We are very happy to have He Jia (
https://sites.gatech.edu/hejia/) visiting my group
for part of this week. He is a graduating PhD student at Georgia Tech
If you want to meet with He, please send me an email to schedule it.
Please see below for He's title and abstract. Hope to see many of you there!
Title: Robustly Learning Affine Transformations with Asymptotically Optimal Error
Abstract: We present a polynomial-time algorithm for robustly learning an unknown affine transformation of the standard hypercube from samples, an important and well-studied setting for independent component analysis (ICA). Total variation distance is the information-theoretically
strongest possible notion of distance in our setting and our recovery guarantees in this distance are optimal up to the absolute constant factor multiplying the fraction of corruption. Our key innovation is a new approach to ICA (even to outlier-free ICA)
that circumvents the difficulties in the classical method of moments and instead relies on a new geometric certificate of correctness of an affine transformation. Our algorithm is based on a new method that iteratively improves an estimate of the unknown affine
transformation whenever the requirements of the certificate are not met.
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