Chromatic PAC-Bayes Bounds for Non-IID Data

Liva Ralaivola, Marie Szafranski, Guillaume Stempfel
; Proceedings of the Twelth International Conference on Artificial Intelligence and Statistics, PMLR 5:416-423, 2009.

Abstract

Pac-Bayes bounds are among the most accurate generalization bounds for classifiers learned with IID data, and it is particularly so for margin classifiers. However, there are many practical cases where the training data show some dependencies and where the traditional IID assumption does not apply. Stating generalization bounds for such frameworks is therefore of the utmost interest, both from theoretical and practical standpoints. In this work, we propose the first – to the best of our knowledge – \pac-Bayes generalization bounds for classifiers trained on data exhibiting dependencies. The approach undertaken to establish our results is based on the decomposition of a so-called dependency graph that encodes the dependencies within the data, in sets of independent data, through the tool of graph fractional covers. Our bounds are very general, since being able to find an upper bound on the (fractional) chromatic number of the dependency graph is sufficient to get new \pac-Bayes bounds for specific settings. We show how our results can be used to derive bounds for bipartite ranking and windowed prediction on sequential data.

Cite this Paper


BibTeX
@InProceedings{pmlr-v5-ralaivola09a, title = {Chromatic PAC-Bayes Bounds for Non-IID Data}, author = {Liva Ralaivola and Marie Szafranski and Guillaume Stempfel}, booktitle = {Proceedings of the Twelth International Conference on Artificial Intelligence and Statistics}, pages = {416--423}, year = {2009}, editor = {David van Dyk and Max Welling}, volume = {5}, series = {Proceedings of Machine Learning Research}, address = {Hilton Clearwater Beach Resort, Clearwater Beach, Florida USA}, month = {16--18 Apr}, publisher = {PMLR}, pdf = {http://proceedings.mlr.press/v5/ralaivola09a/ralaivola09a.pdf}, url = {http://proceedings.mlr.press/v5/ralaivola09a.html}, abstract = {Pac-Bayes bounds are among the most accurate generalization bounds for classifiers learned with IID data, and it is particularly so for margin classifiers. However, there are many practical cases where the training data show some dependencies and where the traditional IID assumption does not apply. Stating generalization bounds for such frameworks is therefore of the utmost interest, both from theoretical and practical standpoints. In this work, we propose the first – to the best of our knowledge – \pac-Bayes generalization bounds for classifiers trained on data exhibiting dependencies. The approach undertaken to establish our results is based on the decomposition of a so-called dependency graph that encodes the dependencies within the data, in sets of independent data, through the tool of graph fractional covers. Our bounds are very general, since being able to find an upper bound on the (fractional) chromatic number of the dependency graph is sufficient to get new \pac-Bayes bounds for specific settings. We show how our results can be used to derive bounds for bipartite ranking and windowed prediction on sequential data.} }
Endnote
%0 Conference Paper %T Chromatic PAC-Bayes Bounds for Non-IID Data %A Liva Ralaivola %A Marie Szafranski %A Guillaume Stempfel %B Proceedings of the Twelth International Conference on Artificial Intelligence and Statistics %C Proceedings of Machine Learning Research %D 2009 %E David van Dyk %E Max Welling %F pmlr-v5-ralaivola09a %I PMLR %J Proceedings of Machine Learning Research %P 416--423 %U http://proceedings.mlr.press %V 5 %W PMLR %X Pac-Bayes bounds are among the most accurate generalization bounds for classifiers learned with IID data, and it is particularly so for margin classifiers. However, there are many practical cases where the training data show some dependencies and where the traditional IID assumption does not apply. Stating generalization bounds for such frameworks is therefore of the utmost interest, both from theoretical and practical standpoints. In this work, we propose the first – to the best of our knowledge – \pac-Bayes generalization bounds for classifiers trained on data exhibiting dependencies. The approach undertaken to establish our results is based on the decomposition of a so-called dependency graph that encodes the dependencies within the data, in sets of independent data, through the tool of graph fractional covers. Our bounds are very general, since being able to find an upper bound on the (fractional) chromatic number of the dependency graph is sufficient to get new \pac-Bayes bounds for specific settings. We show how our results can be used to derive bounds for bipartite ranking and windowed prediction on sequential data.
RIS
TY - CPAPER TI - Chromatic PAC-Bayes Bounds for Non-IID Data AU - Liva Ralaivola AU - Marie Szafranski AU - Guillaume Stempfel BT - Proceedings of the Twelth International Conference on Artificial Intelligence and Statistics PY - 2009/04/15 DA - 2009/04/15 ED - David van Dyk ED - Max Welling ID - pmlr-v5-ralaivola09a PB - PMLR SP - 416 DP - PMLR EP - 423 L1 - http://proceedings.mlr.press/v5/ralaivola09a/ralaivola09a.pdf UR - http://proceedings.mlr.press/v5/ralaivola09a.html AB - Pac-Bayes bounds are among the most accurate generalization bounds for classifiers learned with IID data, and it is particularly so for margin classifiers. However, there are many practical cases where the training data show some dependencies and where the traditional IID assumption does not apply. Stating generalization bounds for such frameworks is therefore of the utmost interest, both from theoretical and practical standpoints. In this work, we propose the first – to the best of our knowledge – \pac-Bayes generalization bounds for classifiers trained on data exhibiting dependencies. The approach undertaken to establish our results is based on the decomposition of a so-called dependency graph that encodes the dependencies within the data, in sets of independent data, through the tool of graph fractional covers. Our bounds are very general, since being able to find an upper bound on the (fractional) chromatic number of the dependency graph is sufficient to get new \pac-Bayes bounds for specific settings. We show how our results can be used to derive bounds for bipartite ranking and windowed prediction on sequential data. ER -
APA
Ralaivola, L., Szafranski, M. & Stempfel, G.. (2009). Chromatic PAC-Bayes Bounds for Non-IID Data. Proceedings of the Twelth International Conference on Artificial Intelligence and Statistics, in PMLR 5:416-423

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