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Re:Form -- Reducing Human Annotations in Scalable Formal Software Verification with RL in LLMs: A Preliminary Study on Dafny

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arxiv 2507.16331 v4 pith:IZGHA42X submitted 2025-07-22 cs.CL

Re:Form -- Reducing Human Annotations in Scalable Formal Software Verification with RL in LLMs: A Preliminary Study on Dafny

classification cs.CL
keywords formallanguagemodelsdafnyllmsreasoningverificationhuman
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Existing informal language-based (e.g., human language) Large Language Models (LLMs) trained with Reinforcement Learning (RL) face a significant challenge: their verification processes, which provide crucial training signals, are neither reliable nor scalable. In fact, the prevalent large proprietary models could hardly generate verifiable programs. A promising yet largely uncharted alternative is formal language-based reasoning. Grounding LLMs in rigorous formal systems where generative models operate in formal language spaces (e.g., Dafny) enables the automatic and mathematically provable verification of their reasoning processes and outcomes. This capability is pivotal for achieving large-scale, reliable formal software verification. It is a common practice to employ human-annotated chain-of-thought and answers to induce the reasoning and coding capabilities of LLMs. Unfortunately, it becomes unacceptably all-consuming to provide such priors for supervising complex programming tasks. In this work, we systematically explore ways to reduce human annotations with the formal language, Dafny, as the main environment for our pilot study. Our pipeline mainly relies on introducing an automatic and scalable data curation pipeline, and careful RL designs integrated with feedback from the formal language verifier. We introduce DafnyComp, a benchmark of compositional formal programs with auto-formalized specifications for specification reasoning. Our supervised fine-tuning (SFT) stage enables even small models (e.g., 0.5B) to generate syntactically valid and verifiable Dafny code, surpassing proprietary models. RL with regularization further improves performance, achieving stronger generalization to out-of-domain tasks and outperforming all strong baselines on the challenging DafnyComp benchmark.

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Cited by 7 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. SpecRL: Reinforcement Learning with Test-Based Completeness Rewards for Formal Specification Synthesis

    cs.SE 2026-04 unverdicted novelty 6.0

    Reinforcement learning with spectest completeness rewards lifts a 7B model’s Dafny specification verification success and completeness over supervised fine-tuning by about 50% and 26%.

  2. Differentiable Evolutionary Reinforcement Learning

    cs.AI 2025-12 unverdicted novelty 6.0

    DERL is a differentiable bi-level method that evolves optimal reward structures for RL policies by composing atomic primitives and using meta-gradients from validation performance.

  3. Automating Formal Verification with Reinforcement Learning and Recursive Inference

    cs.LG 2026-05 unverdicted novelty 5.0

    RLVR training raises verified Dafny pass rates from 9.7% to 31.1% on a filtered benchmark while a Lean proof scaffold lifts success from 46.2% to 69.2% on a pilot set and solves 7 of 42 prior unsolved tasks.

  4. SpecRL: Reinforcement Learning with Test-Based Completeness Rewards for Formal Specification Synthesis

    cs.SE 2026-04 unverdicted novelty 5.0

    SpecRL uses the fraction of negative tests rejected by candidate specifications as a reward signal in RL training to produce stronger and more verifiable formal specifications than prior methods.

  5. Rethinking Agentic Reinforcement Learning In Large Language Models

    cs.AI 2026-04 unverdicted novelty 3.0

    The paper reviews conceptual foundations, methodological innovations, effective designs, critical challenges, and future directions for LLM-based Agentic Reinforcement Learning.

  6. Rethinking Agentic Reinforcement Learning In Large Language Models

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    This review synthesizes conceptual foundations, methods, challenges, and future directions for agentic reinforcement learning in large language models.

  7. Rethinking Agentic Reinforcement Learning In Large Language Models

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    The paper surveys the conceptual foundations, methodological innovations, challenges, and future directions of agentic reinforcement learning frameworks that embed cognitive capabilities like meta-reasoning and self-r...