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Yuchen Fu

5 accepted papers

2026

RegionMarker: A Region-Triggered Semantic Watermarking Framework for Embedding-as-a-Service Copyright Protection

AAAI 2026technical

Embedding-as-a-Service (EaaS) is an effective and convenient deployment solution for addressing various NLP tasks. Nevertheless, recent research has shown that EaaS is vulnerable to model extraction attacks, which could lead to significant economic losses for model providers. For copyright protectio

Cited by 0SourcePDFScholar
2025

Contrastive Prompting Enhances Sentence Embeddings in LLMs through Inference-Time Steering

ACL 2025long

Extracting sentence embeddings from large language models (LLMs) is a practical direction, as it requires neither additional data nor fine-tuning. Previous studies usually focus on prompt engineering to guide LLMs to encode the core semantic information of the sentence into the embedding of the last…

2025

Steering When Necessary: Flexible Steering Large Language Models with Backtracking

NeurIPS 2025poster

Large language models (LLMs) have achieved remarkable performance across many generation tasks. Nevertheless, effectively aligning them with desired behaviors remains a significant challenge. Activation steering is an effective and cost-efficient approach that directly modifies the activations of LL…

Cited by 0SourcecodeScholar
2025

Token Prepending: A Training-Free Approach for Eliciting Better Sentence Embeddings from LLMs

ACL 2025long

Extracting sentence embeddings from large language models (LLMs) is a promising direction, as LLMs have demonstrated stronger semantic understanding capabilities. Previous studies typically focus on prompt engineering to elicit sentence embeddings from LLMs by prompting the model to encode sentence…

Cited by 0SourcePDFScholar
2024

AP-Adapter: Improving Generalization of Automatic Prompts on Unseen Text-to-Image Diffusion Models

NeurIPS 2024poster

Recent advancements in Automatic Prompt Optimization (APO) for text-to-image generation have streamlined user input while ensuring high-quality image output. However, most APO methods are trained assuming a fixed text-to-image model, which is impractical given the emergence of new models. To address…

Cited by 0SourcePDFScholar