Relation between biasing scale and encoded file size.

Description.md

Biasing RDO using scale s_1

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

Notes.md

Mean Squared Error

MSE = (Sum(biased_encode - unbiased_encode) ^ 2) / n

Mean Squared Relative error

MSRE = (Sum((biased_encode - unbiased_encode) / unbiased_encode) ^ 2) / n

scale-vs-file_size.ipynb

scale-vs-mse.ipynb