biased_distortion = actual_distortion * (s_1 * (mean_activity as f64 / activity as f64) + s_0)
Sets encoded : subset3-y4m and objective-1-fast.
Interpolated scale is to be used as a starting point for Newton-Raphson method to derive the biasing scale as follows:
s' = s - (MSE/f'(s))
where f : s -> file_size