pub fn conv_bn<D: Float>(
c_in: usize,
c_out: usize,
k: usize,
s: usize,
g: usize,
) -> impl Fn(SymTensor) -> SymTensorExpand description
Conv2d(groups) → BatchNorm2d — no activation.
Used for layers in PSABlock that skip the SiLU activation (qkv, pe, proj, ffn1).
g=1 for standard 1×1 convs; g=c_in=c_out for depthwise.
BN eps=0.001 matching the pretrained YOLO26n weights.