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description: Learn about Varifocal Loss and Keypoint Loss in Ultralytics YOLO for advanced bounding box and pose estimation. Visit our docs for more.
keywords: Ultralytics, YOLO, loss functions, object detection, keypoint detection, segmentation, classification
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## VarifocalLoss
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### ::: ultralytics.yolo.utils.loss.VarifocalLoss
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## FocalLoss
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### ::: ultralytics.yolo.utils.loss.FocalLoss
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## BboxLoss
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### ::: ultralytics.yolo.utils.loss.BboxLoss
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## KeypointLoss
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### ::: ultralytics.yolo.utils.loss.KeypointLoss
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## v8DetectionLoss
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### ::: ultralytics.yolo.utils.loss.v8DetectionLoss
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## v8SegmentationLoss
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### ::: ultralytics.yolo.utils.loss.v8SegmentationLoss
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## v8PoseLoss
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### ::: ultralytics.yolo.utils.loss.v8PoseLoss
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## v8ClassificationLoss
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### ::: ultralytics.yolo.utils.loss.v8ClassificationLoss
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