Abstract:We study the canonical statistical task of computing the principal component from n i.i.d. data in d dimensions under (ε, δ)-differential privacy. Although extensively studied in literature, existing solutions fall short on two key aspects: (i) even for Gaussian data, existing private algorithms require the number of samples n to scale super-linearly with d, i.e., n = Ω(d 3/2 ), to obtain non-trivial results while non-private PCA requires only n = O(d), and (ii) existing techniques suffer from a non-vanishing … Show more
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