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description: Understand routines at the end of pre-training and training in Ultralytics. Elevate your MLflow callbacks expertise.
keywords: Ultralytics, MLflow, Callbacks, on_pretrain_routine_end, on_train_end, Machine Learning, Training
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# Reference for `ultralytics/utils/callbacks/mlflow.py`
!!! note
Full source code for this file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/mlflow.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/mlflow.py). Help us fix any issues you see by submitting a [Pull Request](https://docs.ultralytics.com/help/contributing/) πŸ› οΈ. Thank you πŸ™!
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## ::: ultralytics.utils.callbacks.mlflow.on_pretrain_routine_end
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## ::: ultralytics.utils.callbacks.mlflow.on_fit_epoch_end
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## ::: ultralytics.utils.callbacks.mlflow.on_train_end
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