SageAttention
Quantized Attention that achieves speedups of 2.1x and 2.7x compared to FlashAttention2 and xformers, respectively, without lossing end-to-end metrics across various models.
Stars: 153
SageAttention is an official implementation of an accurate 8-bit attention mechanism for plug-and-play inference acceleration. It is optimized for RTX4090 and RTX3090 GPUs, providing performance improvements for specific GPU architectures. The tool offers a technique called 'smooth_k' to ensure accuracy in processing FP16/BF16 data. Users can easily replace 'scaled_dot_product_attention' with SageAttention for faster video processing.
README:
This repository provides the official implementation of SageAttention.
SageAttention: Accurate 8-Bit Attention for Plug-and-play Inference Acceleration
Paper: https://arxiv.org/abs/2410.02367
Jintao Zhang, Jia Wei, Pengle Zhang, Jun Zhu, Jianfei Chen
python>=3.9
torch>=2.3.0
triton>=3.0.0
We recommend to install: (the kernel will be faster a little)
python>=3.11
torch>=2.4.0
triton-nightly
Install using pip:
pip install sageattention
Or compiling from source:
cd sageattention
pip install .
Note: SageAttention is currently optimized for RTX4090 and RTX3090 GPUs. Performance improvements may not be significant on other GPU architectures. We will progressively extend support to other GPUs.
from sageattention import sageattn
attn_output = sageattn(q, k, v, is_causal=False, smooth_k=True)
q, k, v
are FP16/BF16 type with the shape (batch_size, head_num, seq_len, head_dim)
. is_causal
determines the use of a causal mask. smooth_k
is a technique we proposed to ensure the accuracy. Disabling smooth_k
might slightly increase speed, but could compromise accuracy if the distribution of q, k, v
is irregular.
Note: sageattn() is an accurate implementation that integrating smoothing K, INT8 per-block quantization for
q, k
, and a FP16 accumulator for Matmul of $PV$. Support forhead_dim
values of64
,96
, and128
is currently available. Extended support for values 48, 72, and 256 will be available soon.
We can replace scaled_dot_product_attention
easily.
We will take Cogvideo as an example:
Just add the following codes and run!
from sageattention import sageattn
import torch.nn.functional as F
F.scaled_dot_product_attention = sageattn
Specifically,
cd example
python sageattn_cogvideo.py
You can get a lossless video in ./example
faster than by using python original_cogvideo.py
Note: The TOPS results refer only to the Attention Kernel, excluding the quantization and smoothing K.
If you use this code or find our work valuable, please cite:
@misc{zhang2024sageattentionaccurate8bitattention,
title={SageAttention: Accurate 8-Bit Attention for Plug-and-play Inference Acceleration},
author={Jintao Zhang and Jia wei and Pengle Zhang and Jun Zhu and Jianfei Chen},
year={2024},
eprint={2410.02367},
archivePrefix={arXiv},
primaryClass={cs.LG},
url={https://arxiv.org/abs/2410.02367},
}
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