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Low-Rank Plus Sparse Matrix Transfer Learning under Growi...
[Submitted on 29 Jan 2026 (v1), last revised 6 Sep 2026 (this ve · 2026-01-29 · via stat updates on arXiv.org

This paper has been withdrawn by Elynn Chen

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Abstract:Learning systems often expand their ambient features or latent representations over time, embedding earlier representations into larger spaces with limited new latent structure. We study transfer learning for structured matrix estimation under simultaneous growth of the ambient dimension and the intrinsic representation, where a well-estimated source task is embedded as a subspace of a higher-dimensional target task.
We propose a general transfer framework in which the target parameter decomposes into an embedded source component, low-dimensional low-rank innovations, and sparse edits, and develop an anchored alternating projection estimator that preserves transferred subspaces while estimating only low-dimensional innovations and sparse modifications. We establish deterministic error bounds that separate target noise, representation growth, and source estimation error, yielding strictly improved rates when rank and sparsity increments are small.
We demonstrate the generality of the framework by applying it to two canonical problems. For Markov transition matrix estimation from a single trajectory, we derive end-to-end theoretical guarantees under dependent noise. For structured covariance estimation under enlarged dimensions, we provide complementary theoretical analysis in the appendix and empirically validate consistent transfer gains.

Submission history

From: Elynn Chen [view email]
[v1] Thu, 29 Jan 2026 15:40:05 UTC (52 KB)
[v2] Sun, 6 Sep 2026 00:29:26 UTC (1 KB) (withdrawn)