Function linear_raw 

pub fn linear_raw(
    x: &[f64],
    w: &[f64],
    bias: &[f64],
    out: &mut [f64],
    outer: usize,
    in_f: usize,
    out_f: usize,
)

Linear projection: Y[outer, out_f] = X[outer, in_f] @ W^T[out_f, in_f] + bias[out_f]