text: Title: How does YOLO make use of the 3rd dimension (point visibility) for keypoints (pose) dataset ? How does that affect results ?
  Body: ### Search before asking
  
  - [x] I have searched the Ultralytics YOLO [issues](https://github.com/ultralytics/ultralytics/issues) and [discussions](https://github.com/orgs/ultralytics/discussions) and found no similar questions.
  
  
  ### Question
  
  Some dataset can specify additional info on the keypoints, such has not visible / occluded. How does YOLO use that information ? Can it also output that information on the inferred keypoints ?
  
  ### Additional
  
  _No response_