Roboflow

Roboflow is sooo good to generate data and then do Transfer Learning. It is free for open-source datasets.

It automatically does the Train-Val-Test Split for you, and export into data formats that work for YOLO.

https://blog.roboflow.com/roboflow-command-line-interface-for-computer-vision/ Easiest way is to do it through the CLI

npm i -g roboflow-cli