, for example, `{'http': 'foo.bar:3128', 'http://hostname': 'foo.bar:4012'}`. The proxies are used on each request.
- output_loading_info(`bool`, optional, defaults to `False`) — Whether or not to also return a dictionary containing missing keys, unexpected keys and error messages.
- local_files_only (`bool`, optional, defaults to `False`) — Whether to only load local model weights and configuration files or not. If set to `True`, the model won’t be downloaded from the Hub.
- token (`str` or bool, optional) — The token to use as HTTP bearer authorization for remote files. If `True`, the token generated from `diffusers-cli login` (stored in `~/.huggingface`) is used.
- revision (`str`, optional, defaults to `"main"`) — The specific model version to use. It can be a branch name, a tag name, a commit id, or any identifier allowed by Git.
- mirror (`str`, optional) — Mirror source to resolve accessibility issues if you’re downloading a model in China. We do not guarantee the timeliness or safety of the source, and you should refer to the mirror site for more information.
- kwargs (remaining dictionary of keyword arguments, optional) — Can be used to overwrite load and saveable variables (the pipeline components) of the specific pipeline class. The overwritten components are passed directly to the pipelines `__init__` method.

Instantiate a Flax-based diffusion pipeline from pretrained pipeline weights.

The pipeline is set in evaluation mode (`model.eval()) by default and dropout modules are deactivated.

If you get the error message below, you need to finetune the weights for your downstream task:

    Some weights of FlaxUNet2DConditionModel were not initialized from the model checkpoint at stable-diffusion-v1-5/stable-diffusion-v1-5 and are newly initialized because the shapes did not match:

To use private or gated models, log-in with `huggingface-cli login`.

Examples:

    >>> from diffusers import FlaxDiffusionPipeline

    >>> # Download pipeline from huggingface.co and cache.
    >>> # Requires to be logged in to Hugging Face hub,
    >>> # see more in [the documentation](https://huggingface.co/docs/hub/security-tokens)
    >>> pipeline, params = FlaxDiffusionPipeline.from_pretrained(
    ...     "stable-diffusion-v1-5/stable-diffusion-v1-5",
    ...     variant="bf16",
    ...     dtype=jnp.bfloat16,
    ... )

    >>> # Download pipeline, but use a different scheduler
    >>> from diffusers import FlaxDPMSolverMultistepScheduler

    >>> model_id = "stable-diffusion-v1-5/stable-diffusion-v1-5"
    >>> dpmpp, dpmpp_state = FlaxDPMSolverMultistepScheduler.from_pretrained(
    ...     model_id,
    ...     subfolder="scheduler",
    ... )

    >>> dpm_pipe, dpm_params = FlaxStableDiffusionPipeline.from_pretrained(
    ...     model_id, variant="bf16", dtype=jnp.bfloat16, scheduler=dpmpp
    ... )
    >>> dpm_params["scheduler"] = dpmpp_state

####
numpy_to_pil

< source >

( images )

Convert a NumPy image or a batch of images to a PIL image.

####
save_pretrained

< source >

( save_directory: typing.Union[str, os.PathLike] params: typing.Union[typing.Dict, flax.core.frozen_dict.FrozenDict] push_to_hub: bool = False **kwargs )

Parameters

- save_directory (`str` or `os.PathLike`) — Directory to which to save. Will be created if it doesn’t exist.
- push_to_hub (`bool`, optional, defaults to `False`) — Whether or not to push your model to the Hugging Face model hub after saving it. You can specify the repository you want to push to with `repo_id` (will default to the name of `save_directory` in your namespace).
- kwargs (`Dict[str, Any]`, optional) — Additional keyword arguments passed along to the push_to_hub() method.

Save all saveable variables of the pipeline to a directory. A pipeline variable can be saved and loaded if its class implements both a save and loading method. The pipeline is easily reloaded using the from_pretrained() class method.

##
PushToHubMixin

###
class diffusers.utils.PushToHubMixin

< source >

( )

A Mixin to push a model, scheduler, or pipeline to the Hugging Face Hub.

####
push_to_hub

< source >

( repo_id: str commit_message: typing.Optional[str] = None private: typing.Optional[bool] = None token: typing.Optional[str] = None create_pr: bool = False safe_serialization: bool = True variant: typing.Optional[str] = None )

Parameters

- repo_id (`str`) — The name of the repository you want to push your model, scheduler, or pipeline files to. It should contain your organization name when pushing to an organization. `repo_id` can also be a path to a local directory.
- commit_message (`str`, optional) — Message to commit while pushing. Default to `"Upload {object}"`.
- private (`bool`, optional) — Whether to make the repo private. If `None` (default), the repo will be public unless the organization’s default is private. This value is ignored if the repo already exists.
- token (`str`, optional) — The token to use as HTTP bearer authorization for remote files. The token generated when running `huggingface-cli login` (stored in `~/.huggingface`).
- create_pr (`bool`, optional, defaults to `False`) — Whether or not to create a PR with the uploaded files or directly commit.
- safe_serialization (`bool`, optional, defaults to `True`) — Whether or not to convert the model weights to the `safetensors` format.
- variant (`str`, optional) — If specified, weights are saved in the format `pytorch_model.<variant>.bin`.

Upload model, scheduler, or pipeline files to the 🤗 Hugging Face Hub.

Examples:

    from diffusers import UNet2DConditionModel

    unet = UNet2DConditionModel.from_pretrained("stabilityai/stable-diffusion-2", subfolder="unet")

    # Push the `unet` to your namespace with the name "my-finetuned-unet".
    unet.push_to_hub("my-finetuned-unet")

    # Push the `unet` to an organization with the name "my-finetuned-unet".
    unet.push_to_hub("your-org/my-finetuned-unet")

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