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内容来源：中小站长动力网所属栏目：热点更新日期：2024-11-29

tood

Tood toodd𐟓ž..-Peii-的微博视频

yolov8改进 1️⃣ 模型设计：YOLOv8引入了全新的SOTA模型，包括目标检测网络和基于YOLACT的实例分割模型。与YOLOv5相似，提供了不同尺度（N/S/M/L/X）的模型，以适应不同场景需求。 2️⃣ Backbone和Neck：调整第一个卷积层的kernel从6x6到3x3，优化初始特征提取。在所有C3模块中引入C2f结构，新增跳层连接和额外的Split操作，提升梯度流的丰富性。删除Neck模块中的两个卷积连接层，简化结构。调整Backbone中C2f的block数量，从3-6-9-3变为3-6-6-3，优化网络深度。对于不同大小的模型（N/S/M/L/X），观察到N/S和L/X两组模型只调整了缩放系数，而S/M/L等骨干网络的通道数设置并没有遵循同一套缩放系数。 3️⃣ Head：YOLOv8的Head经历了两大改进：从耦合头结构变为解耦头结构；从Anchor-Based结构转变为Anchor-Free，增强了模型对目标的检测能力。 4️⃣ Loss计算：Loss计算包括正负样本分配策略和Loss计算。引入TOOD的TaskAlignedAssigner，这是一种动态分配策略。TaskAlignedAssigner的匹配策略基于分类和回归的分数加权，简化了样本的选择过程。 Loss计算分为两个分支：分类分支采用BCE Loss，回归分支使用Distribution Focal Loss，结合CIoU Loss和积分形式表示法，以提高模型对边界框的回归准确性。这三个Loss按一定的权重比例进行加权。 5️⃣ 训练：在训练方面，YOLOv8引入了YOLOX中的思想，在最后10个epoch关闭了Mosaic增强操作，这一调整有效提升了精度。

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