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Poster
Near-Optimal SQ Lower Bounds for Agnostically Learning Halfspaces and ReLUs under Gaussian Marginals
Ilias Diakonikolas · Daniel Kane · Nikos Zarifis

Tue Dec 08 09:00 AM -- 11:00 AM (PST) @ Poster Session 1 #434
We study the fundamental problems of agnostically learning halfspaces and ReLUs under Gaussian marginals. In the former problem, given labeled examples $(\bx, y)$ from an unknown distribution on $\R^d \times \{ \pm 1\}$, whose marginal distribution on $\bx$ is the standard Gaussian and the labels $y$ can be arbitrary, the goal is to output a hypothesis with 0-1 loss $\opt+\eps$, where $\opt$ is the 0-1 loss of the best-fitting halfspace. In the latter problem, given labeled examples $(\bx, y)$ from an unknown distribution on $\R^d \times \R$, whose marginal distribution on $\bx$ is the standard Gaussian and the labels $y$ can be arbitrary, the goal is to output a hypothesis with square loss $\opt+\eps$, where $\opt$ is the square loss of the best-fitting ReLU. We prove Statistical Query (SQ) lower bounds of $d^{\poly(1/\eps)}$ for both of these problems. Our SQ lower bounds provide strong evidence that current upper bounds for these tasks are essentially best possible.

Author Information

Ilias Diakonikolas (UW Madison)
Daniel Kane (UCSD)
Nikos Zarifis (University of Wisconsin-Madison)

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