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Ling-Xiao Qu

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#machine learning Preprint Sep 2026

A Kernel-Based Modular Discriminant Analysis Framework for Small-Sample Learning

The small-sample-size (SSS) problem remains a fundamental challenge in machine learning when labeled data are scarce due to cost, accessibility, or ethical constraints. While numerous approaches have been proposed, existing methods often struggle to maintain stable and discriminative representations under high-dimensio...

Ling-Xiao Qu, Yan Pei · 1 citation
#machine learning Preprint Sep 2026

Exact Degeneracy Under Balanced k-Shot Sampling:Consequences for Small-Sample Discriminant Analysis on LLM Embeddings

Balanced k-shot sampling draws exactly k labeled examples per class. We show that it induces an exact, provable degeneracy in a family of small-sample discriminant estimators. Under balanced sampling, the within-class scatter operator of Kernelized Linear Principal Component Discriminant Analysis (KLPCDA) is not merely...

Ling-Xiao Qu · 0 citations

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