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【YOLO学习】YOLOv8改进举例

article 2024/11/7 21:29:14

文章目录

  • 1. ODConv
    • 1.1 修改
    • 1.2 原yaml文件
    • 1.3 修改yaml文件样式1
    • 1.4 修改yaml文件样式2
  • 2. DAT
  • 3. 在train下修改模型

1. ODConv

1.1 修改

 1. 在ultralytics/nn/models里创建ODConv.py文件。

 2. 在ultralytics/nn/task.py中导入from .modules.ODConv import C2f_ODConv,ODConv2d

在这里插入图片描述

1.2 原yaml文件

 在ultralytics/cfg/models/v8/yolov8.yaml里。

# Ultralytics YOLO 🚀, AGPL-3.0 license
# YOLOv8 object detection model with P3-P5 outputs. For Usage examples see https://docs.ultralytics.com/tasks/detect

# Parameters
nc: 80 # number of classes
scales: # model compound scaling constants, i.e. 'model=yolov8n.yaml' will call yolov8.yaml with scale 'n'
  # [depth, width, max_channels]
  n: [0.33, 0.25, 1024] # YOLOv8n summary: 225 layers,  3157200 parameters,  3157184 gradients,   8.9 GFLOPs
  s: [0.33, 0.50, 1024] # YOLOv8s summary: 225 layers, 11166560 parameters, 11166544 gradients,  28.8 GFLOPs
  m: [0.67, 0.75, 768] # YOLOv8m summary: 295 layers, 25902640 parameters, 25902624 gradients,  79.3 GFLOPs
  l: [1.00, 1.00, 512] # YOLOv8l summary: 365 layers, 43691520 parameters, 43691504 gradients, 165.7 GFLOPs
  x: [1.00, 1.25, 512] # YOLOv8x summary: 365 layers, 68229648 parameters, 68229632 gradients, 258.5 GFLOPs

# YOLOv8.0n backbone
backbone:
  # [from, repeats, module, args]
  - [-1, 1, Conv, [64, 3, 2]] # 0-P1/2
  - [-1, 1, Conv, [128, 3, 2]] # 1-P2/4
  - [-1, 3, C2f, [128, True]]
  - [-1, 1, Conv, [256, 3, 2]] # 3-P3/8
  - [-1, 6, C2f, [256, True]]
  - [-1, 1, Conv, [512, 3, 2]] # 5-P4/16
  - [-1, 6, C2f, [512, True]]
  - [-1, 1, Conv, [1024, 3, 2]] # 7-P5/32
  - [-1, 3, C2f, [1024, True]]
  - [-1, 1, SPPF, [1024, 5]] # 9

# YOLOv8.0n head
head:
  - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  - [[-1, 6], 1, Concat, [1]] # cat backbone P4
  - [-1, 3, C2f, [512]] # 12

  - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  - [[-1, 4], 1, Concat, [1]] # cat backbone P3
  - [-1, 3, C2f, [256]] # 15 (P3/8-small)

  - [-1, 1, Conv, [256, 3, 2]]
  - [[-1, 12], 1, Concat, [1]] # cat head P4
  - [-1, 3, C2f, [512]] # 18 (P4/16-medium)

  - [-1, 1, Conv, [512, 3, 2]]
  - [[-1, 9], 1, Concat, [1]] # cat head P5
  - [-1, 3, C2f, [1024]] # 21 (P5/32-large)

  - [[15, 18, 21], 1, Detect, [nc]] # Detect(P3, P4, P5)

1.3 修改yaml文件样式1

# Ultralytics YOLO 🚀, AGPL-3.0 license
# YOLOv8 object detection model with P3-P5 outputs. For Usage examples see https://docs.ultralytics.com/tasks/detect
 
# Parameters
nc: 80  # number of classes
scales: # model compound scaling constants, i.e. 'model=yolov8n.yaml' will call yolov8.yaml with scale 'n'
  # [depth, width, max_channels]
  n: [0.33, 0.25, 1024]  # YOLOv8n summary: 225 layers,  3157200 parameters,  3157184 gradients,   8.9 GFLOPs
  s: [0.33, 0.50, 1024]  # YOLOv8s summary: 225 layers, 11166560 parameters, 11166544 gradients,  28.8 GFLOPs
  m: [0.67, 0.75, 768]   # YOLOv8m summary: 295 layers, 25902640 parameters, 25902624 gradients,  79.3 GFLOPs
  l: [1.00, 1.00, 512]   # YOLOv8l summary: 365 layers, 43691520 parameters, 43691504 gradients, 165.7 GFLOPs
  x: [1.00, 1.25, 512]   # YOLOv8x summary: 365 layers, 68229648 parameters, 68229632 gradients, 258.5 GFLOP
 
# YOLOv8.0 backbone
backbone:
  # [from, repeats, module, args]
  - [-1, 1, Conv, [64, 3, 2]]  # 0-P1/2
  - [-1, 1, Conv, [128, 3, 2]]  # 1-P2/4
  - [-1, 3, C2f, [128, True]]
  - [-1, 1, Conv, [256, 3, 2]]  # 3-P3/8
  - [-1, 6, C2f, [256, True]]
  - [-1, 1, Conv, [512, 3, 2]]  # 5-P4/16
  - [-1, 6, C2f, [512, True]]
  - [-1, 1, Conv, [1024, 3, 2]]  # 7-P5/32
  - [-1, 3, C2f, [1024, True]]
  - [-1, 1, SPPF, [1024, 5]]  # 9
 
# YOLOv8.0n head
head:
  - [-1, 1, nn.Upsample, [None, 2, 'nearest']]
  - [[-1, 6], 1, Concat, [1]]  # cat backbone P4
  - [-1, 3, C2f, [512]]  # 12
 
  - [-1, 1, nn.Upsample, [None, 2, 'nearest']]
  - [[-1, 4], 1, Concat, [1]]  # cat backbone P3
  - [-1, 3, C2f_ODConv, [256]]  # 15 (P3/8-small)
 
  - [-1, 1, Conv, [256, 3, 2]]
  - [[-1, 12], 1, Concat, [1]]  # cat head P4
  - [-1, 3, C2f_ODConv, [512]]  # 18 (P4/16-medium)
 
  - [-1, 1, Conv, [512, 3, 2]]
  - [[-1, 9], 1, Concat, [1]]  # cat head P5
  - [-1, 3, C2f_ODConv, [1024]]  # 21 (P5/32-large)
 
  - [[15, 18, 21], 1, Detect, [nc]]  # Detect(P3, P4, P5)

1.4 修改yaml文件样式2

# Ultralytics YOLO 🚀, AGPL-3.0 license
# YOLOv8 object detection model with P3-P5 outputs. For Usage examples see https://docs.ultralytics.com/tasks/detect
 
# Parameters
nc: 80  # number of classes
scales: # model compound scaling constants, i.e. 'model=yolov8n.yaml' will call yolov8.yaml with scale 'n'
  # [depth, width, max_channels]
  n: [0.33, 0.25, 1024]  # YOLOv8n summary: 225 layers,  3157200 parameters,  3157184 gradients,   8.9 GFLOPs
  s: [0.33, 0.50, 1024]  # YOLOv8s summary: 225 layers, 11166560 parameters, 11166544 gradients,  28.8 GFLOPs
  m: [0.67, 0.75, 768]   # YOLOv8m summary: 295 layers, 25902640 parameters, 25902624 gradients,  79.3 GFLOPs
  l: [1.00, 1.00, 512]   # YOLOv8l summary: 365 layers, 43691520 parameters, 43691504 gradients, 165.7 GFLOPs
  x: [1.00, 1.25, 512]   # YOLOv8x summary: 365 layers, 68229648 parameters, 68229632 gradients, 258.5 GFLOP
 
# YOLOv8.0 backbone
backbone:
  # [from, repeats, module, args]
  - [-1, 1, Conv, [64, 3, 2]]  # 0-P1/2
  - [-1, 1, ODConv2d, [128, 3, 2]]  # 1-P2/4
  - [-1, 3, C2f, [128, True]]
  - [-1, 1, ODConv2d, [256, 3, 2]]  # 3-P3/8
  - [-1, 6, C2f, [256, True]]
  - [-1, 1, ODConv2d, [512, 3, 2]]  # 5-P4/16
  - [-1, 6, C2f, [512, True]]
  - [-1, 1, ODConv2d, [1024, 3, 2]]  # 7-P5/32
  - [-1, 3, C2f, [1024, True]]
  - [-1, 1, SPPF, [1024, 5]]  # 9
 
# YOLOv8.0n head
head:
  - [-1, 1, nn.Upsample, [None, 2, 'nearest']]
  - [[-1, 6], 1, Concat, [1]]  # cat backbone P4
  - [-1, 3, C2f, [512]]  # 12
 
  - [-1, 1, nn.Upsample, [None, 2, 'nearest']]
  - [[-1, 4], 1, Concat, [1]]  # cat backbone P3
  - [-1, 3, C2f, [256]]  # 15 (P3/8-small)
 
  - [-1, 1, ODConv2d, [256, 3, 2]]
  - [[-1, 12], 1, Concat, [1]]  # cat head P4
  - [-1, 3, C2f, [512]]  # 18 (P4/16-medium)
 
  - [-1, 1, ODConv2d, [512, 3, 2]]
  - [[-1, 9], 1, Concat, [1]]  # cat head P5
  - [-1, 3, C2f, [1024]]  # 21 (P5/32-large)
 
  - [[15, 18, 21], 1, Detect, [nc]]  # Detect(P3, P4, P5)

2. DAT

import numpy as np
import torch
import torch.nn as nn
import torch.nn.functional as F
import einops
from timm.models.layers import to_2tuple, trunc_normal_
 
class LayerNormProxy(nn.Module):
 
    def __init__(self, dim):
        super().__init__()
        self.norm = nn.LayerNorm(dim)
 
    def forward(self, x):
        x = einops.rearrange(x, 'b c h w -> b h w c')
        x = self.norm(x)
        return einops.rearrange(x, 'b h w c -> b c h w')
 
 
class DAttentionBaseline(nn.Module):
 
    def __init__(
            self, q_size=(224,224), kv_size=(224,224), n_heads=8, n_head_channels=32, n_groups=1,
            attn_drop=0.0, proj_drop=0.0, stride=1,
            offset_range_factor=-1, use_pe=True, dwc_pe=True,
            no_off=False, fixed_pe=False, ksize=9, log_cpb=False
    ):
 
        super().__init__()
        n_head_channels = int(q_size / 8)
        q_size = (q_size, q_size)
 
        self.dwc_pe = dwc_pe
        self.n_head_channels = n_head_channels
        self.scale = self.n_head_channels ** -0.5
        self.n_heads = n_heads
        self.q_h, self.q_w = q_size
        # self.kv_h, self.kv_w = kv_size
        self.kv_h, self.kv_w = self.q_h // stride, self.q_w // stride
        self.nc = n_head_channels * n_heads
        self.n_groups = n_groups
        self.n_group_channels = self.nc // self.n_groups
        self.n_group_heads = self.n_heads // self.n_groups
        self.use_pe = use_pe
        self.fixed_pe = fixed_pe
        self.no_off = no_off
        self.offset_range_factor = offset_range_factor
        self.ksize = ksize
        self.log_cpb = log_cpb
        self.stride = stride
        kk = self.ksize
        pad_size = kk // 2 if kk != stride else 0
 
 
        self.conv_offset = nn.Sequential(
            nn.Conv2d(self.n_group_channels, self.n_group_channels, kk, stride, pad_size, groups=self.n_group_channels),
            LayerNormProxy(self.n_group_channels),
            nn.GELU(),
            nn.Conv2d(self.n_group_channels, 2, 1, 1, 0, bias=False)
        )
 
        if self.no_off:
            for m in self.conv_offset.parameters():
                m.requires_grad_(False)
 
        self.proj_q = nn.Conv2d(
            self.nc, self.nc,
            kernel_size=1, stride=1, padding=0
        )
 
        self.proj_k = nn.Conv2d(
            self.nc, self.nc,
            kernel_size=1, stride=1, padding=0)
 
        self.proj_v = nn.Conv2d(
            self.nc, self.nc,
            kernel_size=1, stride=1, padding=0
        )
        self.proj_out = nn.Conv2d(
            self.nc, self.nc,
            kernel_size=1, stride=1, padding=0
        )
 
        self.proj_drop = nn.Dropout(proj_drop, inplace=True)
        self.attn_drop = nn.Dropout(attn_drop, inplace=True)
 
        if self.use_pe and not self.no_off:
            if self.dwc_pe:
                self.rpe_table = nn.Conv2d(
                    self.nc, self.nc, kernel_size=3, stride=1, padding=1, groups=self.nc)
            elif self.fixed_pe:
                self.rpe_table = nn.Parameter(
                    torch.zeros(self.n_heads, self.q_h * self.q_w, self.kv_h * self.kv_w)
                )
                trunc_normal_(self.rpe_table, std=0.01)
            elif self.log_cpb:
                # Borrowed from Swin-V2
                self.rpe_table = nn.Sequential(
                    nn.Linear(2, 32, bias=True),
                    nn.ReLU(inplace=True),
                    nn.Linear(32, self.n_group_heads, bias=False)
                )
            else:
                self.rpe_table = nn.Parameter(
                    torch.zeros(self.n_heads, self.q_h * 2 - 1, self.q_w * 2 - 1)
                )
                trunc_normal_(self.rpe_table, std=0.01)
        else:
            self.rpe_table = None
 
    @torch.no_grad()
    def _get_ref_points(self, H_key, W_key, B, dtype, device):
 
        ref_y, ref_x = torch.meshgrid(
            torch.linspace(0.5, H_key - 0.5, H_key, dtype=dtype, device=device),
            torch.linspace(0.5, W_key - 0.5, W_key, dtype=dtype, device=device),
            indexing='ij'
        )
        ref = torch.stack((ref_y, ref_x), -1)
        ref[..., 1].div_(W_key - 1.0).mul_(2.0).sub_(1.0)
        ref[..., 0].div_(H_key - 1.0).mul_(2.0).sub_(1.0)
        ref = ref[None, ...].expand(B * self.n_groups, -1, -1, -1)  # B * g H W 2
 
        return ref
 
    @torch.no_grad()
    def _get_q_grid(self, H, W, B, dtype, device):
 
        ref_y, ref_x = torch.meshgrid(
            torch.arange(0, H, dtype=dtype, device=device),
            torch.arange(0, W, dtype=dtype, device=device),
            indexing='ij'
        )
        ref = torch.stack((ref_y, ref_x), -1)
        ref[..., 1].div_(W - 1.0).mul_(2.0).sub_(1.0)
        ref[..., 0].div_(H - 1.0).mul_(2.0).sub_(1.0)
        ref = ref[None, ...].expand(B * self.n_groups, -1, -1, -1)  # B * g H W 2
 
        return ref
 
    def forward(self, x):
        x = x
        B, C, H, W = x.size()
        dtype, device = x.dtype, x.device
 
        q = self.proj_q(x)
        q_off = einops.rearrange(q, 'b (g c) h w -> (b g) c h w', g=self.n_groups, c=self.n_group_channels)
        offset = self.conv_offset(q_off).contiguous()  # B * g 2 Hg Wg
        Hk, Wk = offset.size(2), offset.size(3)
        n_sample = Hk * Wk
 
        if self.offset_range_factor >= 0 and not self.no_off:
            offset_range = torch.tensor([1.0 / (Hk - 1.0), 1.0 / (Wk - 1.0)], device=device).reshape(1, 2, 1, 1)
            offset = offset.tanh().mul(offset_range).mul(self.offset_range_factor)
 
        offset = einops.rearrange(offset, 'b p h w -> b h w p')
        reference = self._get_ref_points(Hk, Wk, B, dtype, device)
 
        if self.no_off:
            offset = offset.fill_(0.0)
 
        if self.offset_range_factor >= 0:
            pos = offset + reference
        else:
            pos = (offset + reference).clamp(-1., +1.)
 
        if self.no_off:
            x_sampled = F.avg_pool2d(x, kernel_size=self.stride, stride=self.stride)
            assert x_sampled.size(2) == Hk and x_sampled.size(3) == Wk, f"Size is {x_sampled.size()}"
        else:
            x_sampled = F.grid_sample(
                input=x.reshape(B * self.n_groups, self.n_group_channels, H, W),
                grid=pos[..., (1, 0)],  # y, x -> x, y
                mode='bilinear', align_corners=True)  # B * g, Cg, Hg, Wg
 
        x_sampled = x_sampled.reshape(B, C, 1, n_sample)
        # self.proj_k.weight = torch.nn.Parameter(self.proj_k.weight.float())
        # self.proj_k.bias = torch.nn.Parameter(self.proj_k.bias.float())
        # self.proj_v.weight = torch.nn.Parameter(self.proj_v.weight.float())
        # self.proj_v.bias = torch.nn.Parameter(self.proj_v.bias.float())
        # 检查权重的数据类型
        q = q.reshape(B * self.n_heads, self.n_head_channels, H * W)
 
        k = self.proj_k(x_sampled).reshape(B * self.n_heads, self.n_head_channels, n_sample)
        v = self.proj_v(x_sampled).reshape(B * self.n_heads, self.n_head_channels, n_sample)
 
        attn = torch.einsum('b c m, b c n -> b m n', q, k)  # B * h, HW, Ns
        attn = attn.mul(self.scale)
 
        if self.use_pe and (not self.no_off):
 
            if self.dwc_pe:
                residual_lepe = self.rpe_table(q.reshape(B, C, H, W)).reshape(B * self.n_heads, self.n_head_channels,
                                                                              H * W)
            elif self.fixed_pe:
                rpe_table = self.rpe_table
                attn_bias = rpe_table[None, ...].expand(B, -1, -1, -1)
                attn = attn + attn_bias.reshape(B * self.n_heads, H * W, n_sample)
            elif self.log_cpb:
                q_grid = self._get_q_grid(H, W, B, dtype, device)
                displacement = (
                            q_grid.reshape(B * self.n_groups, H * W, 2).unsqueeze(2) - pos.reshape(B * self.n_groups,
                                                                                                   n_sample,
                                                                                                   2).unsqueeze(1)).mul(
                    4.0)  # d_y, d_x [-8, +8]
                displacement = torch.sign(displacement) * torch.log2(torch.abs(displacement) + 1.0) / np.log2(8.0)
                attn_bias = self.rpe_table(displacement)  # B * g, H * W, n_sample, h_g
                attn = attn + einops.rearrange(attn_bias, 'b m n h -> (b h) m n', h=self.n_group_heads)
            else:
                rpe_table = self.rpe_table
                rpe_bias = rpe_table[None, ...].expand(B, -1, -1, -1)
                q_grid = self._get_q_grid(H, W, B, dtype, device)
                displacement = (
                            q_grid.reshape(B * self.n_groups, H * W, 2).unsqueeze(2) - pos.reshape(B * self.n_groups,
                                                                                                   n_sample,
                                                                                                   2).unsqueeze(1)).mul(
                    0.5)
                attn_bias = F.grid_sample(
                    input=einops.rearrange(rpe_bias, 'b (g c) h w -> (b g) c h w', c=self.n_group_heads,
                                           g=self.n_groups),
                    grid=displacement[..., (1, 0)],
                    mode='bilinear', align_corners=True)  # B * g, h_g, HW, Ns
 
                attn_bias = attn_bias.reshape(B * self.n_heads, H * W, n_sample)
                attn = attn + attn_bias
 
        attn = F.softmax(attn, dim=2)
        attn = self.attn_drop(attn)
 
        out = torch.einsum('b m n, b c n -> b c m', attn, v)
 
        if self.use_pe and self.dwc_pe:
            out = out + residual_lepe
        out = out.reshape(B, C, H, W)
 
        y = self.proj_drop(self.proj_out(out))
        h, w = pos.reshape(B, self.n_groups, Hk, Wk, 2), reference.reshape(B, self.n_groups, Hk, Wk, 2)
 
        return y

3. 在train下修改模型

 需要在训练的文件里把 model 那里改为对应的 yaml 文件。


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