NIPS Proceedingsβ

Explaining Landscape Connectivity of Low-cost Solutions for Multilayer Nets

Part of: Advances in Neural Information Processing Systems 32 (NIPS 2019)

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Conference Event Type: Poster


Mode connectivity is a surprising phenomenon in the loss landscape of deep nets. Optima---at least those discovered by gradient-based optimization---turn out to be connected by simple paths on which the loss function is almost constant. Often, these paths can be chosen to be piece-wise linear, with as few as two segments. We give mathematical explanations for this phenomenon, assuming generic properties (such as dropout stability and noise stability) of well-trained deep nets, which have previously been identified as part of understanding the generalization properties of deep nets. Our explanation holds for realistic multilayer nets, and experiments are presented to verify the theory.