Relative fisher information and natural gradient for learning large modular models

Sun, Ke; Nielsen, Frank

Relative fisher information and natural gradient for learning large modular models

Files

sun17b.pdf (1.3 MB)

Type

Conference Paper

Authors

Sun, Ke
Nielsen, Frank

KAUST Department

Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Date

2017-01-01

Abstract

Fisher information and natural gradient provided deep insights and powerful tools to artificial neural networks. However related analysis becomes more and more difficult as the learner's structure turns large and complex. This paper makes a preliminary step towards a new direction. We extract a local component from a large neural system, and define its relative Fisher information metric that describes accurately this small component, and is invariant to the other parts of the system. This concept is important because the geometry structure is much simplified and it can be easily applied to guide the learning of neural networks. We provide an analysis on a list of commonly used components, and demonstrate how to use this concept to further improve optimization.

Acknowledgements

The authors would like to thank the anonymous reviewers and Yann Ollivier for the helpful comments. This work was mainly conducted when the first author was a postdoctoral researcher at Ecole Polytechnique.