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description: Deep dive into Ultralytics callbacks. Learn how to use the _log_plots, on_fit_epoch_end, and on_train_end functions effectively.
keywords: Ultralytics, callbacks, _log_plots, on_fit_epoch_end, on_train_end
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# Reference for `ultralytics/utils/callbacks/wb.py`
!!! note
Full source code for this file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/wb.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/wb.py). Help us fix any issues you see by submitting a [Pull Request](https://docs.ultralytics.com/help/contributing/) 🛠️. Thank you 🙏!
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## ::: ultralytics.utils.callbacks.wb._log_plots
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## ::: ultralytics.utils.callbacks.wb.on_pretrain_routine_start
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## ::: ultralytics.utils.callbacks.wb.on_fit_epoch_end
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## ::: ultralytics.utils.callbacks.wb.on_train_epoch_end
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## ::: ultralytics.utils.callbacks.wb.on_train_end
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