std.belief

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belief

std.belief — Beta-Bernoulli confidence tracking (design ⑤).

A first-class calibrated-confidence type: each observation is a soft Bernoulli update (alpha += conf, beta += 1 - conf). Replaces a hand-rolled ~120-line BeliefTracker. The prior is parametrizable — prior() is the uniform Beta(1,1); prior_with(a, b) sets any prior — nothing about the distribution is hardcoded in the runtime.

struct Belief

Fields

field	type	descriptor
alpha	f64
beta	f64
history	list[f64]

prior

def prior() -> Belief !{}

Returns Belief

Effects !{}

prior_with

def prior_with(alpha: f64, beta: f64) -> Belief !{}

Parameters

name	type
alpha	f64
beta	f64

Returns Belief

Effects !{}