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docs/en/reference/nn/modules/block.md

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+---
+description: Explore Ultralytics YOLO neural network modules, Proto to BottleneckCSP. Detailed explanation of each module with easy-to-follow code examples.
+keywords: YOLO, Ultralytics, neural network, nn.modules.block, Proto, HGBlock, SPPF, C2, C3, RepC3, C3Ghost, Bottleneck, BottleneckCSP
+---
+
+# Reference for `ultralytics/nn/modules/block.py`
+
+!!! Note
+
+    This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/nn/modules/block.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/nn/modules/block.py). If you spot a problem please help fix it by [contributing](https://docs.ultralytics.com/help/contributing/) a [Pull Request](https://github.com/ultralytics/ultralytics/edit/main/ultralytics/nn/modules/block.py) 🛠️. Thank you 🙏!
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.DFL
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.Proto
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.HGStem
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.HGBlock
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.SPP
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.SPPF
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.C1
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.C2
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.C2f
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.C3
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.C3x
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.RepC3
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.C3TR
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.C3Ghost
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.GhostBottleneck
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.Bottleneck
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.BottleneckCSP
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.ResNetBlock
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.ResNetLayer
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.MaxSigmoidAttnBlock
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.C2fAttn
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.ImagePoolingAttn
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.ContrastiveHead
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.BNContrastiveHead
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.RepBottleneck
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.RepCSP
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.RepNCSPELAN4
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.ADown
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.SPPELAN
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.Silence
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.CBLinear
+
+<br><br>
+
+## ::: ultralytics.nn.modules.block.CBFuse
+
+<br><br>