Reference for ultralytics/nn/modules/conv.py

def forward(self, x):
    """Apply convolution, batch normalization and activation to input tensor."""
    return self.act(self.bn(self.conv(x)))

def forward_fuse(self, x):
    """Perform transposed convolution of 2D data."""
    return self.act(self.conv(x))

def forward(self, x):
    """Apply convolution, batch normalization and activation to input tensor."""
    return self.act(self.bn(self.conv(x) + self.cv2(x)))

def forward_fuse(self, x):
    """Apply fused convolution, batch normalization and activation to input tensor."""
    return self.act(self.bn(self.conv(x)))

def fuse_convs(self):
    """Fuse parallel convolutions."""
    w = torch.zeros_like(self.conv.weight.data)
    i = [x // 2 for x in w.shape[2:]]
    w[:, :, i[0] : i[0] + 1, i[1] : i[1] + 1] = self.cv2.weight.data.clone()
    self.conv.weight.data += w
    self.__delattr__("cv2")
    self.forward = self.forward_fuse

def forward(self, x):
    """Apply 2 convolutions to input tensor."""
    return self.conv2(self.conv1(x))

def forward(self, x):
    """Applies transposed convolutions, batch normalization and activation to input."""
    return self.act(self.bn(self.conv_transpose(x)))

def forward_fuse(self, x):
    """Applies activation and convolution transpose operation to input."""
    return self.act(self.conv_transpose(x))

def forward(self, x):
    """
    Applies convolution to concatenated tensor and returns the output.

    Input shape is (b,c,w,h) and output shape is (b,4c,w/2,h/2).
    """
    return self.conv(torch.cat((x[..., ::2, ::2], x[..., 1::2, ::2], x[..., ::2, 1::2], x[..., 1::2, 1::2]), 1))

def forward(self, x):
    """Forward propagation through a Ghost Bottleneck layer with skip connection."""
    y = self.cv1(x)
    return torch.cat((y, self.cv2(y)), 1)

def forward(self, x):
    """Forward process."""
    id_out = 0 if self.bn is None else self.bn(x)
    return self.act(self.conv1(x) + self.conv2(x) + id_out)

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

def fuse_convs(self):
    """Combines two convolution layers into a single layer and removes unused attributes from the class."""
    if hasattr(self, "conv"):
        return
    kernel, bias = self.get_equivalent_kernel_bias()
    self.conv = nn.Conv2d(
        in_channels=self.conv1.conv.in_channels,
        out_channels=self.conv1.conv.out_channels,
        kernel_size=self.conv1.conv.kernel_size,
        stride=self.conv1.conv.stride,
        padding=self.conv1.conv.padding,
        dilation=self.conv1.conv.dilation,
        groups=self.conv1.conv.groups,
        bias=True,
    ).requires_grad_(False)
    self.conv.weight.data = kernel
    self.conv.bias.data = bias
    for para in self.parameters():
        para.detach_()
    self.__delattr__("conv1")
    self.__delattr__("conv2")
    if hasattr(self, "nm"):
        self.__delattr__("nm")
    if hasattr(self, "bn"):
        self.__delattr__("bn")
    if hasattr(self, "id_tensor"):
        self.__delattr__("id_tensor")

def get_equivalent_kernel_bias(self):
    """Returns equivalent kernel and bias by adding 3x3 kernel, 1x1 kernel and identity kernel with their biases."""
    kernel3x3, bias3x3 = self._fuse_bn_tensor(self.conv1)
    kernel1x1, bias1x1 = self._fuse_bn_tensor(self.conv2)
    kernelid, biasid = self._fuse_bn_tensor(self.bn)
    return kernel3x3 + self._pad_1x1_to_3x3_tensor(kernel1x1) + kernelid, bias3x3 + bias1x1 + biasid

def forward(self, x: torch.Tensor) -> torch.Tensor:
    """Applies forward pass using activation on convolutions of the input, optionally using batch normalization."""
    return x * self.act(self.fc(self.pool(x)))

def forward(self, x):
    """Apply channel and spatial attention on input for feature recalibration."""
    return x * self.act(self.cv1(torch.cat([torch.mean(x, 1, keepdim=True), torch.max(x, 1, keepdim=True)[0]], 1)))

def forward(self, x):
    """Applies the forward pass through C1 module."""
    return self.spatial_attention(self.channel_attention(x))

def forward(self, x):
    """Forward pass for the YOLOv8 mask Proto module."""
    return torch.cat(x, self.d)