YOLOv11改进 | Conv/卷积篇 | 2024最新线性可变形卷积LDConv替换传统下采样二次创新C3k2（附代码 + 修改方式）

一、本文介绍

本文给大家带来的最新改进机制是利用 2024 最新的线性 可变形卷积 LDConv 替换YOLOv11的传统 下采样 操作（值得一提的是这个作者和RFAConv是同一个作者），介绍了一种新型的卷积操作——线性可变形卷积（LDConv）。LDConv 旨在解决标准卷积操作的局限性，标准卷积在固定形状和大小的局部窗口中进行采样，难以动态适应不同物体的形状。可变形卷积（Deformable Conv）虽然允许灵活的采样位置，但其参数数量随着卷积核大小呈平方增长，计算效率较低。 LDConv 提供了比可变形卷积更大的灵活性 ， 允许卷积核的参数数量呈线性增长，从而克服了可变形卷积参数数量平方增长的问题 ， 该方法可以起到轻量化的作用 。

欢迎大家订阅我的专栏一起学习YOLO！

目录

一、本文介绍

二、原理介绍

三、核心代码

四、添加方法

4.1 修改一

4.2 修改二

4.3 修改三

4.4 修改四

五、正式训练

5.1 yaml文件1

5.2 yaml文件2

5.3 yaml文件3

5.4 训练代码

5.5 训练过程截图

五、本文总结

二、原理介绍

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官方论文地址： 官方论文地址点击此处即可跳转

官方代码地址： 官方代码地址点击此处即可跳转

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这篇文章题为《LDConv: 用于改进卷积神经网络的线性可变形卷积》 ，介绍了一种新型的 卷积操作 ——线性可变形卷积（LDConv）。LDConv 旨在解决标准卷积操作的局限性，标准卷积在固定形状和大小的局部窗口中进行采样，难以动态适应不同物体的形状。可变形卷积（Deformable Conv）虽然允许灵活的采样位置，但其参数数量随着卷积核大小呈平方增长，计算效率较低。

主要内容与原理：
1. 标准卷积的局限性：传统的 卷积神经网络 （CNN）使用固定的方形卷积核，无法动态调整以适应变化的目标形状，这限制了网络从不同空间位置捕捉信息的能力。

2. 可变形卷积（Deformable Conv）：可变形卷积通过引入偏移量来调整采样网格，使得卷积核能够灵活地适应物体的形状。然而，其参数数量依然随卷积核的增大而平方增长，计算效率较低。

3. LDConv的引入：
- LDConv 提供了比可变形卷积更大的灵活性，允许卷积核的参数数量呈线性增长，从而克服了可变形卷积参数数量平方增长的问题。
- 它引入了一种坐标生成 算法 ，可以为任意大小的卷积核生成不同的初始采样位置。
- 通过偏移量动态调整采样形状，使卷积核能够更精确地适应目标形状，从而提高特征提取效率。

4.主要贡献：
- LDConv 为参数数量和卷积核大小提供了更多的灵活性，能够在网络开销和性能之间实现更好的平衡。
- 它可用于目标检测等 计算机视觉 任务，实验证明其在COCO2017、VOC 和 VisDrone-DET2021 数据集上表现优越。

5. 目标检测实验：在多个数据集上的实验表明，LDConv 在目标检测任务中提升了CNN的性能，尤其是在处理大目标时，得益于其灵活的采样形状调整能力。

6. 应用与灵活性：
- LDConv 可以替换传统的卷积操作，提升网络性能的同时，不显著增加计算成本。
- 该方法是一种即插即用的卷积操作，能轻松集成到现有 模型 中，并提高在各种任务中的表现 （本文用于替换YOLOv8中的Conv） 。
- LDConv 还可以用于其他模块（如 FasterBlock 和 GSBottleneck），进一步提高网络效率并减少参数增长 （二次创新） 。

该论文强调，LDConv 通过灵活调整卷积核的形状和大小，提供了比现有方法（如标准卷积和可变形卷积）更好的计算效率和网络性能的平衡。

三、核心代码

代码的使用方式看章节四！ 

  1. import math
  2. import torch
  3. import torch.nn as nn
  4. from einops import rearrange
  5.  
  6. __all__ = ['LDConv', 'C3k2_LDConv1', 'C3k2_LDConv2']
  7.  
  8. class LDConv(nn.Module):
  9.     def __init__(self, inc, outc, num_param, stride=1, bias=None):
  10.         super(LDConv, self).__init__()
  11.         self.num_param = num_param
  12.         self.stride = stride
  13.         self.conv = nn.Sequential(nn.Conv2d(inc, outc, kernel_size=(num_param, 1), stride=(num_param, 1), bias=bias),
  14.                                   nn.BatchNorm2d(outc),
  15.                                   nn.SiLU())  # the conv adds the BN and SiLU to compare original Conv in YOLOv5.
  16.         self.p_conv = nn.Conv2d(inc, 2 * num_param, kernel_size=3, padding=1, stride=stride)
  17.         nn.init.constant_(self.p_conv.weight, 0)
  18.         self.p_conv.register_full_backward_hook(self._set_lr)
  19.  
  20.     @staticmethod
  21.     def _set_lr(module, grad_input, grad_output):
  22.         grad_input = (grad_input[i] * 0.1 for i in range(len(grad_input)))
  23.         grad_output = (grad_output[i] * 0.1 for i in range(len(grad_output)))
  24.  
  25.     def forward(self, x):
  26.         # N is num_param.
  27.         offset = self.p_conv(x)
  28.         dtype = offset.data.type()
  29.         N = offset.size(1) // 2
  30.         # (b, 2N, h, w)
  31.         p = self._get_p(offset, dtype)
  32.  
  33.         # (b, h, w, 2N)
  34.         p = p.contiguous().permute(0, 2, 3, 1)
  35.         q_lt = p.detach().floor()
  36.         q_rb = q_lt + 1
  37.  
  38.         q_lt = torch.cat([torch.clamp(q_lt[..., :N], 0, x.size(2) - 1), torch.clamp(q_lt[..., N:], 0, x.size(3) - 1)],
  39.                          dim=-1).long()
  40.         q_rb = torch.cat([torch.clamp(q_rb[..., :N], 0, x.size(2) - 1), torch.clamp(q_rb[..., N:], 0, x.size(3) - 1)],
  41.                          dim=-1).long()
  42.         q_lb = torch.cat([q_lt[..., :N], q_rb[..., N:]], dim=-1)
  43.         q_rt = torch.cat([q_rb[..., :N], q_lt[..., N:]], dim=-1)
  44.  
  45.         # clip p
  46.         p = torch.cat([torch.clamp(p[..., :N], 0, x.size(2) - 1), torch.clamp(p[..., N:], 0, x.size(3) - 1)], dim=-1)
  47.  
  48.         # bilinear kernel (b, h, w, N)
  49.         g_lt = (1 + (q_lt[..., :N].type_as(p) - p[..., :N])) * (1 + (q_lt[..., N:].type_as(p) - p[..., N:]))
  50.         g_rb = (1 - (q_rb[..., :N].type_as(p) - p[..., :N])) * (1 - (q_rb[..., N:].type_as(p) - p[..., N:]))
  51.         g_lb = (1 + (q_lb[..., :N].type_as(p) - p[..., :N])) * (1 - (q_lb[..., N:].type_as(p) - p[..., N:]))
  52.         g_rt = (1 - (q_rt[..., :N].type_as(p) - p[..., :N])) * (1 + (q_rt[..., N:].type_as(p) - p[..., N:]))
  53.  
  54.         # resampling the features based on the modified coordinates.
  55.         x_q_lt = self._get_x_q(x, q_lt, N)
  56.         x_q_rb = self._get_x_q(x, q_rb, N)
  57.         x_q_lb = self._get_x_q(x, q_lb, N)
  58.         x_q_rt = self._get_x_q(x, q_rt, N)
  59.  
  60.         # bilinear
  61.         x_offset = g_lt.unsqueeze(dim=1) * x_q_lt + \
  62.                    g_rb.unsqueeze(dim=1) * x_q_rb + \
  63.                    g_lb.unsqueeze(dim=1) * x_q_lb + \
  64.                    g_rt.unsqueeze(dim=1) * x_q_rt
  65.  
  66.         x_offset = self._reshape_x_offset(x_offset, self.num_param)
  67.         out = self.conv(x_offset)
  68.  
  69.         return out
  70.  
  71.     # generating the inital sampled shapes for the LDConv with different sizes.
  72.     def _get_p_n(self, N, dtype):
  73.         base_int = round(math.sqrt(self.num_param))
  74.         row_number = self.num_param // base_int
  75.         mod_number = self.num_param % base_int
  76.         p_n_x, p_n_y = torch.meshgrid(
  77.             torch.arange(0, row_number),
  78.             torch.arange(0, base_int))
  79.         p_n_x = torch.flatten(p_n_x)
  80.         p_n_y = torch.flatten(p_n_y)
  81.         if mod_number > 0:
  82.             mod_p_n_x, mod_p_n_y = torch.meshgrid(
  83.                 torch.arange(row_number, row_number + 1),
  84.                 torch.arange(0, mod_number))
  85.  
  86.             mod_p_n_x = torch.flatten(mod_p_n_x)
  87.             mod_p_n_y = torch.flatten(mod_p_n_y)
  88.             p_n_x, p_n_y = torch.cat((p_n_x, mod_p_n_x)), torch.cat((p_n_y, mod_p_n_y))
  89.         p_n = torch.cat([p_n_x, p_n_y], 0)
  90.         p_n = p_n.view(1, 2 * N, 1, 1).type(dtype)
  91.         return p_n
  92.  
  93.     # no zero-padding
  94.     def _get_p_0(self, h, w, N, dtype):
  95.         p_0_x, p_0_y = torch.meshgrid(
  96.             torch.arange(0, h * self.stride, self.stride),
  97.             torch.arange(0, w * self.stride, self.stride))
  98.  
  99.         p_0_x = torch.flatten(p_0_x).view(1, 1, h, w).repeat(1, N, 1, 1)
  100.         p_0_y = torch.flatten(p_0_y).view(1, 1, h, w).repeat(1, N, 1, 1)
  101.         p_0 = torch.cat([p_0_x, p_0_y], 1).type(dtype)
  102.  
  103.         return p_0
  104.  
  105.     def _get_p(self, offset, dtype):
  106.         N, h, w = offset.size(1) // 2, offset.size(2), offset.size(3)
  107.  
  108.         # (1, 2N, 1, 1)
  109.         p_n = self._get_p_n(N, dtype)
  110.         # (1, 2N, h, w)
  111.         p_0 = self._get_p_0(h, w, N, dtype)
  112.         p = p_0 + p_n + offset
  113.         return p
  114.  
  115.     def _get_x_q(self, x, q, N):
  116.         b, h, w, _ = q.size()
  117.         padded_w = x.size(3)
  118.         c = x.size(1)
  119.         # (b, c, h*w)
  120.         x = x.contiguous().view(b, c, -1)
  121.  
  122.         # (b, h, w, N)
  123.         index = q[..., :N] * padded_w + q[..., N:]  # offset_x*w + offset_y
  124.         # (b, c, h*w*N)
  125.         index = index.contiguous().unsqueeze(dim=1).expand(-1, c, -1, -1, -1).contiguous().view(b, c, -1)
  126.  
  127.         x_offset = x.gather(dim=-1, index=index).contiguous().view(b, c, h, w, N)
  128.  
  129.         return x_offset
  130.  
  131.     #  Stacking resampled features in the row direction.
  132.     @staticmethod
  133.     def _reshape_x_offset(x_offset, num_param):
  134.         b, c, h, w, n = x_offset.size()
  135.         # using Conv3d
  136.         # x_offset = x_offset.permute(0,1,4,2,3), then Conv3d(c,c_out, kernel_size =(num_param,1,1),stride=(num_param,1,1),bias= False)
  137.         # using 1 × 1 Conv
  138.         # x_offset = x_offset.permute(0,1,4,2,3), then, x_offset.view(b,c×num_param,h,w)  finally, Conv2d(c×num_param,c_out, kernel_size =1,stride=1,bias= False)
  139.         # using the column conv as follow， then, Conv2d(inc, outc, kernel_size=(num_param, 1), stride=(num_param, 1), bias=bias)
  140.  
  141.         x_offset = rearrange(x_offset, 'b c h w n -> b c (h n) w')
  142.         return x_offset
  143.  
  144.  
  145.  
  146. class Bottleneck(nn.Module):
  147.     """Standard bottleneck."""
  148.  
  149.     def __init__(self, c1, c2, shortcut=True, g=1, k=(3, 3), e=0.5):
  150.         """Initializes a standard bottleneck module with optional shortcut connection and configurable parameters."""
  151.         super().__init__()
  152.         c_ = int(c2 * e)  # hidden channels
  153.         self.cv1 = Conv(c1, c_, k[0], 1)
  154.         self.cv2 = Conv(c_, c2, k[1], 1, g=g)
  155.         self.add = shortcut and c1 == c2
  156.  
  157.     def forward(self, x):
  158.         """Applies the YOLO FPN to input data."""
  159.         return x + self.cv2(self.cv1(x)) if self.add else self.cv2(self.cv1(x))
  160.  
  161.  
  162. class Bottleneck_LDConv(nn.Module):
  163.     # Standard bottleneck with DCN
  164.     def __init__(self, c1, c2, shortcut=True, g=1, k=(3, 3), e=0.5):  # ch_in, ch_out, shortcut, groups, kernels, expand
  165.         super().__init__()
  166.         c_ = int(c2 * e)  # hidden channels
  167.  
  168.         self.cv1 = Conv(c1, c_, k[0], 1)
  169.         self.cv2 = LDConv(c_, c2, 3)
  170.         self.add = shortcut and c1 == c2
  171.  
  172.     def forward(self, x):
  173.         return x + self.cv2(self.cv1(x)) if self.add else self.cv2(self.cv1(x))
  174.  
  175. def autopad(k, p=None, d=1):  # kernel, padding, dilation
  176.     """Pad to 'same' shape outputs."""
  177.     if d > 1:
  178.         k = d * (k - 1) + 1 if isinstance(k, int) else [d * (x - 1) + 1 for x in k]  # actual kernel-size
  179.     if p is None:
  180.         p = k // 2 if isinstance(k, int) else [x // 2 for x in k]  # auto-pad
  181.     return p
  182.  
  183.  
  184.  
  185. class Conv(nn.Module):
  186.     """Standard convolution with args(ch_in, ch_out, kernel, stride, padding, groups, dilation, activation)."""
  187.     default_act = nn.SiLU()  # default activation
  188.  
  189.     def __init__(self, c1, c2, k=1, s=1, p=None, g=1, d=1, act=True):
  190.         """Initialize Conv layer with given arguments including activation."""
  191.         super().__init__()
  192.         self.conv = nn.Conv2d(c1, c2, k, s, autopad(k, p, d), groups=g, dilation=d, bias=False)
  193.         self.bn = nn.BatchNorm2d(c2)
  194.         self.act = self.default_act if act is True else act if isinstance(act, nn.Module) else nn.Identity()
  195.  
  196.     def forward(self, x):
  197.         """Apply convolution, batch normalization and activation to input tensor."""
  198.         return self.act(self.bn(self.conv(x)))
  199.  
  200.     def forward_fuse(self, x):
  201.         """Perform transposed convolution of 2D data."""
  202.         return self.act(self.conv(x))
  203.  
  204.  
  205. class C2f(nn.Module):
  206.     """Faster Implementation of CSP Bottleneck with 2 convolutions."""
  207.  
  208.     def __init__(self, c1, c2, n=1, shortcut=False, g=1, e=0.5):
  209.         """Initializes a CSP bottleneck with 2 convolutions and n Bottleneck blocks for faster processing."""
  210.         super().__init__()
  211.         self.c = int(c2 * e)  # hidden channels
  212.         self.cv1 = Conv(c1, 2 * self.c, 1, 1)
  213.         self.cv2 = Conv((2 + n) * self.c, c2, 1)  # optional act=FReLU(c2)
  214.         self.m = nn.ModuleList(Bottleneck(self.c, self.c, shortcut, g, k=((3, 3), (3, 3)), e=1.0) for _ in range(n))
  215.  
  216.     def forward(self, x):
  217.         """Forward pass through C2f layer."""
  218.         y = list(self.cv1(x).chunk(2, 1))
  219.         y.extend(m(y[-1]) for m in self.m)
  220.         return self.cv2(torch.cat(y, 1))
  221.  
  222.     def forward_split(self, x):
  223.         """Forward pass using split() instead of chunk()."""
  224.         y = list(self.cv1(x).split((self.c, self.c), 1))
  225.         y.extend(m(y[-1]) for m in self.m)
  226.         return self.cv2(torch.cat(y, 1))
  227.  
  228. class C3(nn.Module):
  229.     """CSP Bottleneck with 3 convolutions."""
  230.  
  231.     def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5):
  232.         """Initialize the CSP Bottleneck with given channels, number, shortcut, groups, and expansion values."""
  233.         super().__init__()
  234.         c_ = int(c2 * e)  # hidden channels
  235.         self.cv1 = Conv(c1, c_, 1, 1)
  236.         self.cv2 = Conv(c1, c_, 1, 1)
  237.         self.cv3 = Conv(2 * c_, c2, 1)  # optional act=FReLU(c2)
  238.         self.m = nn.Sequential(*(Bottleneck(c_, c_, shortcut, g, k=((1, 1), (3, 3)), e=1.0) for _ in range(n)))
  239.  
  240.     def forward(self, x):
  241.         """Forward pass through the CSP bottleneck with 2 convolutions."""
  242.         return self.cv3(torch.cat((self.m(self.cv1(x)), self.cv2(x)), 1))
  243.  
  244. class C3k(C3):
  245.     """C3k is a CSP bottleneck module with customizable kernel sizes for feature extraction in neural networks."""
  246.  
  247.     def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5, k=3):
  248.         """Initializes the C3k module with specified channels, number of layers, and configurations."""
  249.         super().__init__(c1, c2, n, shortcut, g, e)
  250.         c_ = int(c2 * e)  # hidden channels
  251.         # self.m = nn.Sequential(*(RepBottleneck(c_, c_, shortcut, g, k=(k, k), e=1.0) for _ in range(n)))
  252.         self.m = nn.Sequential(*(Bottleneck(c_, c_, shortcut, g, k=(k, k), e=1.0) for _ in range(n)))
  253.  
  254. class C3kLDConv(C3):
  255.     """C3k is a CSP bottleneck module with customizable kernel sizes for feature extraction in neural networks."""
  256.  
  257.     def __init__(self, c1, c2, n=1, shortcut=True, g=1, e=0.5, k=3):
  258.         """Initializes the C3k module with specified channels, number of layers, and configurations."""
  259.         super().__init__(c1, c2, n, shortcut, g, e)
  260.         c_ = int(c2 * e)  # hidden channels
  261.         # self.m = nn.Sequential(*(RepBottleneck(c_, c_, shortcut, g, k=(k, k), e=1.0) for _ in range(n)))
  262.         self.m = nn.Sequential(*(Bottleneck_LDConv(c_, c_, shortcut, g, k=(k, k), e=1.0) for _ in range(n)))
  263.  
  264.  
  265. class C3k2_LDConv1(C2f):
  266.     """Faster Implementation of CSP Bottleneck with 2 convolutions."""
  267.  
  268.     def __init__(self, c1, c2, n=1, c3k=False, e=0.5, g=1, shortcut=True):
  269.         """Initializes the C3k2 module, a faster CSP Bottleneck with 2 convolutions and optional C3k blocks."""
  270.         super().__init__(c1, c2, n, shortcut, g, e)
  271.         self.m = nn.ModuleList(
  272.             C3k(self.c, self.c, 2, shortcut, g) if c3k else Bottleneck_LDConv(self.c, self.c, shortcut, g) for _ in range(n)
  273.         )
  274.  
  275. class C3k2_LDConv2(C2f):
  276.     """Faster Implementation of CSP Bottleneck with 2 convolutions."""
  277.  
  278.     def __init__(self, c1, c2, n=1, c3k=False, e=0.5, g=1, shortcut=True):
  279.         """Initializes the C3k2 module, a faster CSP Bottleneck with 2 convolutions and optional C3k blocks."""
  280.         super().__init__(c1, c2, n, shortcut, g, e)
  281.         self.m = nn.ModuleList(
  282.             C3kLDConv(self.c, self.c, 2, shortcut, g) if c3k else Bottleneck(self.c, self.c, shortcut, g) for _ in range(n)
  283.         )
  284.  
  285.  
  286.  
  287. if __name__ == "__main__":
  288.     # Generating Sample image
  289.     image_size = (1, 64, 224, 224)
  290.     image = torch.rand(*image_size)
  291.  
  292.     # Model
  293.     model = C3k2_LDConv2(64, 64)
  294.  
  295.     out = model(image)
  296.     print(out.size())

四、添加方法

4.1 修改一

第一还是建立文件，我们找到如下 ultralytics /nn文件夹下建立一个目录名字呢就是'Addmodules'文件夹 ！然后在其内部建立一个新的py文件将核心代码复制粘贴进去即可。

​

4.2 修改二

第二步我们在该目录下创建一个新的py文件名字为'__init__.py' ，然后在其内部导入我们的检测头如下图所示。

​

4.3 修改三

第三步找到如下文件'ultralytics/nn/tasks.py'进行导入和注册我们的模块( ！

​

4.4 修改四

找到文件到如下文件'ultralytics/nn/tasks.py'，在其中的parse_model方法中添加即可。

​

到此就修改完成了，大家可以复制下面的yaml文件运行。

五、正式训练

5.1 yaml文件1

训练信息：YOLO11-LDConv summary: 337 layers, 2,427,141 parameters, 2,427,125 gradients, 6.2 GFLOPs 

  1. # Ultralytics YOLO 🚀, AGPL-3.0 license
  2. # YOLO11 object detection model with P3-P5 outputs. For Usage examples see https://docs.ultralytics.com/tasks/detect
  3.  
  4. # Parameters
  5. nc: 80 # number of classes
  6. scales: # model compound scaling constants, i.e. 'model=yolo11n.yaml' will call yolo11.yaml with scale 'n'
  7.   # [depth, width, max_channels]
  8.   n: [0.50, 0.25, 1024] # summary: 319 layers, 2624080 parameters, 2624064 gradients, 6.6 GFLOPs
  9.   s: [0.50, 0.50, 1024] # summary: 319 layers, 9458752 parameters, 9458736 gradients, 21.7 GFLOPs
  10.   m: [0.50, 1.00, 512] # summary: 409 layers, 20114688 parameters, 20114672 gradients, 68.5 GFLOPs
  11.   l: [1.00, 1.00, 512] # summary: 631 layers, 25372160 parameters, 25372144 gradients, 87.6 GFLOPs
  12.   x: [1.00, 1.50, 512] # summary: 631 layers, 56966176 parameters, 56966160 gradients, 196.0 GFLOPs
  13.  
  14. # YOLO11n backbone
  15. backbone:
  16.   # [from, repeats, module, args]
  17.   - [-1, 1, Conv, [64, 3, 2]] # 0-P1/2
  18.   - [-1, 1, LDConv, [128, 6, 2]] # 1-P2/4
  19.   - [-1, 2, C3k2, [256, False, 0.25]]
  20.   - [-1, 1, LDConv, [256, 6, 2]] # 3-P3/8
  21.   - [-1, 2, C3k2, [512, False, 0.25]]
  22.   - [-1, 1, LDConv, [512, 6, 2]] # 5-P4/16
  23.   - [-1, 2, C3k2, [512, True]]
  24.   - [-1, 1, LDConv, [1024, 6, 2]] # 7-P5/32
  25.   - [-1, 2, C3k2, [1024, True]]
  26.   - [-1, 1, SPPF, [1024, 5]] # 9
  27.   - [-1, 2, C2PSA, [1024]] # 10
  28.  
  29. # YOLO11n head
  30. head:
  31.   - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  32.   - [[-1, 6], 1, Concat, [1]] # cat backbone P4
  33.   - [-1, 2, C3k2, [512, False]] # 13
  34.  
  35.   - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  36.   - [[-1, 4], 1, Concat, [1]] # cat backbone P3
  37.   - [-1, 2, C3k2, [256, False]] # 16 (P3/8-small)
  38.  
  39.   - [-1, 1, LDConv, [256, 6, 2]]
  40.   - [[-1, 13], 1, Concat, [1]] # cat head P4
  41.   - [-1, 2, C3k2, [512, False]] # 19 (P4/16-medium)
  42.  
  43.   - [-1, 1, LDConv, [512, 6, 2]]
  44.   - [[-1, 10], 1, Concat, [1]] # cat head P5
  45.   - [-1, 2, C3k2, [1024, True]] # 22 (P5/32-large)
  46.  
  47.   - [[16, 19, 22], 1, Detect, [nc]] # Detect(P3, P4, P5)

5.2 yaml文件2

训练信息：YOLO11-C3k2-LDConv-1 summary: 335 layers, 2,566,923 parameters, 2,566,907 gradients, 6.3 GFLOPs 

  1. # Ultralytics YOLO 🚀, AGPL-3.0 license
  2. # YOLO11 object detection model with P3-P5 outputs. For Usage examples see https://docs.ultralytics.com/tasks/detect
  3.  
  4. # Parameters
  5. nc: 80 # number of classes
  6. scales: # model compound scaling constants, i.e. 'model=yolo11n.yaml' will call yolo11.yaml with scale 'n'
  7.   # [depth, width, max_channels]
  8.   n: [0.50, 0.25, 1024] # summary: 319 layers, 2624080 parameters, 2624064 gradients, 6.6 GFLOPs
  9.   s: [0.50, 0.50, 1024] # summary: 319 layers, 9458752 parameters, 9458736 gradients, 21.7 GFLOPs
  10.   m: [0.50, 1.00, 512] # summary: 409 layers, 20114688 parameters, 20114672 gradients, 68.5 GFLOPs
  11.   l: [1.00, 1.00, 512] # summary: 631 layers, 25372160 parameters, 25372144 gradients, 87.6 GFLOPs
  12.   x: [1.00, 1.50, 512] # summary: 631 layers, 56966176 parameters, 56966160 gradients, 196.0 GFLOPs
  13.  
  14. # YOLO11n backbone
  15. backbone:
  16.   # [from, repeats, module, args]
  17.   - [-1, 1, Conv, [64, 3, 2]] # 0-P1/2
  18.   - [-1, 1, Conv, [128, 3, 2]] # 1-P2/4
  19.   - [-1, 2, C3k2_LDConv1, [256, False, 0.25]]
  20.   - [-1, 1, Conv, [256, 3, 2]] # 3-P3/8
  21.   - [-1, 2, C3k2_LDConv1, [512, False, 0.25]]
  22.   - [-1, 1, Conv, [512, 3, 2]] # 5-P4/16
  23.   - [-1, 2, C3k2_LDConv1, [512, True]]
  24.   - [-1, 1, Conv, [1024, 3, 2]] # 7-P5/32
  25.   - [-1, 2, C3k2_LDConv1, [1024, True]]
  26.   - [-1, 1, SPPF, [1024, 5]] # 9
  27.   - [-1, 2, C2PSA, [1024]] # 10
  28.  
  29. # YOLO11n head
  30. head:
  31.   - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  32.   - [[-1, 6], 1, Concat, [1]] # cat backbone P4
  33.   - [-1, 2, C3k2_LDConv1, [512, False]] # 13
  34.  
  35.   - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  36.   - [[-1, 4], 1, Concat, [1]] # cat backbone P3
  37.   - [-1, 2, C3k2_LDConv1, [256, False]] # 16 (P3/8-small)
  38.  
  39.   - [-1, 1, Conv, [256, 3, 2]]
  40.   - [[-1, 13], 1, Concat, [1]] # cat head P4
  41.   - [-1, 2, C3k2_LDConv1, [512, False]] # 19 (P4/16-medium)
  42.  
  43.   - [-1, 1, Conv, [512, 3, 2]]
  44.   - [[-1, 10], 1, Concat, [1]] # cat head P5
  45.   - [-1, 2, C3k2_LDConv1, [1024, True]] # 22 (P5/32-large)
  46.  
  47.   - [[16, 19, 22], 1, Detect, [nc]] # Detect(P3, P4, P5)

5.3 yaml文件3

训练信息：YOLO11-C3k2-LDConv-2 summary: 338 layers, 2,499,489 parameters, 2,499,473 gradients, 6.4 GFLOPs 

  1. # Ultralytics YOLO 🚀, AGPL-3.0 license
  2. # YOLO11 object detection model with P3-P5 outputs. For Usage examples see https://docs.ultralytics.com/tasks/detect
  3.  
  4. # Parameters
  5. nc: 80 # number of classes
  6. scales: # model compound scaling constants, i.e. 'model=yolo11n.yaml' will call yolo11.yaml with scale 'n'
  7.   # [depth, width, max_channels]
  8.   n: [0.50, 0.25, 1024] # summary: 319 layers, 2624080 parameters, 2624064 gradients, 6.6 GFLOPs
  9.   s: [0.50, 0.50, 1024] # summary: 319 layers, 9458752 parameters, 9458736 gradients, 21.7 GFLOPs
  10.   m: [0.50, 1.00, 512] # summary: 409 layers, 20114688 parameters, 20114672 gradients, 68.5 GFLOPs
  11.   l: [1.00, 1.00, 512] # summary: 631 layers, 25372160 parameters, 25372144 gradients, 87.6 GFLOPs
  12.   x: [1.00, 1.50, 512] # summary: 631 layers, 56966176 parameters, 56966160 gradients, 196.0 GFLOPs
  13.  
  14. # YOLO11n backbone
  15. backbone:
  16.   # [from, repeats, module, args]
  17.   - [-1, 1, Conv, [64, 3, 2]] # 0-P1/2
  18.   - [-1, 1, Conv, [128, 3, 2]] # 1-P2/4
  19.   - [-1, 2, C3k2_LDConv2, [256, False, 0.25]]
  20.   - [-1, 1, Conv, [256, 3, 2]] # 3-P3/8
  21.   - [-1, 2, C3k2_LDConv2, [512, False, 0.25]]
  22.   - [-1, 1, Conv, [512, 3, 2]] # 5-P4/16
  23.   - [-1, 2, C3k2_LDConv2, [512, True]]
  24.   - [-1, 1, Conv, [1024, 3, 2]] # 7-P5/32
  25.   - [-1, 2, C3k2_LDConv2, [1024, True]]
  26.   - [-1, 1, SPPF, [1024, 5]] # 9
  27.   - [-1, 2, C2PSA, [1024]] # 10
  28.  
  29. # YOLO11n head
  30. head:
  31.   - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  32.   - [[-1, 6], 1, Concat, [1]] # cat backbone P4
  33.   - [-1, 2, C3k2_LDConv2, [512, False]] # 13
  34.  
  35.   - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  36.   - [[-1, 4], 1, Concat, [1]] # cat backbone P3
  37.   - [-1, 2, C3k2_LDConv2, [256, False]] # 16 (P3/8-small)
  38.  
  39.   - [-1, 1, Conv, [256, 3, 2]]
  40.   - [[-1, 13], 1, Concat, [1]] # cat head P4
  41.   - [-1, 2, C3k2_LDConv2, [512, False]] # 19 (P4/16-medium)
  42.  
  43.   - [-1, 1, Conv, [512, 3, 2]]
  44.   - [[-1, 10], 1, Concat, [1]] # cat head P5
  45.   - [-1, 2, C3k2_LDConv2, [1024, True]] # 22 (P5/32-large)
  46.  
  47.   - [[16, 19, 22], 1, Detect, [nc]] # Detect(P3, P4, P5)

5.4 训练代码

大家可以创建一个py文件将我给的代码复制粘贴进去，配置好自己的文件路径即可运行。 

  1. import warnings
  2. warnings.filterwarnings('ignore')
  3. from ultralytics import YOLO
  4.  
  5. if __name__ == '__main__':
  6.     model = YOLO('yolov8-MLLA.yaml')
  7.     # 如何切换模型版本, 上面的ymal文件可以改为 yolov8s.yaml就是使用的v8s,
  8.     # 类似某个改进的yaml文件名称为yolov8-XXX.yaml那么如果想使用其它版本就把上面的名称改为yolov8l-XXX.yaml即可（改的是上面YOLO中间的名字不是配置文件的）！
  9.     # model.load('yolov8n.pt') # 是否加载预训练权重,科研不建议大家加载否则很难提升精度
  10.     model.train(data=r"C:\Users\Administrator\PycharmProjects\yolov5-master\yolov5-master\Construction Site Safety.v30-raw-images_latestversion.yolov8\data.yaml",
  11.                 # 如果大家任务是其它的'ultralytics/cfg/default.yaml'找到这里修改task可以改成detect, segment, classify, pose
  12.                 cache=False,
  13.                 imgsz=640,
  14.                 epochs=150,
  15.                 single_cls=False,  # 是否是单类别检测
  16.                 batch=16,
  17.                 close_mosaic=0,
  18.                 workers=0,
  19.                 device='0',
  20.                 optimizer='SGD', # using SGD
  21.                 # resume='runs/train/exp21/weights/last.pt', # 如过想续训就设置last.pt的地址
  22.                 amp=False,  # 如果出现训练损失为Nan可以关闭amp
  23.                 project='runs/train',
  24.                 name='exp',
  25.                 )

5.5 训练过程截图

五、本文总结

到此本文的正式分享内容就结束了，在这里给大家推荐我的YOLOv11改进有效涨点专栏，本专栏目前为新开的平均质量分98分，后期我会根据各种最新的前沿顶会进行论文复现，也会对一些老的改进机制进行补充，如果大家觉得本文帮助到你了，订阅本专栏，关注后续更多的更新~