On the Variance of the Fisher Information for Deep LearningDownload PDF

21 May 2021, 20:48 (edited 26 Oct 2021)NeurIPS 2021 PosterReaders: Everyone
  • Keywords: Fisher information, natural gradient, Cramer-Rao Lower Bound, deep learning
  • TL;DR: We explore the variance of the Fisher information matrix in the context of deep learning.
  • Abstract: In the realm of deep learning, the Fisher information matrix (FIM) gives novel insights and useful tools to characterize the loss landscape, perform second-order optimization, and build geometric learning theories. The exact FIM is either unavailable in closed form or too expensive to compute. In practice, it is almost always estimated based on empirical samples. We investigate two such estimators based on two equivalent representations of the FIM --- both unbiased and consistent. Their estimation quality is naturally gauged by their variance given in closed form. We analyze how the parametric structure of a deep neural network can affect the variance. The meaning of this variance measure and its upper bounds are then discussed in the context of deep learning.
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