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Lifeng Liu

4 accepted papers

2026

Frequency-Dependent Scheduled Schrödinger Bridge for Underwater Acoustic Signal Denoising

AAAI 2026technical

Schrödinger Bridge-based diffusion models have demonstrated promising performance in signal denoising. However, since ground truth signals are unavailable during the sampling process, neural networks must be employed to learn the mapping, which breaks the theoretical coupling between diffusion and s

Cited by 0SourcePDFScholar
2026

HierSearch: A Hierarchical Enterprise Deep Search Framework Integrating Local and Web Searches

AAAI 2026technical

Recently, large reasoning models have demonstrated strong mathematical and coding abilities, and deep search leverages their reasoning capabilities in challenging information retrieval tasks. Existing deep search works are generally limited to a single knowledge source, either local or the Web. Howe

Cited by 0SourcePDFScholar
2025

Sequential Preference Optimization: Multi-Dimensional Preference Alignment with Implicit Reward Modeling

AAAI 2025technical

Human preference alignment is critical in building powerful and reliable large language models (LLMs). However, current methods either ignore the multi-dimensionality of human preferences (e.g. helpfulness and harmlessness) or struggle with the complexity of managing multiple reward models. To addre…

2024

On the Robustness of Editing Large Language Models

EMNLP 2024main

Large language models (LLMs) have played a pivotal role in building communicative AI, yet they encounter the challenge of efficient updates. Model editing enables the manipulation of specific knowledge memories and the behavior of language generation without retraining. However, the robustness of mo…