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Omer Karisman

okaris

https://okaris.ai

AI & ML interests

GenAI

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new activity 26 days ago

okaris/omni-zero:report

published a model 6 months ago

inference-sh/CausVid

published a model 7 months ago

inference-sh/Wan2.2-TI2V-5B-LightX2V-Diffusers

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New activity in okaris/omni-zero 26 days ago

report

#17 opened 26 days ago by

tynwald111

published a model 6 months ago

inference-sh/CausVid

Updated Sep 12, 2025

published 3 models 7 months ago

replied to a-r-r-o-w's post 7 months ago

I see both first block cache and teacache referenced. Does this implementation also cover (can be used in place) for teacache? Thanks and amazing PR!

reacted to a-r-r-o-w's post with 🚀🧠🔥 7 months ago

Post

3497

Caching is an essential technique used in diffusion inference serving for speeding up image/video generations. Diffusers just added support for another caching method: First Block Cache - a technique developed by @chengzeyi building upon the ideas of TeaCache.

The idea in short is: if the model predictions do not vary much over successive inference steps, we can skip certain steps where the prediction difference is small. To figure out whether an inference step will make a significant improvement to the overall velocity/noise prediction, we calculate the relative difference of the output of the first transformer block at timestep $t$ with $t-1$, and compare it against a selected threshold. If the difference is lower than the threshold, we skip the step. A higher threshold will lead to more steps being skipped. However, skipping many steps is bad because it can throw off the model predictions, and so we need to test and select the threshold based on level of quality-speed tradeoff for every model we use it with.

Diffusers usage with CogView4:

import torch
from diffusers import CogView4Pipeline
from diffusers.hooks import apply_first_block_cache, FirstBlockCacheConfig

pipe = CogView4Pipeline.from_pretrained("THUDM/CogView4-6B", torch_dtype=torch.bfloat16)
pipe.to("cuda")

apply_first_block_cache(pipe.transformer, FirstBlockCacheConfig(threshold=0.2))

prompt = "A photo of an astronaut riding a horse on mars"
image = pipe(prompt, generator=torch.Generator().manual_seed(42)).images[0]
image.save("output.png")