ussoewwin/SAM3.1-HSWQ-ConvRot-INT8

SAM 3.1 Multiplex (HSWQ ConvRot INT8)

High-fidelity HSWQ ConvRot INT8 (Hybrid-Sensitivity-Weighted-Quantization) quantized weights for the SAM 3.1 Multiplex (Segment Anything Model 3.1) architecture.

• Technical Details & Quantization Framework: Hybrid-Sensitivity-Weighted-Quantization (HSWQ)
• ComfyUI Loader for ConvRot INT8: ComfyUI-HSWQ-Loader-and-Tools

📦 Model Details

Filename	Base Architecture	Precision / Format	File Size	Size Reduction vs FP16	Native ComfyUI Support	Status
sam3.1_multiplex_hswq_convrot_int8.safetensors	SAM 3.1 Multiplex	HSWQ ConvRot INT8 (int8_tensorwise)	~1,738.2 MB (1.74 GB)	~0.4% Reduction vs the ~1,745.5 MB (1.75 GB) FP16 source - 41 of the 221 runtime-live Linear layers are quantised, the rest of the checkpoint stays FP16	✅ Supported natively (UNetLoader)	Available

Sizes are decimal MB/GB computed from the published byte counts, and the reduction is computed from those same byte counts against the source file named in the same row.

🚀 Usage in ComfyUI

Model Placement

Download sam3.1_multiplex_hswq_convrot_int8.safetensors and place it in your ComfyUI models directory:

ComfyUI/models/unet/sam3.1_multiplex_hswq_convrot_int8.safetensors

Loading

1. Load the model using the standard UNetLoader (or Load Diffusion Model) node in ComfyUI, or use HSWQ SAM3 Loader from ComfyUI-HSWQ-Loader-and-Tools.
2. Connect the loaded model output directly into your SAM3 image / video segmentation workflow nodes.
3. ComfyUI automatically detects the comfy_quant header metadata and executes optimized INT8 Tensor Core operations natively.

🔒 Security

Backdoor audit. Each file's audit status - verdict strength, weight coverage, the record behind it, and the limits of what that measurement can show - is in Backdoor Audit Verdicts. The audit code, the procedure and the raw records are in the same repository.

📜 Credits & License

• Base Architecture & Model: Comfy-Org/sam3.1 / facebook/sam3.1 (Meta SAM / Segment Anything Team)
• Quantization Framework: HSWQ / ConvRot INT8 Pipeline
• License: SAM License (Meta SAM License)