RT-DETRv2-S (PekingU/rtdetr_v2_r18vd, Apache-2.0) quantized with Kenosis — 128-image COCO calibration, no retraining. 45.7 AP (95.0% of FP32) from a single 32.7 MB file, on ONNX Runtime or OpenVINO, CPU or GPU, no accelerator required.

Accuracy

COCO val2017, 4,800 images (disjoint from the 128 calibration images), pycocotools bbox.

model	AP50:95	retention	size
FP32 baseline	48.1	—	81.0 MB
Kenosis quantized	45.7	95.0%	32.7 MB

Run

python

from huggingface_hub import hf_hub_download
import numpy as np, onnxruntime as ort
from PIL import Image
path = hf_hub_download("CoreEpoch/rtdetrv2-s-int8-onnx", "rtdetrv2_s_640_int8_kenosis.onnx")
sess = ort.InferenceSession(path, providers=["CPUExecutionProvider"])
img = Image.open("your_image.jpg").convert("RGB")
x = np.asarray(img.resize((640, 640), Image.BILINEAR), np.float32) / 255.0
logits, boxes = sess.run(None, {"input": x.transpose(2,0,1)[None]})
scores = 1.0 / (1.0 + np.exp(-logits[0]))
q, c = divmod(int(scores.argmax()), scores.shape[1])
print(f"class {c}, score {scores.max():.2f}, box {boxes[0][q]}")

Input 1x3x640x640, RGB, /255 (no mean/std). Outputs logits [1,300,80] (contiguous COCO-80 order) and boxes [1,300,4] (normalized cxcywh). run_detect.py / eval_coco.py reproduce the demo and table.

Integrity & license

rtdetrv2_s_640_int8_kenosis.onnx (32,666,936 B) — SHA-256 2FBEA12F3A66DA22BE0C0404F78D378F0D6F4C2F8107A5444EE00C6AB717974D. Apache-2.0 (base RT-DETRv2, Lv et al. 2024, retained). Quantized with Kenosis (patent pending) · coreepoch.dev