Jaccard Index / Intersection over Union

IoU is a measure of the overlap between two bounding boxes (usually between prediction and ground truth), used a lot in Object Detection.

Higher IoU indicates the predicted bounding box coordinates closely resembles the ground truth box coordinates.

The Jaccard index, also known as the Jaccard similarity coefficient, is a statistic used for gauging the similarity and diversity of sample sets.

However, they are identical in generally taking the ratio of Intersection over Union

3D IoU??

For Lidar Detection, they also need to measure IoU.

Dice Coefficient

Found from here: https://www.kaggle.com/competitions/severstal-steel-defect-detection/overview/evaluation