Latent Consistency Models Training

You can also check configs/lcm_lora/README.md file.

Configs

All configuration files are placed under the configs/lcm_lora folder.

Following is the example config fixed from the lcm_xl_lora_pokemon_blip config file in configs/lcm_lora/lcm_xl_lora_pokemon_blip.py:

from mmengine.config import read_base

from diffengine.engine.hooks import PeftSaveHook, VisualizationHook

with read_base():
    from .._base_.datasets.pokemon_blip_xl_pre_compute import *
    from .._base_.default_runtime import *
    from .._base_.models.lcm_xl_lora import *
    from .._base_.schedules.lcm_xl_50e import *


train_dataloader.update(batch_size=2)

optim_wrapper.update(
    optimizer=dict(lr=1e-5),
    accumulative_counts=2)

custom_hooks = [
    dict(
        type=VisualizationHook,
        prompt=["yoda pokemon"] * 4,
        height=1024,
        width=1024),
    dict(type=PeftSaveHook),
]

Run training

Run train

# single gpu
$ diffengine train ${CONFIG_FILE}
# Example
$ diffengine train lcm_xl_lora_pokemon_blip

# multi gpus
$ NPROC_PER_NODE=${GPU_NUM} diffengine train ${CONFIG_FILE}

Inference with diffusers

Once you have trained a model, specify the path to the saved model and utilize it for inference using the diffusers.pipeline module.

from pathlib import Path

import torch
from diffusers import DiffusionPipeline, AutoencoderKL, LCMScheduler
from peft import PeftModel

checkpoint = Path('work_dirs/lcm_xl_lora_pokemon_blip/step20850')
prompt = 'yoda pokemon'

vae = AutoencoderKL.from_pretrained(
    'madebyollin/sdxl-vae-fp16-fix',
    torch_dtype=torch.float16,
)
pipe = DiffusionPipeline.from_pretrained(
    'stabilityai/stable-diffusion-xl-base-1.0', vae=vae,
    scheduler=LCMScheduler.from_pretrained(
      'stabilityai/stable-diffusion-xl-base-1.0', subfolder="scheduler"),
    torch_dtype=torch.float16)
pipe.to('cuda')
pipe.unet = PeftModel.from_pretrained(pipe.unet, checkpoint / "unet", adapter_name="default")
if (checkpoint / "text_encoder_one").exists():
    pipe.text_encoder_one = PeftModel.from_pretrained(
        pipe.text_encoder_one, checkpoint / "text_encoder_one", adapter_name="default"
    )
if (checkpoint / "text_encoder_two").exists():
    pipe.text_encoder_one = PeftModel.from_pretrained(
        pipe.text_encoder_two, checkpoint / "text_encoder_two", adapter_name="default"
    )

image = pipe(
    prompt,
    num_inference_steps=4,
    guidance_scale=1.0,
    height=1024,
    width=1024,
).images[0]
image.save('demo.png')

Results Example

lcm_xl_lora_pokemon_blip

You can check configs/lcm_lora/README.md for more details.