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24 lines
534 B
24 lines
534 B
---
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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.
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---
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# on_pretrain_routine_start
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---
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:::ultralytics.yolo.utils.callbacks.wb.on_pretrain_routine_start
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<br><br>
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# on_fit_epoch_end
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---
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:::ultralytics.yolo.utils.callbacks.wb.on_fit_epoch_end
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<br><br>
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# on_train_epoch_end
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---
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:::ultralytics.yolo.utils.callbacks.wb.on_train_epoch_end
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<br><br>
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# on_train_end
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---
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:::ultralytics.yolo.utils.callbacks.wb.on_train_end
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<br><br>
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