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//! Feature Pyramid Network (FPN) components. //! //! Provides: //! - **`LateralConv1x1`**: 1×1 lateral convolution for channel reduction. //! - **`Fpn`**: top-down feature pyramid with nearest-neighbour upsampling //! and 3×3 smoothing convolutions. pub mod lateral; pub mod top_down; pub use lateral::{LateralConv1x1, LateralWeights}; pub use top_down::{FeatureMap, Fpn, FpnConfig};