| --- |
| description: Discover the essential base callbacks in Ultralytics for training, validation, prediction, and exporting models efficiently. |
| keywords: Ultralytics, base callbacks, training, validation, prediction, model export, ML, machine learning, deep learning |
| --- |
| |
| # Reference for `ultralytics/utils/callbacks/base.py` |
|
|
| !!! Note |
|
|
| This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/base.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/base.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/base.py) 🛠️. Thank you 🙏! |
| |
| <br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_pretrain_routine_start |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_pretrain_routine_end |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_train_start |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_train_epoch_start |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_train_batch_start |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.optimizer_step |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_before_zero_grad |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_train_batch_end |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_train_epoch_end |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_fit_epoch_end |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_model_save |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_train_end |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_params_update |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.teardown |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_val_start |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_val_batch_start |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_val_batch_end |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_val_end |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_predict_start |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_predict_batch_start |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_predict_batch_end |
| |
| <br><br><hr><br> |
| |
| ## ::: ultralytics.utils.callbacks.base.on_predict_postprocess_end |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_predict_end |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_export_start |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.on_export_end |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.get_default_callbacks |
|
|
| <br><br><hr><br> |
|
|
| ## ::: ultralytics.utils.callbacks.base.add_integration_callbacks |
|
|
| <br><br> |
|
|
