Docs updates for HUB, YOLOv4, YOLOv7, NAS (#3174)

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/reference/yolo/v8/segment/predict.md

@@ -1,5 +1,6 @@
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 description: '"Use SegmentationPredictor in YOLOv8 for efficient object detection and segmentation. Explore Ultralytics YOLO Docs for more information."'
+keywords: Ultralytics YOLO, SegmentationPredictor, object detection, segmentation masks, predict
 ---
 
 # SegmentationPredictor
@@ -10,4 +11,4 @@ description: '"Use SegmentationPredictor in YOLOv8 for efficient object detectio
 # predict
 ---
 :::ultralytics.yolo.v8.segment.predict.predict
-<br><br>
+<br><br>

docs/reference/yolo/v8/segment/train.md

@@ -1,5 +1,6 @@
 ---
 description: Learn about SegmentationTrainer and Train in Ultralytics YOLO v8 for efficient object detection models. Improve your training with Ultralytics Docs.
+keywords: SegmentationTrainer, Ultralytics YOLO, object detection, segmentation, train, tutorial, guide, code examples
 ---
 
 # SegmentationTrainer
@@ -10,4 +11,4 @@ description: Learn about SegmentationTrainer and Train in Ultralytics YOLO v8 fo
 # train
 ---
 :::ultralytics.yolo.v8.segment.train.train
-<br><br>
+<br><br>

docs/reference/yolo/v8/segment/val.md

@@ -1,5 +1,6 @@
 ---
 description: Ensure segmentation quality on large datasets with SegmentationValidator. Review and visualize results with ease. Learn more at Ultralytics Docs.
+keywords: SegmentationValidator, YOLOv8, Ultralytics Docs, segmentation model, validation
 ---
 
 # SegmentationValidator
@@ -10,4 +11,4 @@ description: Ensure segmentation quality on large datasets with SegmentationVali
 # val
 ---
 :::ultralytics.yolo.v8.segment.val.val
-<br><br>
+<br><br>