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Junjielong Xu

The Chinese University of Hong Kong, Shenzhen

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#machine learning Preprint Oct 2026

CodeLift: Your Test Suite Is Secretly a Dense SWE Curriculum

The pass-all-test binary reward has become a standard recipe for training software engineering agents, but its sparsity eliminates difference of partially correct patches. The test pass-rate is a natural alternative. However, we find that it is not a reliable indicator of patch quality. A functionality being tested can...

Junjielong Xu, Hua-Chao Zhu, Alyssa Wu et al. · 0 citations
Review Aug 2026

Beyond Fault Localization: A Trajectory-Level Study of LLM Agents for Microservice Root Cause Analysis

DiagGuard is operationalized as DiagGuard, a two-stage defense-in-depth architecture in which grounding surveys available observations before localization and verification audits the diagnosis against them, showing that trajectory-level evaluation exposes limitations hidden by final-answer metrics and provides actionab...

Qisheng Lu, Ao-Yang Fang, Junjielong Xu et al. · 0 citations
Jul 2026

PAIChecker: Uncovering and Checking PR-Issue Misalignment in SWE-Bench-Like Benchmarks

PAIChecker, a multi-agent system for checking PR-Issue misalignment in SWE-bench-like benchmarks, adopts a three-phase design that combines specific pattern identification, cross-agent label synthesis, and code-level validation, thereby enabling more accurate, generalizable, and progressively verified detection.

Manyi Wang, Junjielong Xu, Pinjia He · 0 citations

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