Function autoqsm 

pub fn autoqsm(
    field_ppm: &[f64],
    mask: &[u8],
    grid: &Grid,
    model_onnx: &[u8],
) -> Result<Vec<f64>, OnnxError>

Run AutoQSM on a total field map.

• field_ppm — total field (ppm) in this crate’s sign convention, column-major (nx,ny,nz). It is negated internally to match the network’s training convention (see the module docs).
• mask — binary brain mask; applied to the output (AutoQSM has no brain extraction, so the raw output is whole-head).
• model_onnx — bytes of the exported autoqsm.onnx (fixed 64³→32³).

Returns susceptibility (ppm), masked, in the same layout.