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Textual inversion

The StableDiffusionPipeline supports textual inversion, a technique that enables a model like Stable Diffusion to learn a new concept from just a few sample images. This gives you more control over the generated images and allows you to tailor the model towards specific concepts. You can get started quickly with a collection of community created concepts in the Stable Diffusion Conceptualizer.

This guide will show you how to run inference with textual inversion using a pre-learned concept from the Stable Diffusion Conceptualizer. If you’re interested in teaching a model new concepts with textual inversion, take a look at the Textual Inversion training guide.

Import the necessary libraries:

    import torch
    from diffusers import StableDiffusionPipeline
    from diffusers.utils import make_image_grid

##
Stable Diffusion 1 and 2

Pick a Stable Diffusion checkpoint and a pre-learned concept from the Stable Diffusion Conceptualizer:

    pretrained_model_name_or_path = "runwayml/stable-diffusion-v1-5"
    repo_id_embeds = "sd-concepts-library/cat-toy"

Now you can load a pipeline, and pass the pre-learned concept to it:

    pipeline = StableDiffusionPipeline.from_pretrained(
        pretrained_model_name_or_path, torch_dtype=torch.float16, use_safetensors=True
    ).to("cuda")

    pipeline.load_textual_inversion(repo_id_embeds)

Create a prompt with the pre-learned concept by using the special placeholder token `<cat-toy>`, and choose the number of samples and rows of images you’d like to generate:

    prompt = "a grafitti in a favela wall with a <cat-toy> on it"

    num_samples_per_row = 2
    num_rows = 2

Then run the pipeline (feel free to adjust the parameters like `num_inference_steps` and `guidance_scale` to see how they affect image quality), save the generated images and visualize them with the helper function you created at the beginning:

    all_images = []
    for _ in range(num_rows):
        images = pipeline(prompt, num_images_per_prompt=num_samples_per_row, num_inference_steps=50, guidance_scale=7.5).images
        all_images.extend(images)

    grid = make_image_grid(all_images, num_rows, num_samples_per_row)
    grid

##
Stable Diffusion XL

Stable Diffusion XL (SDXL) can also use textual inversion vectors for inference. In contrast to Stable Diffusion 1 and 2, SDXL has two text encoders so you’ll need two textual inversion embeddings - one for each text encoder model.

Let’s download the SDXL textual inversion embeddings and have a closer look at it’s structure:

    from huggingface_hub import hf_hub_download
    from safetensors.torch import load_file

    file = hf_hub_download("dn118/unaestheticXL", filename="unaestheticXLv31.safetensors")
    state_dict = load_file(file)
    state_dict

    {'clip_g': tensor([[ 0.0077, -0.0112,  0.0065,  ...,  0.0195,  0.0159,  0.0275],
             ...,
             [-0.0170,  0.0213,  0.0143,  ..., -0.0302, -0.0240, -0.0362]],
     'clip_l': tensor([[ 0.0023,  0.0192,  0.0213,  ..., -0.0385,  0.0048, -0.0011],
             ...,
             [ 0.0475, -0.0508, -0.0145,  ...,  0.0070, -0.0089, -0.0163]],

There are two tensors, `"clip_g"` and `"clip_l"`. `"clip_g"` corresponds to the bigger text encoder in SDXL and refers to `pipe.text_encoder_2` and `"clip_l"` refers to `pipe.text_encoder`.

Now you can load each tensor separately by passing them along with the correct text encoder and tokenizer to load_textual_inversion():

    from diffusers import AutoPipelineForText2Image
    import torch

    pipe = AutoPipelineForText2Image.from_pretrained("stabilityai/stable-diffusion-xl-base-1.0", variant="fp16", torch_dtype=torch.float16)
    pipe.to("cuda")

    pipe.load_textual_inversion(state_dict["clip_g"], token="unaestheticXLv31", text_encoder=pipe.text_encoder_2, tokenizer=pipe.tokenizer_2)
    pipe.load_textual_inversion(state_dict["clip_l"], token="unaestheticXLv31", text_encoder=pipe.text_encoder, tokenizer=pipe.tokenizer)

    # the embedding should be used as a negative embedding, so we pass it as a negative prompt
    generator = torch.Generator().manual_seed(33)
    image = pipe("a woman standing in front of a mountain", negative_prompt="unaestheticXLv31", generator=generator).images[0]
    image