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Process-Driven Autoformalization in Lean 4

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arxiv 2406.01940 v2 pith:CEOAA4QU submitted 2024-06-04 cs.CL cs.LGcs.LO

classification cs.CLcs.LGcs.LO
keywords textbfautoformalizationleandataformallanguagesbenchmarklanguage
verification ladder T0 review T1 audit T2 compute T3 formal

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Autoformalization, the conversion of natural language mathematics into formal languages, offers significant potential for advancing mathematical reasoning. However, existing efforts are limited to formal languages with substantial online corpora and struggle to keep pace with rapidly evolving languages like Lean 4. To bridge this gap, we propose a new benchmark \textbf{Form}alization for \textbf{L}ean~\textbf{4} (\textbf{\name}) designed to evaluate the autoformalization capabilities of large language models (LLMs). This benchmark encompasses a comprehensive assessment of questions, answers, formal statements, and proofs. Additionally, we introduce a \textbf{P}rocess-\textbf{S}upervised \textbf{V}erifier (\textbf{PSV}) model that leverages the precise feedback from Lean 4 compilers to enhance autoformalization. Our experiments demonstrate that the PSV method improves autoformalization, enabling higher accuracy using less filtered training data. Furthermore, when fine-tuned with data containing detailed process information, PSV can leverage the data more effectively, leading to more significant improvements in autoformalization for Lean 4. Our dataset and code are available at \url{https://github.com/rookie-joe/PDA}.

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Forward citations

Cited by 13 Pith papers

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

  1. FormalRx: Rectify and eXamine Semantic Failures in Autoformalization

    cs.CL 2026-07 conditional novelty 7.0 of 10

    FormalRx diagnoses Lean autoformalization failures with a 28-category SCI taxonomy and an 8B model that jointly predicts alignment, error type, location, and correction.

  2. From Solvers to Research: Large Language Model-Driven Formal Mathematics at the Research Frontier

    cs.CL 2026-07 accept novelty 6.0 of 10

    LLM formal provers must shift from competition solvers to research agents that handle open-ended, under-specified frontier mathematics under machine-checked rigor.

  3. Aria: An Agent For Retrieval and Iterative Auto-Formalization via Dependency Graph

    cs.AI 2025-10 conditional novelty 6.0 of 10

    A graph-of-thought agent with retrieval and a term-grounded semantic checker auto-formalizes research-level math statements in Lean, hitting 68.5% on ProofNet and 6/14 homological conjectures where baselines score 0.

  4. Generalized Tree Edit Distance (GTED): A Faithful Evaluation Metric for Statement Autoformalization

    cs.LG 2025-07 conditional novelty 6.0 of 10

    GTED uses tree edit distance on operator trees of standardized Lean statements to evaluate autoformalization, ranking top on miniF2F and joint-top on ProofNet.

  5. CriticLean: Critic-Guided Reinforcement Learning for Mathematical Formalization

    cs.CL 2025-07 conditional novelty 6.0 of 10

    A critic model trained with reinforcement learning judges semantic correctness of Lean 4 formalizations, and using it as a filter sharply improves autoformalization accuracy.

  6. Safe: Enhancing Mathematical Reasoning in Large Language Models via Retrospective Step-aware Formal Verification

    cs.CL 2025-06 conditional novelty 6.0 of 10

    Safe uses step-level formal verification in Lean 4, aggregated by a small LSTM and combined with process reward scores, to improve best-of-n accuracy for LLM mathematical reasoning.

  7. LLM-based Automated Theorem Proving Hinges on Scalable Synthetic Data Generation

    cs.AI 2025-05 conditional novelty 6.0 of 10

    A tree-search theorem prover trained on synthetic proof-state exploration data reaches 60.74% Pass@1 on MiniF2F and 21.18% on ProofNet using an adaptive beam size.

  8. FormalMATH: Benchmarking Formal Mathematical Reasoning of Large Language Models

    cs.AI 2025-05 conditional novelty 6.0 of 10

    FormalMATH provides 5,560 Lean4-checked math statements and shows that current LLM theorem provers solve at most 16.46% under practical budgets, with natural-language guidance sometimes reducing success.

  9. LeanFlow: A Case Study in Workflow-Driven Lean Autoformalization

    cs.AI 2026-06 conditional novelty 5.0 of 10

    Workflow control and a cached Lean verifier improve completion and token efficiency in document-to-project autoformalization.

  10. Artificial Intelligence for Mathematical Reasoning: An Integrated Survey of Language Models, Neuro-symbolic Systems, and Verified Discovery

    cs.AI 2026-06 unverdicted novelty 5.0 of 10

    An integrated survey organizing AI mathematical reasoning into informal, formal, discovery, and technique axes while cataloging benchmarks and assessing failure modes.

  11. Faithful and Robust LLM-Driven Theorem Proving for NLI Explanations

    cs.CL 2025-05 conditional novelty 5.0 of 10

    The proposed Faithful-Refiner, combining syntactic parsing, quantifier and consistency checks, logical-relation guidance, and detailed proof feedback, raises explanation refinement rates on three NLI benchmarks by lar...

  12. Hierarchical Attention Generates Better Proofs

    cs.LG 2025-04 conditional novelty 5.0 of 10

    A hierarchical attention regularizer improves pass@64 on Lean theorem proving benchmarks by about two percentage points, while its proof-complexity reduction is computed on a small subset and is less robust.

  13. Formal Mathematical Reasoning: A New Frontier in AI

    cs.AI 2024-12 conditional novelty 5.0 of 10

    Machine-checkable formal proof should become the backbone of AI mathematics, and a five-task, five-level capability roadmap can measure progress toward that goal.

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