AutoRound is an advanced quantization algorithm for low-bits LLM/VLM inference. It's tailored for a wide range of models. AutoRound adopts sign gradient descent to fine-tune rounding values and minmax values of weights in just 200 steps, which competes impressively against recent methods without introducing any additional inference overhead and keeping low tuning cost. The below image presents an overview of AutoRound. Check out our paper on arxiv for more details and quantized models in several Hugging Face Spaces, e.g. OPEA, Kaitchup and fbaldassarri.
- [2024/12] Many quantized LLMs/VLMs using AutoRound are released in OPEA Space
- [2024/11] We provide experimental support for VLM quantization, please check out the README
- [2024/11] We provide some tips and tricks for LLM&VLM quantization, please check out this blog
pip install auto-roundBuild from Source
pip install -vvv --no-build-isolation .A user guide detailing the full list of supported arguments is provided by calling auto-round -h on the terminal.
Set the format you want in format and
multiple formats exporting has been supported. Please check out step-by-step-instruction for
more details about calibration dataset or evaluation.
auto-round \
--model facebook/opt-125m \
--bits 4 \
--group_size 128 \
--format "auto_gptq,auto_round" \
--disable_eval \
--output_dir ./tmp_autoroundWe provide two recipes for best accuracy and fast running speed with low memory. Details as below.
Other Recipes
## best accuracy, 3X slower, low_gpu_mem_usage could save ~20G but ~30% slower
auto-round-best \
--model facebook/opt-125m \
--bits 4 \
--group_size 128 \
--low_gpu_mem_usage \
--disable_eval ## fast and low memory, 2-3X speedup, slight accuracy drop at W4G128
auto-round-fast \
--model facebook/opt-125m \
--bits 4 \
--group_size 128 \
--disable_eval AutoRound Format: This format is well-suited for CPU, HPU devices, 2 bits, as well as mixed-precision inference. [2,4] bits are supported. It also benefits from the Marlin kernel, which can boost inference performance notably. However, it has not yet gained widespread community adoption.
AutoGPTQ Format: This format is well-suited for symmetric quantization on CUDA devices and is widely adopted by the community, [2,3,4,8] bits are supported. It also benefits from the Marlin kernel, which can boost inference performance notably. However, the asymmetric kernel has issues that can cause considerable accuracy drops, particularly at 2-bit quantization and small models. Additionally, symmetric quantization tends to perform poorly at 2-bit precision.
AutoAWQ Format: This format is well-suited for asymmetric 4-bit quantization on CUDA devices and is widely adopted within the community, only 4-bits quantization is supported. It features specialized layer fusion tailored for Llama models.
from transformers import AutoModelForCausalLM, AutoTokenizer
model_name = "facebook/opt-125m"
model = AutoModelForCausalLM.from_pretrained(model_name)
tokenizer = AutoTokenizer.from_pretrained(model_name)
from auto_round import AutoRound
bits, group_size, sym = 4, 128, True
autoround = AutoRound(model, tokenizer, bits=bits, group_size=group_size, sym=sym)
## the best accuracy, 3X slower, low_gpu_mem_usage could save ~20G but ~30% slower
# autoround = AutoRound(model, tokenizer, nsamples=512, iters=1000, low_gpu_mem_usage=True, bits=bits, group_size=group_size, sym=sym)
## fast and low memory, 2-3X speedup, slight accuracy drop at W4G128
# autoround = AutoRound(model, tokenizer, nsamples=128, iters=200, seqlen=512, batch_size=4, bits=bits, group_size=group_size, sym=sym )
autoround.quantize()
output_dir = "./tmp_autoround"
## format= 'auto_round'(default in version>0.3.0), 'auto_gptq', 'auto_awq'
autoround.save_quantized(output_dir, format='auto_round', inplace=True) Detailed Hyperparameters
-
model: The PyTorch model to be quantized. -
tokenizer: An optional tokenizer for processing input data. If none, a dataset must be provided. -
bits (int): Number of bits for quantization (default is 4). -
group_size (int): Size of the quantization group (default is 128). -
sym (bool): Whether to use symmetric quantization (default is True). -
enable_quanted_input (bool): Whether to use the output of the previous quantized block as the input for the current block for tuning (default is True). -
enable_minmax_tuning (bool): Whether to enable weight min-max tuning (default is True). -
iters (int): Number of tuning iterations (default is 200). -
lr (float): The learning rate for rounding value (default is None, it will be set to 1.0/iters automatically). -
minmax_lr (float): The learning rate for min-max tuning (default is None, it will be set to lr automatically). -
nsamples (int): Number of samples for tuning (default is 128). -
seqlen (int): Data length of the sequence for tuning (default is 2048). -
batch_size (int): Batch size for training (default is 8). -
scale_dtype (str): The data type of quantization scale to be used (default is "float16"), different kernels have different choices. -
amp (bool): Whether to use automatic mixed precision (default is True). -
nblocks (int): Packing several blocks as one for tuning together (default is 1). -
gradient_accumulate_steps (int): Number of gradient accumulation steps (default is 1). -
low_gpu_mem_usage (bool): Whether to save GPU memory at the cost of ~20% more tuning time (default is False). -
dataset Union[str, list, tuple, torch.utils.data.DataLoader]: The dataset name for tuning (default is " NeelNanda/pile-10k"). Local json file and combination of datasets have been supported, e.g. " ./tmp.json,NeelNanda/pile-10k:train, mbpp:train+validation+test" -
layer_config (dict): Configuration for weight quantization (default is None), mainly for mixed bits or mixed precision. -
device: The device to be used for tuning. The default is set to 'auto', allowing for automatic detection.
This feature is experimental and may be subject to changes, including potential bug fixes, API modifications, or adjustments to default hype-parameters
By default, AutoRoundMLLM only quantizes the text module of VLMs and uses NeelNanda/pile-10k for calibration. To
quantize the entire model, you can enable quant_nontext_module by setting it to True, though support for this feature
is limited. For more information, please refer to the AutoRoundMLLM readme.
from auto_round import AutoRoundMLLM
from transformers import Qwen2VLForConditionalGeneration, AutoProcessor, AutoTokenizer
## load the model
model_name = "Qwen/Qwen2-VL-2B-Instruct"
model = Qwen2VLForConditionalGeneration.from_pretrained(
model_name, trust_remote_code=True)
tokenizer = AutoTokenizer.from_pretrained(model_name)
processor = AutoProcessor.from_pretrained(model_name, trust_remote_code=True)
## quantize the model
bits, group_size, sym = 4, 128, True
autoround = AutoRoundMLLM(model, tokenizer, processor,
bits=bits, group_size=group_size, sym=sym)
autoround.quantize()
# save the quantized model, set format='auto_gptq' to use AutoGPTQ format
output_dir = "./tmp_autoround"
autoround.save_quantized(output_dir, format='auto_round', inplace=True)Testing was conducted on the Nvidia A100 80G using the nightly version of PyTorch 2.6.0.dev20241029+cu124. Please note that data loading and packing costs have been excluded from the evaluation. We enable torch.compile for Torch 2.6, but not for 2.5 due to encountered issues.
To optimize GPU memory usage, in addition to activating low_gpu_mem_usage, you can set gradient_accumulate_steps=8
and a
batch_size=1, though this may increase tuning time.
The 3B and 14B models were evaluated on Qwen 2.5, the 8X7B model is Mixtral, while the remaining models utilized LLaMA 3.1.
| Torch version/Config W4G128 | 3B | 8B | 14B | 70B | 8X7B |
|---|---|---|---|---|---|
| 2.6 with torch compile | 7min 10GB |
12min 18GB |
23min 22GB |
120min 42GB |
28min 46GB |
| 2.6 with torch compile low_gpu_mem_usage=True |
12min 6GB |
19min 10GB |
33min 11GB |
140min 25GB |
38min 36GB |
| 2.6 with torch compile low_gpu_mem_usage=True gradient_accumulate_steps=8,bs=1 |
15min 3GB |
25min 6GB |
45min 7GB |
187min 19GB |
75min 36GB |
| 2.5 w/o torch compile | 8min 10GB |
16min 20GB |
30min 25GB |
140min 49GB |
50min 49GB |
Please run the quantization code first
CPU: pip install intel-extension-for-pytorch(much higher speed on Intel CPU) or pip install intel-extension-for-transformers,
HPU: docker image with Gaudi Software Stack is recommended. More details can be found in Gaudi Guide.
CUDA: no extra operations for sym quantization, for asym quantization, need to install auto-round from source
from transformers import AutoModelForCausalLM, AutoTokenizer
from auto_round import AutoRoundConfig
backend = "auto" ##cpu, hpu, cuda
quantization_config = AutoRoundConfig(
backend=backend
)
quantized_model_path = "./tmp_autoround"
model = AutoModelForCausalLM.from_pretrained(quantized_model_path,
device_map=backend.split(':')[0],
quantization_config=quantization_config)
tokenizer = AutoTokenizer.from_pretrained(quantized_model_path)
text = "There is a girl who likes adventure,"
inputs = tokenizer(text, return_tensors="pt").to(model.device)
print(tokenizer.decode(model.generate(**inputs, max_new_tokens=50)[0]))Evaluation
auto-round --model saved_quantized_model \
--eval \
--task lambada_openai \
--eval_bs 1from transformers import AutoModelForCausalLM, AutoTokenizer
quantized_model_path = "./tmp_autoround"
model = AutoModelForCausalLM.from_pretrained(quantized_model_path,
device_map="auto")
tokenizer = AutoTokenizer.from_pretrained(quantized_model_path)
text = "There is a girl who likes adventure,"
inputs = tokenizer(text, return_tensors="pt").to(model.device)
print(tokenizer.decode(model.generate(**inputs, max_new_tokens=50)[0]))AutoRound supports basically all the major large language models.
Please note that an asterisk (*) indicates third-party quantized models, which may lack accuracy data and use a different recipe. We greatly appreciate their efforts and encourage more users to share their models, as we cannot release most of the models ourselves.
AutoRound has been integrated into multiple repositories.
If you find AutoRound useful for your research, please cite our paper:
@article{cheng2023optimize,
title={Optimize Weight Rounding via Signed Gradient Descent for the Quantization of LLMs},
author={Cheng, Wenhua and Zhang, Weiwei and Shen, Haihao and Cai, Yiyang and He, Xin and Lv, Kaokao and Liu, Yi},
journal={arXiv preprint arXiv:2309.05516},
year={2023}
}