Question about transform after the ellipsoid fitting operation

[Lyshen]

Hello, I have a question about the transform after the ellipsoid fitting operation. As we know, the ellipsoid fitting module is used for modeling the distortion of the magnetic sensor on the device. It seems that, the code here just give the result of the ellipsoid, but the way of using the estimated ellipsoid to transform from the raw magnetic sensor data (containing distortion) to the magnetic sensor data without distortion is clear for me. Would you mind telling me the transform method? Thank you very much >_<!!!