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Thoughts on loss landscapes and why deep learning works

beren.io · 2,698 words · saved by 1 readers

Epistemic status: Pretty uncertain. I don’t have an expert level understanding of current views in the science of deep learning about why optimization works but just read papers as an amateur. Some of the arguments I present here might be already either known or disproven. If so please let me know! There are essentially two fundamental questions in the science of deep learning: 1.) Why are models trainable? And 2.) Why do models generalize? The answer to both of these questions relates to the nature and basic geometry of the loss landscape which is ultimately determined by the computational architecture of the model. Here I present my personal and fairly idiosyncratic and speculative answers to these questions and present what I think are fairly novel answers for both of these questions. Let’s get started. First let’s think about the first question: Why are deep learning models trainable at all? A-priori, they shouldn’t be. Deep neural networks are fundamentally solving extremely high

Epistemic status : Pretty uncertain. I don’t have an expert level understanding of current views in the science of deep learning about why optimization works but just read papers as an amateur. Some of the arguments I present here might be already either known or disproven. If so please let me know! There are essentially two fundamental questions in the science of deep learning: 1.) Why are models trainable? And 2.) Why do models generalize? The answer to both of these questions relates to the nature and basic geometry of the loss landscape which is ultimately determined by the computational a

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