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Software engineering agents have become essential for managing complex coding tasks, particularly in large repositories. These agents employ advanced language models to interpret natural language descriptions, analyze codebases, and implement modifications. Their applications include debugging, feature development, and optimization. The effectiveness of these systems relies on their ability to handle real-world challenges, such as interacting with extensive repositories and executing tests to validate solutions, making the development of such agents both exciting and challenging.
Lack of comprehensive training environments is one of the primary challenges in this domain. Many existing datasets and benchmarks, such as SWE-Bench and R2E, either focus on isolated problems or rely on synthetic instructions that do not represent the complexities of real-world coding tasks. For instance, while SWE-Bench offers test cases for validation, its training dataset lacks executable environments and dependency configurations. This discrepancy limits the utility of existing benchmarks for training agents capable of addressing the nuanced challenges of software engineering.
Efforts to address these challenges have previously relied on tools like HumanEval and APPS, which support isolated task evaluation but fail to integrate repository-level complexities. These tools often lack a coherent link between natural language problem descriptions, executable codebases, and comprehensive testing frameworks. As a result, there is a pressing need for a platform that can bridge these gaps by offering real-world tasks within functional and executable environments.
Researchers from UC Berkeley, UIUC, CMU, and Apple have developed SWE-Gym, a novel environment tailored for training software engineering agents. SWE-Gym integrates 2,438 Python tasks sourced from GitHub issues across 11 repositories, offering pre-configured executable environments and expert-validated test cases. This platform introduces a groundbreaking approach by combining real-world task complexity with automated testing mechanisms, creating a more effective training ecosystem for language models.
SWE-Gym’s methodology focuses on replicating real-world coding conditions. The tasks are derived from GitHub issues and paired with the corresponding repository snapshots and unit tests. Dependencies for each task are meticulously configured, ensuring the accuracy of the executable environment. These configurations were semi-manually validated through rigorous processes involving around 200 human annotation hours and 10,000 CPU core hours, resulting in a robust training dataset. The researchers also introduced a subset of 230 tasks, SWE-Gym Lite, which targets simpler and self-contained problems, enabling rapid prototyping and evaluation.
The performance evaluation of SWE-Gym demonstrated its significant impact on training software engineering agents. Using the Qwen-2.5 Coder model, fine-tuned agents achieved marked improvements in resolving tasks on SWE-Bench benchmarks. Specifically, resolve rates increased from 20.6% to 32.0% on SWE-Bench Verified and from 15.3% to 26.0% on SWE-Bench Lite. These gains represent a significant leap over previous benchmarks for open-weight language models. Furthermore, SWE-Gym-supported agents reduced failure rates in stuck-in-loop scenarios by 18.6% and improved task completion rates in real-world settings.
The researchers also explored inference-time scaling by employing a verifier trained on agent trajectories sampled from SWE-Gym. This approach allowed agents to generate multiple solution trajectories for a given problem, selecting the most promising one using a reward model. The verifier achieved a Best@K score of 32.0% on SWE-Bench Verified, demonstrating the environment’s capacity for improving agent performance through scalable compute strategies. These results emphasize the potential of SWE-Gym to enhance both the development and evaluation of software engineering agents.
SWE-Gym is a pivotal tool in advancing research on software engineering agents. Addressing the limitations of prior benchmarks and offering a scalable, realistic environment equips researchers with the resources needed to develop robust models capable of solving complex software challenges. With its open-source release, SWE-Gym paves the way for significant advancements in the field, setting new standards for the training and evaluation of software engineering agents.
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