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--- |
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description: Discover the essential base callbacks in Ultralytics for training, validation, prediction, and exporting models efficiently. |
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keywords: Ultralytics, base callbacks, training, validation, prediction, model export, ML, machine learning, deep learning |
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--- |
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# Reference for `ultralytics/utils/callbacks/base.py` |
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!!! note |
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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 🙏! |
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<br> |
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## ::: ultralytics.utils.callbacks.base.on_pretrain_routine_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_pretrain_routine_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_train_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_train_epoch_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_train_batch_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.optimizer_step |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_before_zero_grad |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_train_batch_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_train_epoch_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_fit_epoch_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_model_save |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_train_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_params_update |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.teardown |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_val_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_val_batch_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_val_batch_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_val_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_predict_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_predict_batch_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_predict_batch_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_predict_postprocess_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_predict_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_export_start |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.on_export_end |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.get_default_callbacks |
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<br><br><hr><br> |
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## ::: ultralytics.utils.callbacks.base.add_integration_callbacks |
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<br><br>
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