Reference for ultralytics/utils/callbacks/base.py

!!! success "Improvements"

This page is sourced from [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/base.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/base.py). Have an improvement or example to add? Open a [Pull Request](https://docs.ultralytics.com/help/contributing/) — thank you! 🙏

::: ultralytics.utils.callbacks.base.on_pretrain_routine_start

::: ultralytics.utils.callbacks.base.on_pretrain_routine_end

::: ultralytics.utils.callbacks.base.on_train_start

::: ultralytics.utils.callbacks.base.on_train_epoch_start

::: ultralytics.utils.callbacks.base.on_train_batch_start

::: ultralytics.utils.callbacks.base.optimizer_step

::: ultralytics.utils.callbacks.base.on_before_zero_grad

::: ultralytics.utils.callbacks.base.on_train_batch_end

::: ultralytics.utils.callbacks.base.on_train_epoch_end

::: ultralytics.utils.callbacks.base.on_fit_epoch_end

::: ultralytics.utils.callbacks.base.on_model_save

::: ultralytics.utils.callbacks.base.on_train_end

::: ultralytics.utils.callbacks.base.on_params_update

::: ultralytics.utils.callbacks.base.teardown

::: ultralytics.utils.callbacks.base.on_val_start

::: ultralytics.utils.callbacks.base.on_val_batch_start

::: ultralytics.utils.callbacks.base.on_val_batch_end

::: ultralytics.utils.callbacks.base.on_val_end

::: ultralytics.utils.callbacks.base.on_predict_start

::: ultralytics.utils.callbacks.base.on_predict_batch_start

::: ultralytics.utils.callbacks.base.on_predict_batch_end

::: ultralytics.utils.callbacks.base.on_predict_postprocess_end

::: ultralytics.utils.callbacks.base.on_predict_end

::: ultralytics.utils.callbacks.base.on_export_start

::: ultralytics.utils.callbacks.base.on_export_end

::: ultralytics.utils.callbacks.base.get_default_callbacks

::: ultralytics.utils.callbacks.base.add_integration_callbacks