YOLOv3, YOLOv3-Ultralytics, and YOLOv3u
YOLOv3: This is the third version of the You Only Look Once (YOLO) object detection algorithm. Originally developed by Joseph Redmon, YOLOv3 improved on its predecessors by introducing features such as multiscale predictions and three different sizes of detection kernels.
YOLOv3-Ultralytics: This is Ultralytics' implementation of the YOLOv3 model. It reproduces the original YOLOv3 architecture and offers additional functionalities, such as support for more pre-trained models and easier customization options.
YOLOv3u: This is an updated version of YOLOv3-Ultralytics that incorporates the anchor-free, objectness-free split head used in YOLOv8 models. YOLOv3u maintains the same backbone and neck architecture as YOLOv3 but with the updated detection head from YOLOv8.
YOLOv3: Introduced the use of three different scales for detection, leveraging three different sizes of detection kernels: 13x13, 26x26, and 52x52. This significantly improved detection accuracy for objects of different sizes. Additionally, YOLOv3 added features such as multi-label predictions for each bounding box and a better feature extractor network.
YOLOv3-Ultralytics: Ultralytics' implementation of YOLOv3 provides the same performance as the original model but comes with added support for more pre-trained models, additional training methods, and easier customization options. This makes it more versatile and user-friendly for practical applications.
YOLOv3u: This updated model incorporates the anchor-free, objectness-free split head from YOLOv8. By eliminating the need for pre-defined anchor boxes and objectness scores, this detection head design can improve the model's ability to detect objects of varying sizes and shapes. This makes YOLOv3u more robust and accurate for object detection tasks.
YOLOv3, YOLOv3-Ultralytics, and YOLOv3u all support the following tasks:
- Object Detection
All three models support the following modes:
Below is a comparison of the performance of the three models. The performance is measured in terms of the Mean Average Precision (mAP) on the COCO dataset:
You can use YOLOv3 for object detection tasks using the Ultralytics repository. The following is a sample code snippet showing how to use YOLOv3 model for inference:
*.pt models as well as configuration
*.yaml files can be passed to the
YOLO() class to create a model instance in python:
from ultralytics import YOLO # Load a COCO-pretrained YOLOv3n model model = YOLO('yolov3n.pt') # Display model information (optional) model.info() # Train the model on the COCO8 example dataset for 100 epochs results = model.train(data='coco8.yaml', epochs=100, imgsz=640) # Run inference with the YOLOv3n model on the 'bus.jpg' image results = model('path/to/bus.jpg')
CLI commands are available to directly run the models:
Citations and Acknowledgements
If you use YOLOv3 in your research, please cite the original YOLO papers and the Ultralytics YOLOv3 repository:
Thank you to Joseph Redmon and Ali Farhadi for developing the original YOLOv3.