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ultralytics/docs/en/reference/utils/callbacks/base.md
Glenn Jocher 3637f509dd
ultralytics 8.3.231 New Zensical docs refresh (#22761) 
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>
2025-11-23 19:53:50 +01:00

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description keywords
Discover the essential base callbacks in Ultralytics for training, validation, prediction, and exporting models efficiently. Ultralytics, base callbacks, training, validation, prediction, model export, ML, machine learning, deep learning

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