LeanMachineLearning

Bandits.ucbWidth'πŸ”—

Definition

The exploration bonus of the UCB algorithm, which corresponds to the width of a confidence interval.

πŸ”—def
Bandits.ucbWidth' {K : β„•} (c : ℝ) (n : β„•)
  (h : β†₯(Finset.Iic n) β†’ Fin K Γ— ℝ) (a : Fin K) : ℝ
Bandits.ucbWidth' {K : β„•} (c : ℝ) (n : β„•)
  (h : β†₯(Finset.Iic n) β†’ Fin K Γ— ℝ)
  (a : Fin K) : ℝ

Code

noncomputable def ucbWidth' (c : ℝ) (n : β„•) (h : Iic n β†’ Fin K Γ— ℝ) (a : Fin K) : ℝ := √(2 * c * log (n + 2) / pullCount' n h a)

Actions: Source Β· Open Issue

Meaning last changed in v4.34.0-rc2-1-g439785b (2026-08-23), the 2th recorded change.

Self-contained, with its dependencies inlined and proofs replaced by sorry: download the raw file Β· open it in the Lean web editor.

Dependency graph

Audit surface: 1 project declarations, 38 external constants

βœ“ Proved: no sorry anywhere in its closure

This is the tool's own reading of one build's recorded axioms, and it is not robust against an author who wants it to pass. Checking meant to be relied on should go through Comparator, which replays the proof through the kernel from an export against an explicit list of permitted axioms.