Title: On Data-Dependent Random Features for Improved Generalization in Supervised Learning,
Abstract: The randomized-feature approach has been successfully employed in large-scale
kernel approximation and supervised learning. The distribution from which the
random features are drawn impacts the number of features required to
efficiently perform a learning task. Recently, it has been shown that employing
data-dependent randomization improves the performance in terms of the required
number of random features. In this paper, we are concerned with the
randomized-feature approach in supervised learning for good generalizability.
We propose the Energy-based Exploration of Random Features (EERF) algorithm
based on a data-dependent score function that explores the set of possible
features and exploits the promising regions. We prove that the proposed score
function with high probability recovers the spectrum of the best fit within the
model class. Our empirical results on several benchmark datasets further verify
that our method requires smaller number of random features to achieve a certain
generalization error compared to the state-of-the-art while introducing
negligible pre-processing overhead. EERF can be implemented in a few lines of
code and requires no additional tuning parameters.