Pattern Coding Meets Censoring: (almost) Adaptive Coding on Countable Alphabets

Abstract : Adaptive coding faces the following problem: given a collection of source classes such that each class in the collection has non-trivial minimax redundancy rate, can we design a single code which is asymptotically minimax over each class in the collection? In particular, adaptive coding makes sense when there is no universal code on the union of classes in the collection. In this paper, we deal with classes of sources over an infinite alphabet, that are characterized by a dominating envelope. We provide asymptotic equivalents for the redundancy of envelope classes enjoying a regular variation property. We finally construct a computationally efficient online prefix code, which interleaves the encoding of the so-called pattern of the message and the encoding of the dictionary of discovered symbols. This code is shown to be adaptive, within a loglogn factor, over the collection of regularly varying envelope classes. The code is both simpler and less redundant than previously described contenders. In contrast with previous attempts, it also covers the full range of slowly varying envelope classes.
Type de document :
Pré-publication, Document de travail
2016
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-01375901
Contributeur : Stephane Boucheron <>
Soumis le : lundi 3 octobre 2016 - 17:15:24
Dernière modification le : samedi 18 février 2017 - 01:20:27

Identifiants

  • HAL Id : hal-01375901, version 1
  • ARXIV : 1608.08367

Collections

Citation

Anna Ben-Hamou, Stephane Boucheron, Elisabeth Gassiat. Pattern Coding Meets Censoring: (almost) Adaptive Coding on Countable Alphabets. 2016. <hal-01375901>

Partager

Métriques

Consultations de la notice

84