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SGD on Neural Networks Learns Functions of Increasing Complexity
Dimitris Kalimeris · Gal Kaplun · Preetum Nakkiran · Benjamin Edelman · Tristan Yang · Boaz Barak · Haofeng Zhang

Thu Dec 12 10:45 AM -- 12:45 PM (PST) @ East Exhibition Hall B + C #170

We perform an experimental study of the dynamics of Stochastic Gradient Descent (SGD) in learning deep neural networks for several real and synthetic classification tasks. We show that in the initial epochs, almost all of the performance improvement of the classifier obtained by SGD can be explained by a linear classifier. More generally, we give evidence for the hypothesis that, as iterations progress, SGD learns functions of increasing complexity. This hypothesis can be helpful in explaining why SGD-learned classifiers tend to generalize well even in the over-parameterized regime. We also show that the linear classifier learned in the initial stages is ``retained'' throughout the execution even if training is continued to the point of zero training error, and complement this with a theoretical result in a simplified model. Key to our work is a new measure of how well one classifier explains the performance of another, based on conditional mutual information.

Author Information

Dimitris Kalimeris (Harvard)
Gal Kaplun (Harvard University)
Preetum Nakkiran (Harvard)
Ben Edelman (Harvard University)
Tristan Yang (Harvard University)
Boaz Barak (Harvard University)
Fred Zhang (Harvard University)

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