fz::HuffmanBookSpec Struct Reference

#include <huffman_stage.h>

Public Attributes
double	center = -1.0
double	scale = 32.0
double	shape = 2.0
	Exponent for GeneralizedNormal only (2.0 == Gaussian, 1.0 == Laplace).

Detailed Description

Parameters for a model-derived fixed codebook.

The model is evaluated over symbols [0, bklen) and produces a strictly positive frequency for every symbol, so every symbol is guaranteed to be codable. This is the important difference from a book trained on a sample of real data, where an unseen symbol gets no code at all.

Member Data Documentation

center

double fz::HuffmanBookSpec::center = -1.0

Distribution center in symbol space. Negative means "use bklen/2", which is where an unsigned quantizer with radius = bklen/2 puts the zero-error code.

scale

double fz::HuffmanBookSpec::scale = 32.0

Distribution width in symbols (sigma for Gaussian, b for Laplace, alpha for GeneralizedNormal). Ignored by Uniform.