Ruichen0424/IS-SNN

Intrinsically Stable Spiking Neural Networks: Overcoming the Performance Barrier in the Absence of Batch Normalization

🚀 Introduction

This is the official model repository of the paper Intrinsically Stable Spiking Neural Networks: Overcoming the Performance Barrier in the Absence of Batch Normalization, accepted at ECCV 2026.

✨ Key Highlights

• ⚡ Zero-Runtime-Overhead SNN: Removes all dynamic batch normalization (BN) layers. By folding weight standardization operations offline, it restores a pure, hardware-friendly accumulation-only (addition-only) inference datapath.
• 📉 Solves Firing-Rate Decay: Addresses the fundamental issue of catastrophic firing-rate decay/saturation in BN-free SNNs through theoretical Topology-Aware Weight Standardization and Modified Residual Connections.
• 🏆 Scalable & Deep SNNs: Breaks the depth limitations of prior normalization-free SNNs, delivering high-performance training across deep VGG, ResNet, and Spiking Transformer architectures.
• 📊 State-of-the-Art Accuracy: Reaches a competitive 68.05% top-1 accuracy on ImageNet (T=4), matching or outperforming computationally heavy dynamic BN methods.
• 🔋 Edge-Hardware Friendly: Reduces FPGA lookup table (LUT) resource consumption for neuron implementations by 96.4%, paving the way for ultra-low-power neuromorphic deployment.

📄 Abstract

The performance of deep spiking neural networks (SNNs) often relies on batch normalization (BN). However, the advanced dynamic BN variants used in state-of-the-art models introduce runtime multiplications, which weaken the hardware-efficiency motivation of SNNs. To address this tension, we identify catastrophic firing-rate decay as a primary cause of severe performance degradation in normalization-free SNNs. Guided by this insight, this work proposes the Intrinsically Stable SNN (IS-SNN) architecture, which removes activation-normalization layers by enforcing signal homeostasis through topology-aware weight standardization and modified residual connections. By folding the standardization operations into static weights offline, IS-SNN removes the runtime statistics tracking and multiplications introduced by activation normalization, restoring an accumulation-oriented inference datapath. Comprehensive experiments show that IS-SNN achieves performance competitive with or superior to computationally expensive dynamic BN techniques across VGG, ResNet, and Transformer-based models. Notably, it achieves a competitive accuracy of 68.05% on ImageNet and overcomes the severe depth limitations of prior BN-free attempts. Together with a 96.4% reduction in FPGA lookup table resource consumption for neuron implementations, these results support IS-SNN as a practical framework for building accurate and hardware-friendly deep neuromorphic systems.

🛠️ Requirements

• python==3.10
• numpy==1.23.5
• spikingjelly==0.0.0.0.14
• torch==2.2.0
• torchvision==0.17.0
• timm==1.0.7

Environment Setup

We recommend using Anaconda to create a virtual environment:

conda create -n issnn python=3.10
conda activate issnn

Install PyTorch and dependencies:

# Install PyTorch (Choose based on your CUDA version)
# CUDA 11.8
conda install pytorch==2.2.0 torchvision==0.17.0 torchaudio==2.2.0 pytorch-cuda=11.8 -c pytorch -c nvidia

# Install SpikingJelly and timm
pip install timm==1.0.7
pip install spikingjelly==0.0.0.0.14

💻 Usage

Training on the CIFAR-10 dataset with AMP and Mixup/Cutmix:

CUDA_VISIBLE_DEVICES=0 \
python train.py --batch_size 128 --dataset_path '/ssd/Datasets/CIFAR10/' --dataset 'cifar10'\
                --class_number 10 --epochs 256 --lr 0.02 --weight_decay 5e-4 --amp\
                --timestep 4 --alpha 0.5 --mixup --workers 4 --print_freq 30 --name 'CIFAR10'

Training on the ImageNet dataset with AMP:

python train.py --batch_size 256 --dataset_path '/ssd/Datasets/ImageNet/' --dataset 'imagenet'\
                --class_number 1000 --epochs 128 --lr 0.2 --weight_decay 0 --amp\
                --timestep 4 --alpha 0.5 --workers 16 --print_freq 200 --name 'ImageNet'\
                --multiprocessing_distributed

📊 Main Results

Here is the performance summary of IS-SNN across various standard datasets and network architectures. By removing activation-normalization layers, IS-SNN achieves competitive accuracy with zero runtime normalization overhead.

Dataset	Architecture	Timestep	Accuracy (%)
ImageNet	SEW-ResNet-34	4	68.05
CIFAR-10	VGG-11	4	95.06
	SEW-ResNet-19	6 / 4 / 2	96.12 / 96.02 / 95.65
CIFAR-100	VGG-11	4	77.13
	SEW-ResNet-19	6 / 4 / 2	80.72 / 79.97 / 79.03
DVS-Gesture	SEW-7B-Net	16	96.88

📜 Citation

If you find our code useful for your research, or use the IS-SNN architecture, please consider citing:

@article{ma2026intrinsically,
  title={Intrinsically Stable Spiking Neural Networks: Overcoming the Performance Barrier in the Absence of Batch Normalization},
  author={Ma, Ruichen and Zhang, Xiaoyang and Bai, Jian and Qiao, Guanchao and Meng, Liwei and Ning, Ning and Liu, Yang and Hu, Shaogang},
  journal={arXiv preprint arXiv:2606.31695},
  year={2026}
}