A Python wrapper on Darknet. Compatible with YOLO V3.
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madhawav Merge pull request #30 from madhawav/fix-for-show-image
Fix for introduction of ms field in show_image
Latest commit 062de22 Aug 29, 2018



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A Python wrapper on Darknet. Compatible with latest YOLO V3. YOLO 3.0 is a real-time Object Detector by pjreddie.

OutputImage Image source: http://absfreepic.com/free-photos/download/crowded-cars-on-street-4032x2272_48736.html

What's New?

  • 2018-08-04 - Option to select the preferred GPU - pydarknet.set_cuda_device(GPU_INDEX)
  • 2018-04-23 - PyPI Release of RC12


  1. Python 3.5
  2. Numpy pip3 install numpy
  3. Cython pip3 install cython
  4. Optionally, OpenCV 3.x with Python bindings. (Tested on OpenCV 3.4.0)
    • You can use this script to automate Open CV 3.4 installation (Tested on Ubuntu 16.04).
    • Performance of this approach is better than not using OpenCV.
    • Installations from PyPI distributions does not use OpenCV.
NOTE: OpenCV 3.4.1 has a bug which causes Darknet to fail. Therefore this wrapper would not work with OpenCV 3.4.1.
More details are available at https://github.com/pjreddie/darknet/issues/502


Installation from PyPI distribution (as described below) is the most convenient approach if you intend to use yolo34py for your projects.

Installation of CPU Only Version

pip3 install yolo34py

Installation of GPU Accelerated Version

pip3 install yolo34py-gpu
NOTE: PyPI Deployments does not use OpenCV due to complexity involved in installation. 
To get best performance, it is recommended to install from source with OpenCV enabled.
NOTE: Make sure CUDA_HOME environment variable is set.

How to run demos in local machine?

  1. If you have not installed already, run python3 setup.py build_ext --inplace to install library locally.
  2. Download "yolov3" model file and config files using sh download_models.sh.
  3. Run python3 webcam_demo.py, python3 video_demo.py or python3 image_demo.py

How to run demo using docker?

  1. Navigate to docker directory.
  2. Copy sample images into the input directory. Or else run input/download_sample_images.sh
  3. Run sh run.sh
  4. Observe the outputs generated in output directory.

Installation from Source

  1. Set environment variables
  • To enable GPU acceleration, export GPU=1.
  • To enable OpenCV, export OPENCV=1
  1. Navigate to source root and run pip3 install . to install library.

Using a custom version of Darknet

  1. Set environment variable DARKNET_HOME to download location of darknet.
  3. Continue instructions for installation from source.

Having trouble?

Kindly raise your issues in the issues section of GitHub repository.

Like to contribute?

Feel free to send PRs or discuss on possible future improvements in issues section. Your contributions are most welcome!