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

metadata

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 🙏!

::: ultralytics.nn.modules.block.DFL

::: ultralytics.nn.modules.block.Proto

::: ultralytics.nn.modules.block.HGStem

::: ultralytics.nn.modules.block.HGBlock

::: ultralytics.nn.modules.block.SPP

::: ultralytics.nn.modules.block.SPPF

::: ultralytics.nn.modules.block.C1

::: ultralytics.nn.modules.block.C2

::: ultralytics.nn.modules.block.C2f

::: ultralytics.nn.modules.block.C3

::: ultralytics.nn.modules.block.C3x

::: ultralytics.nn.modules.block.RepC3

::: ultralytics.nn.modules.block.C3TR

::: ultralytics.nn.modules.block.C3Ghost

::: ultralytics.nn.modules.block.GhostBottleneck

::: ultralytics.nn.modules.block.Bottleneck

::: ultralytics.nn.modules.block.BottleneckCSP

::: ultralytics.nn.modules.block.ResNetBlock

::: ultralytics.nn.modules.block.ResNetLayer

::: ultralytics.nn.modules.block.MaxSigmoidAttnBlock

::: ultralytics.nn.modules.block.C2fAttn

::: ultralytics.nn.modules.block.ImagePoolingAttn

::: ultralytics.nn.modules.block.ContrastiveHead

::: ultralytics.nn.modules.block.BNContrastiveHead

::: ultralytics.nn.modules.block.RepBottleneck

::: ultralytics.nn.modules.block.RepCSP

::: ultralytics.nn.modules.block.RepNCSPELAN4

::: ultralytics.nn.modules.block.ADown

::: ultralytics.nn.modules.block.SPPELAN

::: ultralytics.nn.modules.block.Silence

::: ultralytics.nn.modules.block.CBLinear

::: ultralytics.nn.modules.block.CBFuse