Function susep_net 

pub fn susep_net(
    local_field_ppm: &[f64],
    qsm: &[f64],
    r2prime: &[f64],
    mask: &[u8],
    grid: &Grid,
    model_onnx: &[u8],
    norm: &SusepNetNorm,
    params: &SusepNetParams,
    progress: impl FnMut(usize, usize),
) -> Result<ChiSepMaps, OnnxError>

Run SUSEP-Net χ-separation.

• local_field_ppm, qsm (χ_total, ppm), r2prime (Hz) — column-major (nx,ny,nz).
• mask — binary brain mask (same layout).
• model_onnx — bytes of the exported susep-net.onnx.
• norm — training normalization constants.
• params — whole volume or sliding-window patch; see SusepNetParams.
• progress — progress callback (patches_done, patches_total); a whole-volume run reports a single patch.

Returns (chi_pos ≥ 0, chi_neg ≤ 0, chi_total = chi_pos + chi_neg) in ppm, masked, in the same layout.