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Esther Xin

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#machine learning Preprint Sep 2026

When a Data Artifact Isn't a Shortcut: Causal Auditing of Synthetic RLVR Corpora

Several recent pipelines build RLVR training data by masking a span of real corpus text and asking a language model to invent plausible wrong answers around it. The correct option is therefore genuine human prose; every distractor is synthetic. Correctness and provenance become entangled, and a policy could in principl...

Esther Xin · 0 citations
#machine learning Preprint Sep 2026

Where the Verifier Fails: A Category-Level Audit of Reward Signals in RLVR

This work applies metamorphic testing to the verifier rather than the model, generating certified equivalent answer variants, that is, rewrites that preserve mathematical meaning by construction, so that any rejection is a provable false negative needing no human adjudication.

Esther Xin · 2 citations

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