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Author

Xiao-Bo Guo

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#artificial intelligence Preprint Sep 2026

ContractRL: Shielded Group-Relative Policy Optimization for Auditable Tool-Call Repair

Structured tool calls often fail after only a small number of fields violate a schema or an execution contract. Regenerating the complete object enlarges the action surface and makes repeated repair difficult to audit. We introduce ContractRL, a contract-constrained sequential repair protocol that models verifier-guide...

Miao-Bo Hu, Shu-Hao Hu, Xiao-Bo Guo et al. · 0 citations
#artificial intelligence Preprint Sep 2026

VStress: Correlation-Aware Auditing and Adaptive Budget Allocation for Repeated Verifiers

Repeated verifier calls are useful only when they contribute conditional information. We introduce VStress, an auditable replay contract, and VStress-CA, a correlation-aware allocation policy that estimates the conditional marginal information of an unqueried verifier on a sealed calibration split, discounts uncertaint...

Miao-Bo Hu, Shu-Hao Hu, Xiao-Bo Guo et al. · 0 citations
Book Open access Aug 2026

Disentangled Dual-Granularity Learning for Market-Adaptive Stock Return Forecasting under Non-Stationary Environments

Deep learning has emerged as a prominent paradigm in stock return forecasting, demonstrating remarkable capabilities in extracting non-linear patterns from historical stock data. However, existing approaches often process stock features as a monolithic input with fixed temporal receptive fields. This structural inflexi...

Minghui Su, Xiao-Bo Guo, Deyu Tian et al. · 0 citations
Sep 2026

Information-Bottlenecked Variational Autoencoder for Top-N Recommendation via Gating Mechanism

Generative models for top- \(N\) recommendation have garnered significant attention, with Variational Autoencoder (VAE) emerging as a promising approach for modeling user preferences. Yet, traditional VAE-based models encounter two major challenges: simplistic priors may cause posterior collapse, resulting in ineffecti...

Xiao-Bo Guo, Shaoshuai Li, You-Ru Li et al. · 0 citations
#artificial intelligence Preprint Sep 2026

RSD-Poker: Structure-Adaptive and Shift-Robust Risk-Utility Certification for Residual Policies in Imperfect-Information Games

Residual policy adaptation provides a lightweight way to modify a strong reference policy, but a shared scale and a fixed subgroup partition can hide heterogeneous degradation and become fragile when the deployment mixture of information states changes. We introduce RSD-Poker, a structure-adaptive and shift-robust cert...

Miao-Bo Hu, Shu-Hao Hu, Xiao-Bo Guo et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Audit-First VAPO: Risk-Certified Selective Updates under Imperfect Verification

Imperfect verifiers can assign a harmful update direction even when clipping and regularization bound its magnitude. We introduce Audit-First VAPO, which separates discrete directional admission from continuous magnitude control. An observation-only accept-appeal-abstain policy uses a finite secondary-verification budg...

Miao-Bo Hu, Shu-Hao Hu, Xiao-Bo Guo et al. · 0 citations
#artificial intelligence Preprint Sep 2026

OSCC: Certified Observation-Safe Coupling Optimization for Gradient-Noise Control in Imperfect-Information Learning

Observation-safe counterfactual coupling (OSCC) is introduced, a framework that defines an admissible class through marginal preservation, information-state safety, branch-local policy randomness, semantic event alignment, and trace-before-oracle replay.

Miao-Bo Hu, Shu-Hao Hu, Xiao-Bo Guo et al. · 0 citations

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