Tighter Learning Guarantees on Digital Computers via Concentration of Measure on Finite Spaces
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Abstract (arXiv)
Machine learning models with inputs in a Euclidean space ℝd, when implemented on digital computers, generalize, and their generalization gap converges to 0 at a rate of c/N1/2 concerning the sample size N. However, the constant c>0 obtained through classical methods can be large in terms of the ambient dimension d and machine precision, posing a challenge when N is small to realistically large. In this paper, we derive a family of generalization bounds cm/N1/(2vee m)m=1∞ tailored for learning models on digital computers, which adapt to both the sample size N and the so-called geometric representation dimension m of the discrete learning problem. Adjusting the parameter m according to N results in significantly tighter generalization bounds for practical sample sizes N, while setting m small maintains the optimal dimension-free worst-case rate of O(1/N1/2). Notably, cm∈ O(m1/2) for learning models on discretized Euclidean domains. Furthermore, our adaptive generalization bounds are formulated based on our new non-asymptotic result for concentration of measure in finite metric spaces, established via leveraging metric embedding arguments.
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References · 37
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