Stable Diffusion Long Prompt Weighted Embedding

Overcoming the 77-token prompt limitation, generating long-weighted prompt embeddings for Stable Diffusion, this module supports generating embedding and pooled embeddings for long prompt weighted. The generated embedding is compatible with Huggingface Diffusers.

The prompt format is compatible with AUTOMATIC1111 stable-diffusion-webui

Support unlimited prompt length for SD1.5 and SDXL
Support weighting like a (white:1.2) cat
Support parentheses like a ((white)) cat
For SD3, support max 512 tokens (T5 model support max 512 tokens)

Support Stable Diffusion v1.5, SDXL and Stable Diffusion 3.

The detailed implementation is covered in chapter 10 of book Using Stable Diffusion with Python

Updates

[08/06/2024] Add FLUX.1 long prompt support, check out samples/lpw_flux1.py file to see the usage sample.

[06/30/2024] Add support Stable Diffusion 3 pipeline without T5 encoder.

model_path = "stabilityai/stable-diffusion-3-medium-diffusers"
pipe = StableDiffusion3Pipeline.from_pretrained(
model_path
, torch_dtype       = torch.float16
, text_encoder_3    = None          # <- load SD3 without T5 encoder
)

Install

pip install git+https://github.com/xhinker/sd_embed.git@main

Flux.1

To use Flux.1 in a 24G VRAM GPU, we need to quantize the Transformer model and T5 text encoder model to qfloat8 using optimum-quanto. see Quanto: a PyTorch quantization backend for Optimum and Memory-efficient Diffusion Transformers with Quanto and Diffusers to convert Diffusion model weights to qfloat8 so that we can use Flux in a 24G VRAM with Diffusers.

Here is the complete usage sample:

#%%
import torch
from optimum.quanto import freeze, qfloat8, quantize
from diffusers.pipelines.flux.pipeline_flux import FluxPipeline
from sd_embed.embedding_funcs import get_weighted_text_embeddings_flux1

dtype = torch.bfloat16
bfl_repo = "black-forest-labs/FLUX.1-schnell"
pipe = FluxPipeline.from_pretrained(
    pretrained_model_name_or_path   = bfl_repo
    , torch_dtype                   = torch.bfloat16
)

#%%
weight_quant = qfloat8
quantize(pipe.transformer, weights=weight_quant)
freeze(pipe.transformer)

quantize(pipe.text_encoder, weights=weight_quant)
freeze(pipe.text_encoder)

quantize(pipe.text_encoder_2, weights=weight_quant)
freeze(pipe.text_encoder_2)

#%%
prompt = """\
A dreamy, soft-focus photograph capturing a romantic Jane Austen movie scene, 
in the style of Agnes Cecile. Delicate watercolors, misty background, 
Regency-era couple, tender embrace, period clothing, flowing dress, dappled sunlight, 
ethereal glow, gentle expressions, intricate lace, muted pastels, serene countryside, 
timeless romance, poetic atmosphere, wistful mood, look at camera.
"""

pipe_device = 'cuda:0'
pipe.to(pipe_device)
prompt_embeds, pooled_prompt_embeds = get_weighted_text_embeddings_flux1(
    pipe = pipe
    , prompt = prompt
)

seed = 1234
image = pipe(
    prompt_embeds               = prompt_embeds
    , pooled_prompt_embeds      = pooled_prompt_embeds
    , width                     = 1024 #1280 #1680 #1024 
    , height                    = 1680 #1280 #1024 #1680 #1024
    , num_inference_steps       = 20
    , generator                 = torch.Generator().manual_seed(seed)
    , guidance_scale            = 3.5
).images[0]
display(image)

del prompt_embeds,pooled_prompt_embeds
pipe.to('cpu')
torch.cuda.empty_cache()

If you use FLUX.1-schnell, set num_inference_steps to 4.

alt text

Stable Diffusion 3

Generate long prompt weighted embeddings for Stable Diffusion 3. A

Load up SD3 model:

import gc
import torch
from diffusers import StableDiffusion3Pipeline
from sd_embed.embedding_funcs import get_weighted_text_embeddings_sd3

model_path = "stabilityai/stable-diffusion-3-medium-diffusers"
pipe = StableDiffusion3Pipeline.from_pretrained(
    model_path,
    torch_dtype=torch.float16
)

Generate the embedding and use it to generate images:

pipe.to('cuda')

prompt = """A whimsical and creative image depicting a hybrid creature that is a mix of a waffle and a hippopotamus. 
This imaginative creature features the distinctive, bulky body of a hippo, 
but with a texture and appearance resembling a golden-brown, crispy waffle. 
The creature might have elements like waffle squares across its skin and a syrup-like sheen. 
It's set in a surreal environment that playfully combines a natural water habitat of a hippo with elements of a breakfast table setting, 
possibly including oversized utensils or plates in the background. 
The image should evoke a sense of playful absurdity and culinary fantasy.
"""

neg_prompt = """\
skin spots,acnes,skin blemishes,age spot,(ugly:1.2),(duplicate:1.2),(morbid:1.21),(mutilated:1.2),\
(tranny:1.2),mutated hands,(poorly drawn hands:1.5),blurry,(bad anatomy:1.2),(bad proportions:1.3),\
extra limbs,(disfigured:1.2),(missing arms:1.2),(extra legs:1.2),(fused fingers:1.5),\
(too many fingers:1.5),(unclear eyes:1.2),lowers,bad hands,missing fingers,extra digit,\
bad hands,missing fingers,(extra arms and legs),(worst quality:2),(low quality:2),\
(normal quality:2),lowres,((monochrome)),((grayscale))
"""

(
    prompt_embeds
    , prompt_neg_embeds
    , pooled_prompt_embeds
    , negative_pooled_prompt_embeds
) = get_weighted_text_embeddings_sd3(
    pipe
    , prompt = prompt
    , neg_prompt = neg_prompt
)

image = pipe(
    prompt_embeds                   = prompt_embeds
    , negative_prompt_embeds        = prompt_neg_embeds
    , pooled_prompt_embeds          = pooled_prompt_embeds
    , negative_pooled_prompt_embeds = negative_pooled_prompt_embeds
    , num_inference_steps           = 30
    , height                        = 1024 
    , width                         = 1024 + 512
    , guidance_scale                = 4.0
    , generator                     = torch.Generator("cuda").manual_seed(2)
).images[0]
display(image)

del prompt_embeds, prompt_neg_embeds,pooled_prompt_embeds, negative_pooled_prompt_embeds
pipe.to('cpu')
gc.collect()
torch.cuda.empty_cache()

Results

Using long weighted embedding result: alt text

Without long prompt weighted embedding result: alt text

Stable Diffusion XL

To use the long prompt weighted embedding for SDXL, simply import the embedding function - from sd_embed.embedding_funcs import get_weighted_text_embeddings_sdxl for sdxl.

import gc
import torch
from diffusers import StableDiffusionXLPipeline
from sd_embed.embedding_funcs import get_weighted_text_embeddings_sdxl

model_path = "Lykon/dreamshaper-xl-1-0"
pipe = StableDiffusionXLPipeline.from_pretrained(
    model_path,
    torch_dtype=torch.float16
)
pipe.to('cuda')

prompt = """A whimsical and creative image depicting a hybrid creature that is a mix of a waffle and a hippopotamus. 
This imaginative creature features the distinctive, bulky body of a hippo, 
but with a texture and appearance resembling a golden-brown, crispy waffle. 
The creature might have elements like waffle squares across its skin and a syrup-like sheen. 
It's set in a surreal environment that playfully combines a natural water habitat of a hippo with elements of a breakfast table setting, 
possibly including oversized utensils or plates in the background. 
The image should evoke a sense of playful absurdity and culinary fantasy.
"""

neg_prompt = """\
skin spots,acnes,skin blemishes,age spot,(ugly:1.2),(duplicate:1.2),(morbid:1.21),(mutilated:1.2),\
(tranny:1.2),mutated hands,(poorly drawn hands:1.5),blurry,(bad anatomy:1.2),(bad proportions:1.3),\
extra limbs,(disfigured:1.2),(missing arms:1.2),(extra legs:1.2),(fused fingers:1.5),\
(too many fingers:1.5),(unclear eyes:1.2),lowers,bad hands,missing fingers,extra digit,\
bad hands,missing fingers,(extra arms and legs),(worst quality:2),(low quality:2),\
(normal quality:2),lowres,((monochrome)),((grayscale))
"""

(
    prompt_embeds
    , prompt_neg_embeds
    , pooled_prompt_embeds
    , negative_pooled_prompt_embeds
) = get_weighted_text_embeddings_sdxl(
    pipe
    , prompt = prompt
    , neg_prompt = neg_prompt
)

image = pipe(
    prompt_embeds                   = prompt_embeds
    , negative_prompt_embeds        = prompt_neg_embeds
    , pooled_prompt_embeds          = pooled_prompt_embeds
    , negative_pooled_prompt_embeds = negative_pooled_prompt_embeds
    , num_inference_steps           = 30
    , height                        = 1024 
    , width                         = 1024 + 512
    , guidance_scale                = 4.0
    , generator                     = torch.Generator("cuda").manual_seed(2)
).images[0]
display(image)

del prompt_embeds, prompt_neg_embeds,pooled_prompt_embeds, negative_pooled_prompt_embeds
pipe.to('cpu')
gc.collect()
torch.cuda.empty_cache()

Results

Using long prompt weighted embedding: alt text

Without using long prompt weighted embedding: alt text

Stable Diffusion V1.5

To use the long prompt weighted embedding for SDXL, use the embedding function - get_weighted_text_embeddings_sd15.

import gc
import torch
from diffusers import StableDiffusionPipeline
from sd_embed.embedding_funcs import get_weighted_text_embeddings_sd15

model_path = "stablediffusionapi/deliberate-v2"
pipe = StableDiffusionPipeline.from_pretrained(
    model_path,
    torch_dtype=torch.float16
)

pipe.to('cuda')

prompt = """A whimsical and creative image depicting a hybrid creature that is a mix of a waffle and a hippopotamus. 
This imaginative creature features the distinctive, bulky body of a hippo, 
but with a texture and appearance resembling a golden-brown, crispy waffle. 
The creature might have elements like waffle squares across its skin and a syrup-like sheen. 
It's set in a surreal environment that playfully combines a natural water habitat of a hippo with elements of a breakfast table setting, 
possibly including oversized utensils or plates in the background. 
The image should evoke a sense of playful absurdity and culinary fantasy.
"""

neg_prompt = """\
skin spots,acnes,skin blemishes,age spot,(ugly:1.2),(duplicate:1.2),(morbid:1.21),(mutilated:1.2),\
(tranny:1.2),mutated hands,(poorly drawn hands:1.5),blurry,(bad anatomy:1.2),(bad proportions:1.3),\
extra limbs,(disfigured:1.2),(missing arms:1.2),(extra legs:1.2),(fused fingers:1.5),\
(too many fingers:1.5),(unclear eyes:1.2),lowers,bad hands,missing fingers,extra digit,\
bad hands,missing fingers,(extra arms and legs),(worst quality:2),(low quality:2),\
(normal quality:2),lowres,((monochrome)),((grayscale))
"""

(
    prompt_embeds
    , prompt_neg_embeds
) = get_weighted_text_embeddings_sd15(
    pipe
    , prompt = prompt
    , neg_prompt = neg_prompt
)

image = pipe(
    prompt_embeds                   = prompt_embeds
    , negative_prompt_embeds        = prompt_neg_embeds
    , num_inference_steps           = 30
    , height                        = 768
    , width                         = 896
    , guidance_scale                = 8.0
    , generator                     = torch.Generator("cuda").manual_seed(2)
).images[0]
display(image)

del prompt_embeds, prompt_neg_embeds
pipe.to('cpu')
gc.collect()
torch.cuda.empty_cache()

Results

Using long prompt weighted embedding: alt text

Without using long prompt weighted embedding: alt text

Citation

If you use sd_embed in your research, please cite the following work:

@misc{sd_embed_2024,
  author       = {Shudong Zhu(Andrew Zhu)},
  title        = {Long Prompt Weighted Stable Diffusion Embedding},
  howpublished = {\url{https://github.com/xhinker/sd_embed}},
  year         = {2024},
}

xhinker / sd_embed

readme

Stable Diffusion Long Prompt Weighted Embedding

Updates

Install

Flux.1

Stable Diffusion 3

Results

Stable Diffusion XL

Results

Stable Diffusion V1.5

Results

Citation