Object detection is arguably the most common Computer Vision task. It is applied to images and videos across various domains. However, action recognition is a tad different from object detection because it can be difficult to tell certain actions from a single image. It is hard to tell if a door is being opened or closed or tell what martial art technique is being executed from an image.
In this tutorial, the MMAction2 framework will be used to train an action recognition model to detect what Judo throws are being performed in videos. While it will be fun seeing Machine Learning techniques applied to Martial Arts, the knowledge and techniques applied can easily be generalized to other action recognition tasks where simple object detection does not suffice.