SPANetV2 Official

📜 History:

• (2026.05.02) Accepted in IEEE TPAMI2026 🥳
• (2025.03.31) arXiv2025: Spectral-Adaptive Modulation Networks for Visual Perception
• ICCV2023: SPANet: Frequency-balancing Token Mixer using Spectral Pooling Aggregation Modulation

🤖 It currently includes code and models for the following tasks:

• Image Classification
• Object Detection
• Semantic Segmentation
• Image Generation

Main results on ImageNet-1K

Please see image_classification for more details.

Model	Pretrain	Resolution	Top-1	#Params (M)	MACs (G)
SPANeV2-S18-pure	ImageNet-1K	224x224	83.4	29	4.2
SPANeV2-S18-hybrid	ImageNet-1K	224x224	83.9	27	4.2
SPANeV2-S36-pure	ImageNet-1K	224x224	84.4	44	8.1
SPANeV2-S36-hybrid	ImageNet-1K	224x224	84.7	41	8.1
SPANeV2-M36-pure	ImageNet-1K	224x224	84.9	61	13.7
SPANeV2-M36-hybrid	ImageNet-1K	224x224	85.3	58	13.6
SPANeV2-B36-pure	ImageNet-1K	224x224	85.0	100	24.3
SPANeV2-B36-hybrid	ImageNet-1K	224x224	85.6	100	23.9

With the scaled sigmoid for SRF

Model	Pretrain	Resolution	Top-1	#Params (M)	MACs (G)
SPANeV2-S18-pure	ImageNet-1K	224x224	83.5	29	4.2
SPANeV2-S18-hybrid	ImageNet-1K	224x224	-.-	27	4.2
SPANeV2-S36-pure	ImageNet-1K	224x224	-.-	44	8.1
SPANeV2-S36-hybrid	ImageNet-1K	224x224	84.9	41	8.1

Main results on COCO object detection and instance segmentation

Please see object_detection for more details.

Mask R-CNN 3x

Backbone	box mAP	mask mAP	MACs (G)
SPANet-S18-pure	48.0	42.9	255
SPANet-S18-hybrid	49.6	44.3	251

Cascade Mask R-CNN 3x

Backbone	box mAP	mask mAP	MACs (G)
SPANet-S18-pure	51.6	44.7	734
SPANet-S18-hybrid	52.8	45.7	729
SPANet-S36-pure	53.1	45.9	814
SPANet-S36-hybrid	53.8	46.4	806

Main results on ADE20K semantice segmentation

Please see semantic_segmentation for more details.

Semantic FPN

Backbone	mIoU	#params (M)	MACs (G)
SPANet-S18-pure	46.7	33	43
SPANet-S18-hybrid	47.8	31	48
SPANet-S36-pure	47.9	48	64
SPANet-S36-hybrid	48.6	45	74

UperNet

Backbone	mIoU	#params (M)	MACs (G)
SPANet-S18-pure	48.7	60	930
SPANet-S18-hybrid	49.1	58	925
SPANet-S36-pure	49.8	75	1012
SPANet-S36-hybrid	51.6	71	1004

⭐ Cite SPANetV2

If you find this repository useful, please give us stars and use the following BibTeX entry for citation.

@article{yun2026spectral,
  title={Spectral-Adaptive Modulation Networks for Visual Perception},
  author={Yun, Guhnoo and Yoo, Juhan and Kim, Kijung and Lee, Jeongho and Seo, Paul Hongsuck and Kim, Dong Hwan},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence},
  year={2026},
  publisher={IEEE}
}