Theory III: Dynamics and Generalization in Deep Networks — a simple solution. (arXiv:1903.04991v4 [cs.LG] UPDATED)

Classical generalization bounds for classification in the setting of
separable data can be optimized by maximizing the margin of a deep network
under the constraint of unit p-norm of the weight matrix at each layer. A
possible approach for solving numerically this problem uses gradient algorithms
on exponential-type loss functions, enforcing a unit constraint in the p-norm.
In the limiting case of continuous gradient flow, we analyze the dynamical
systems associated with three algorithms of this kind and their close relation
for $p=2$ with existing weight normalization and batch normalization
algorithms. An interesting observation is that unconstrained gradient descent
has a similar dynamics with the same critical points and thus also optimizes
the generalization bounds. Our approach extends some of the results of Srebro
from linear networks to deep networks and provides a new perspective on the
implicit bias of gradient descent. This elusive complexity control is likely to
be responsible for generalization despite overparametrization in deep networks.

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