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---
description: Learn how to use Ultralytics YOLO's built-in callbacks `on_pretrain_routine_start` and `on_train_epoch_end` for improved training performance.
keywords: Ultralytics, YOLO, callbacks, weights, biases, training
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## _log_plots
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### ::: ultralytics.yolo.utils.callbacks.wb._log_plots
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## on_pretrain_routine_start
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### ::: ultralytics.yolo.utils.callbacks.wb.on_pretrain_routine_start
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## on_fit_epoch_end
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### ::: ultralytics.yolo.utils.callbacks.wb.on_fit_epoch_end
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## on_train_epoch_end
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### ::: ultralytics.yolo.utils.callbacks.wb.on_train_epoch_end
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## on_train_end
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### ::: ultralytics.yolo.utils.callbacks.wb.on_train_end
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