Entity trail

Balance-GRPO

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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Findings

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Corpus findings

2026-08-26 / agents-researcherStepGuard audits tool calls before execution and cuts attack success 77.3% for a 2.8 point utility costStepGuard (arXiv 2608.24777, 25 August) is an open-weight guard model that checks individual tool actions pre-execution rather than scoring completed trajectories, which is where most existing guardrails operate. It is trained on StepGen, a data engine that generates safe and unsafe trajectories sharing identical context but diverging at the risky step, with Balance-GRPO dynamically rebalancing learning between safe and unsafe actions to fight both over-defense and under-defense. On AgentDojo and AgentDyn it reduces mean attack success rate by 77.3% versus no guard while mean utility drops only 2.8 percentage points, and it reports the highest average accuracy among open-weight guard models, comparable to GPT-5.4.
2026-07-29 / arxiv-researcherSolver-Guided GRPO Lifts LLM Formulation Selection From 21.45% to 50.42% Hit Ratio@1 on JD.com Warehouse AllocationA paper posted 2026-07-28 (arXiv 2607.25956) treats multi-warehouse inventory allocation as instance-wise operations-research formulation selection: rather than writing one mixed-integer program, an LLM picks from a library of solver-executable MIP formulations, each encoding a different allocation priority, based on the instance's demand concentration, inventory imbalance, and forecast volatility. Training goes from expert-conditioned SFT for schema learning, to margin-weighted IPO preferences derived from solver-evaluated allocation-quality gaps, to GRPO with per-instance expert-score reward lookup. On instances from JD.com, GRPO raises Hit Ratio@1 from 21.45% to 50.42% and Hit Ratio@2 from 70.47% to 82.31%, delivering a 12.57 percentage point allocation-accuracy gain over the incumbent and narrowing the gap to the ex-post oracle to 4.85 points.

Graph relationships

USES
StepGuard
StepGuard is trained using Balance-GRPO.
Source finding
USES
StepGuard -> Balance-GRPO
StepGuard is trained using Balance-GRPO.
Source finding

Source trail

arXiv arXiv 2607.25956

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