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Related papers: Constrained Decoding for Fill-in-the-Middle Code L…

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Fill-in-the-Middle (FIM) models play a vital role in code completion tasks, leveraging both prefix and suffix context to provide more accurate and contextually relevant suggestions. This paper presents approaches to improve FIM code…

Information Retrieval · Computer Science 2024-12-24 Hitesh Sagtani , Rishabh Mehrotra , Beyang Liu

Large language models (LLMs) have shown promising performance across diverse domains. Many practical applications of LLMs, such as code completion and structured data extraction, require adherence to syntactic constraints specified by a…

Machine Learning · Computer Science 2025-08-18 Niels Mündler , Jasper Dekoninck , Martin Vechev

We introduce Syntax-Aware Fill-In-the-Middle (SAFIM), a new benchmark for evaluating Large Language Models (LLMs) on the code Fill-in-the-Middle (FIM) task. This benchmark focuses on syntax-aware completions of program structures such as…

Computation and Language · Computer Science 2024-06-25 Linyuan Gong , Sida Wang , Mostafa Elhoushi , Alvin Cheung

Large language models (LLMs) have achieved notable success in code generation. However, they still frequently produce uncompilable output because their next-token inference procedure does not model formal aspects of code. Although…

Machine Learning · Computer Science 2025-05-09 Niels Mündler , Jingxuan He , Hao Wang , Koushik Sen , Dawn Song , Martin Vechev

Fill-in-the-Middle (FIM) is a common pretraining method for code LLMs, where models complete code segments given surrounding context. However, existing LLMs treat code as plain text and mask random character spans. We propose and evaluate…

Computation and Language · Computer Science 2025-06-03 Linyuan Gong , Alvin Cheung , Mostafa Elhoushi , Sida Wang

To ensure that text generated by large language models (LLMs) is in an expected format, constrained decoding proposes to enforce strict formal language constraints during generation. However, as we show in this work, not only do such…

Machine Learning · Computer Science 2024-03-13 Luca Beurer-Kellner , Marc Fischer , Martin Vechev

This work introduces (1) a technique that allows large language models (LLMs) to leverage user-provided code when solving programming tasks and (2) a method to iteratively generate modular sub-functions that can aid future code generation…

Machine Learning · Computer Science 2023-12-05 Patrick Hajali , Ignas Budvytis

Large Language Models (LLMs) have significantly advanced code completion, yet they often fail when the developer's intent is underspecified in the code context. To address this, developers usually add natural language instructions (e.g.,…

Software Engineering · Computer Science 2025-10-14 Zhensu Sun , Chengran Yang , Chao Peng , Pengfei Gao , Xiaoning Du , Li Li , David Lo

Language models have become the backbone of today's AI systems. However, their predominant left-to-right generation limits the use of bidirectional context, which is essential for tasks that involve filling text in the middle. We propose…

Computation and Language · Computer Science 2023-10-17 Tianxiao Shen , Hao Peng , Ruoqi Shen , Yao Fu , Zaid Harchaoui , Yejin Choi

Code completion is a prominent application of Large Language Models (LLMs) in software engineering. Due to the near real-time response requirements of this task, base models with small to medium-sized parameters are typically employed,…

Software Engineering · Computer Science 2025-09-18 Dongjun Yu , Xiao Yan , Zhenrui Li , Jipeng Xiao , Haochuan He , Yongda Yu , Hao Zhang , Guoping Rong , Xiaobo Huang

Controlling the output of Large Language Models (LLMs) through context-sensitive constraints has emerged as a promising approach to overcome the limitations of Context-Free Grammars (CFGs) in guaranteeing generation validity. However, such…

Computation and Language · Computer Science 2026-04-14 Mohammad Albinhassan , Pranava Madhyastha , Mark Law , Alessandra Russo

Natural generation allows Large Language Models (LLMs) to produce free-form responses with rich reasoning, yet the lack of structure makes outputs difficult to verify. Conversely, constrained decoding ensures standardized formats but can…

Computation and Language · Computer Science 2026-05-29 Ngoc Trinh Hung Nguyen , Alonso Silva , Laith Zumot , Liubov Tupikina , Armen Aghasaryan , Mehwish Alam

This survey reviews how large language models (LLMs) are transforming synthetic training data generation in both natural language and code domains. By producing artificial but task-relevant examples, these models can significantly augment…

Computation and Language · Computer Science 2025-11-21 Mihai Nadas , Laura Diosan , Andreea Tomescu

Large language models (LLMs) process entire input contexts indiscriminately, which is inefficient when the information required to answer a query is localized within the context. We present dynamic context cutoff, a novel method enabling…

Computation and Language · Computer Science 2026-02-10 Roy Xie , Junlin Wang , Paul Rosu , Chunyuan Deng , Bolun Sun , Zihao Lin , Bhuwan Dhingra

The dominant Fill-in-the-Middle (FIM) paradigm for code completion is constrained by its rigid inability to correct contextual errors and reliance on unaligned, insecure Base models. While Chat LLMs offer safety and Agentic workflows…

Software Engineering · Computer Science 2026-01-21 Jiajun Zhang , Zeyu Cui , Jiaxi Yang , Lei Zhang , Yuheng Jing , Zeyao Ma , Tianyi Bai , Zilei Wang , Qiang Liu , Liang Wang , Binyuan Hui , Junyang Lin

Large Language Models (LLMs) have shown remarkable capabilities in code generation tasks, yet they face significant limitations in handling complex, long-context programming challenges and demonstrating complex compositional reasoning…

Artificial Intelligence · Computer Science 2025-01-14 Amr Almorsi , Mohanned Ahmed , Walid Gomaa

Code generation, symbolic math reasoning, and other tasks require LLMs to produce outputs that are both syntactically and semantically correct. Constrained LLM generation is a promising direction to enforce adherence to formal grammar, but…

Programming Languages · Computer Science 2025-09-08 Debangshu Banerjee , Tarun Suresh , Shubham Ugare , Sasa Misailovic , Gagandeep Singh

Large Language Models (LLMs) have demonstrated promising capabilities for code generation. While existing benchmarks evaluate the correctness and efficiency of LLM-generated code, the potential linguistic bias - where code quality varies…

Software Engineering · Computer Science 2025-05-02 Weipeng Jiang , Xuanqi Gao , Juan Zhai , Shiqing Ma , Xiaoyu Zhang , Ziyan Lei , Chao Shen

Post-processing is crucial for the automatic evaluation of LLMs in fill-in-the-middle (FIM) code generation due to the frequent presence of extraneous code in raw outputs. This extraneous generation suggests a lack of awareness regarding…

Software Engineering · Computer Science 2025-06-11 Wasi Uddin Ahmad , Somshubra Majumdar , Boris Ginsburg

Large language models (LLMs) excel across diverse tasks but face significant deployment challenges due to high inference costs. LLM inference comprises prefill (compute-bound) and decode (memory-bound) stages, with decode dominating latency…

Artificial Intelligence · Computer Science 2025-08-13 Woojeong Kim , Junxiong Wang , Jing Nathan Yan , Mohamed Abdelfattah , Alexander M. Rush
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