yolov3

(★ 10,594)

PyTorch implementation of YOLOv3, YOLOv3-SPP, and YOLOv3-tiny for real-time object detection with training, validation, inference, and multi-format export.

Owner Repos

ultralytics ★ 60,836

Ultralytics YOLO26, YOLO11, YOLOv8 — object detection, instance segmentation, semantic segmentation, image classification, pose estimation, object tracking

Python
yolov5 ★ 57,917

Ultralytics YOLOv5 in PyTorch for object detection, instance segmentation, classification, training, and export.

Python
JSON2YOLO ★ 1,230

Legacy JSON-to-YOLO dataset converter for COCO, LabelMe, Labelbox, VoTT, INFOLKS, and ATH annotations. Superseded by convert_coco() in the Ultralytics package.

Python
assets ★ 660

Shared Ultralytics logos, media, sample images, pretrained model weights, dataset artifacts, and release assets.
yolo-ios-app ★ 505

Ultralytics YOLO iOS app and Swift package for real-time Core ML inference across major computer vision tasks.

Swift
yolo-flutter-app ★ 477

Official Ultralytics YOLO Flutter plugin for real-time inference on Android and iOS across major vision tasks.

Dart

File Explorer

ZIP Download
  • .dockerignore
  • .gitignore
  • AGENTS.md
  • benchmarks.py
  • CITATION.cff
  • CLAUDE.md
  • CONTRIBUTING.md
  • detect.py
  • export.py
  • hubconf.py
  • LICENSE
  • pyproject.toml
  • README.md
  • README.zh-CN.md
  • requirements.txt
  • train.py
  • tutorial.ipynb
  • val.py

# Installation Guide

python
Prerequisites

Setup Steps

git clone https://github.com/ultralytics/yolov3

Clone the repository

cd yolov3

Navigate to the project directory

pip install -r requirements.txt

Install required packages

Key Commands

pip install -r requirements.txt

Install required python dependencies for the project.

python detect.py --weights yolov3.pt --source 0

Run object detection inference on various sources like images, videos, or webcams.

python train.py --data coco.yaml --epochs 300 --weights '' --cfg yolov3.yaml --batch-size 32

Train the YOLOv3 model using specified dataset and configuration.

python val.py --weights yolov3.pt --data coco.yaml

Evaluate the validation accuracy of the trained model.

python export.py --weights yolov3.pt --include onnx

Export the model to other formats like ONNX or TensorRT.

Pretrained weights are downloaded automatically on first use.

# Use via CDN

jsDelivr

jsDelivr serves any public GitHub repository as a CDN with zero setup. Pick a version and a file to get a ready-to-paste link and snippet.

Link
Example

Command Glossary

Commands referenced in this DOCs, explained below.

🔍

git clone

View Details ▼

Clone an existing repository.

git clone {{remote_repository_location}} {{path/to/directory}}

Clone an existing repository into a new directory (the default directory is the repository name):

git clone --recursive {{remote_repository_location}}

Clone an existing repository and its submodules:

git clone {{[-n|--no-checkout]}} {{remote_repository_location}}

Clone only the `.git` directory of an existing repository:

🔍

pip install

View Details ▼

Install Python packages.

pip install {{package1 package2 ...}}

Install one or more packages:

pip install {{package1 package2 ...}} {{[-U|--upgrade]}}

Upgrade all specified packages to the latest version, installing any that are not already present:

pip install {{package}}=={{version}}

Install a specific version of a package:

🔍

python

View Details ▼

Python language interpreter.

python

Start a REPL (interactive shell):

python {{path/to/file.py}}

Execute a specific Python file:

python -i {{path/to/file.py}}

Execute a specific Python file and start a REPL:

// repository documentation