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Zhe Xu

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#artificial intelligence Preprint Oct 2026

ImproveAnyTask: An Autonomous Post-Training Harness for Iterative Model Self-Improvement

Adapting general-purpose large language models to specific tasks requires substantial human effort in designing data and training strategies. Sustaining improvement is especially challenging because model updates change the error distribution, requiring strategies to be continually refined. We introduce ImproveAnyTask,...

Xing-Bo Yao, Xiao-Man Wang, Zheng-Wu Lei et al. · 0 citations
Jul 2026

Tokenizing Numerical and Embedding Features for LLM RecSys

Experiments on three Amazon recommendation benchmarks show that soft-token fusion improves retrieval performance over LLM-based baselines, and that interaction-based fusion is more effective than direct concatenation of heterogeneous soft tokens.

Zhe Xu, Ankit Peshin, Chiyu Zhang et al. · 0 citations
Jul 2026

The Case Against Generation for Retrieval: Discriminative Language Models as Effective Retrievers

Large Language Models (LLMs) have emerged as powerful assets for recommender systems. However, deploying them as generative recommenders or zero-shot rankers at web-scale remains bottlenecked by prohibitive computational overhead and grounding challenges. In this paper, we revitalize the classic, highly efficient two-t...

Zhe Xu, Prachi Agrawal, Kavosh Asadi et al. · 0 citations

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