docs/en/reference/utils/callbacks/hub.md

metadata

description: >-
  Explore the detailed information on key Ultralytics callbacks such as
  on_pretrain_routine_end, on_model_save, on_train_start, and on_predict_start.
keywords: >-
  Ultralytics, callbacks, on_pretrain_routine_end, on_model_save,
  on_train_start, on_predict_start, hub, training

Reference for ultralytics/utils/callbacks/hub.py

!!! Note

This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/hub.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/hub.py). If you spot a problem please help fix it by [contributing](https://docs.ultralytics.com/help/contributing/) a [Pull Request](https://github.com/ultralytics/ultralytics/edit/main/ultralytics/utils/callbacks/hub.py) 🛠️. Thank you 🙏!

::: ultralytics.utils.callbacks.hub.on_pretrain_routine_end

::: ultralytics.utils.callbacks.hub.on_fit_epoch_end

::: ultralytics.utils.callbacks.hub.on_model_save

::: ultralytics.utils.callbacks.hub.on_train_end

::: ultralytics.utils.callbacks.hub.on_train_start

::: ultralytics.utils.callbacks.hub.on_val_start

::: ultralytics.utils.callbacks.hub.on_predict_start

::: ultralytics.utils.callbacks.hub.on_export_start