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Textual Inversion

Textual Inversion is a method for generating personalized images of a concept. It works by fine-tuning a models word embeddings on 3-5 images of the concept (for example, pixel art) that is associated with a unique token (`<sks>`). This allows you to use the `<sks>` token in your prompt to trigger the model to generate pixel art images.

Textual Inversion weights are very lightweight and typically only a few KBs because they’re only word embeddings. However, this also means the word embeddings need to be loaded after loading a model with from_pretrained().

    import torch
    from diffusers import AutoPipelineForText2Image

    pipeline = AutoPipelineForText2Image.from_pretrained(
        "stable-diffusion-v1-5/stable-diffusion-v1-5",
        torch_dtype=torch.float16
    ).to("cuda")

Load the word embeddings with load_textual_inversion() and include the unique token in the prompt to activate its generation.

    pipeline.load_textual_inversion("sd-concepts-library/gta5-artwork")
    prompt = "A cute brown bear eating a slice of pizza, stunning color scheme, masterpiece, illustration, <gta5-artwork> style"
    pipeline(prompt).images[0]

Textual Inversion can also be trained to learn negative embeddings to steer generation away from unwanted characteristics such as “blurry” or “ugly”. It is useful for improving image quality.

EasyNegative is a widely used negative embedding that contains multiple learned negative concepts. Load the negative embeddings and specify the file name and token associated with the negative embeddings. Pass the token to `negative_prompt` in your pipeline to activate it.

    import torch
    from diffusers import AutoPipelineForText2Image

    pipeline = AutoPipelineForText2Image.from_pretrained(
        "stable-diffusion-v1-5/stable-diffusion-v1-5",
        torch_dtype=torch.float16
    ).to("cuda")
    pipeline.load_textual_inversion(
        "EvilEngine/easynegative",
        weight_name="easynegative.safetensors",
        token="easynegative"
    )
    prompt = "A cute brown bear eating a slice of pizza, stunning color scheme, masterpiece, illustration"
    negative_prompt = "easynegative"
    pipeline(prompt, negative_prompt).images[0]

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