Yolov5更换激活函数

yolov5中utils/activations.py文件中已经写好了好多种激活函数，直接调用即可

如果要调用需要去common.py文件里修改，改完记得导入一下

想更换其他激活函数可以参照下面代码

class Conv(nn.Module):
    # Standard convolution
    def __init__(self, c1, c2, k=1, s=1, p=None, g=1, act=True):  # ch_in, ch_out, kernel, stride, padding, groups
        super().__init__()
        self.conv = nn.Conv2d(c1, c2, k, s, autopad(k, p), groups=g, bias=False)
        self.bn = nn.BatchNorm2d(c2)
        #self.act = nn.SiLU() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = nn.Identity() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = nn.Tanh() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = nn.Sigmoid() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = nn.ReLU() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = nn.LeakyReLU(0.1) if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = nn.Hardswish() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = nn.SiLU() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = Mish() if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = FReLU(c2) if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = AconC(c2) if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        self.act = MetaAconC(c2) if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = SiLU_beta(c2) if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        #self.act = FReLU_noBN_biasFalse(c2) if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
        # self.act = FReLU_noBN_biasTrue(c2) if act is True else (act if isinstance(act, nn.Module) else nn.Identity())
    def forward(self, x):
        return self.act(self.bn(self.conv(x)))

    def forward_fuse(self, x):
        return self.act(self.conv(x))

上面只改了class Conv(nn.Module)里的 nn.SiLU()，BotteleneckCSP的 nn.SiLU()也可以改进，我试了一下都是可以跑通的，具体效果如何还不清楚~~~

reference：

Yolov5如何更换激活函数？_迪菲赫尔曼的博客-CSDN博客_yolov5激活函数