description: Learn about the BaseTrainer class in the Ultralytics library. From training control, customization to advanced usage.

keywords: Ultralytics, BaseTrainer, Machine Learning, Training Control, Python library

Reference for `ultralytics/engine/trainer.py`

!!! note

Full source code for this file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/engine/trainer.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/engine/trainer.py). Help us fix any issues you see by submitting a [Pull Request](https://docs.ultralytics.com/help/contributing/) 🛠️. Thank you 🙏!

::: ultralytics.engine.trainer.BaseTrainer