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Yeqin Zhang

7 accepted papers

2026

LLM-based Embeddings: Attention Values Encode Sentence Semantics Better Than Hidden States

ICML 2026poster

Sentence representations are foundational to many Natural Language Processing (NLP) applications. While recent methods leverage Large Language Models (LLMs) to derive sentence representations, most rely on final-layer hidden states, which are optimized for next-token prediction and thus often fail t…

Cited by 0SourceScholar
2026

Learning to Compress: Unlocking the Potential of Large Language Models for Text Representation

AAAI 2026technical

Text representation plays a critical role in tasks like clustering, retrieval, and other downstream applications. With the emergence of large language models (LLMs), there is increasing interest in harnessing their capabilities for this purpose. However, most of the LLMs are inherently causal and op

Cited by 0SourcePDFScholar
2025

MLAlgo-Bench: Can Machines Implement Machine Learning Algorithms?

EMNLP 2025

As machine learning (ML) application continues to expand across diverse fields, there is a rising demand for ML code generation. In this paper, we aim at a critical research question: Can machines autonomously generate ML code for sophisticated, human-designed algorithms or solutions? To answer this

Cited by 0SourcePDFScholar
2024

Mitigating the Impact of False Negative in Dense Retrieval with Contrastive Confidence Regularization

AAAI 2024technical

In open-domain Question Answering (QA), dense text retrieval is crucial for finding relevant passages to generate answers. Typically, contrastive learning is used to train a retrieval model, which maps passages and queries to the same semantic space, making similar ones closer and dissimilar ones fu…

2024

Retrospex: Language Agent Meets Offline Reinforcement Learning Critic

EMNLP 2024main

Large language models (LLMs) possess extensive knowledge and commonsense reasoning capabilities, making them valuable for creating powerful agents. However, existing LLM agent frameworks have not fully utilized past experiences for improvement. This work introduces a new LLM-based agent framework ca…

2023

Coarse-To-Fine Knowledge Selection for Document Grounded Dialogs

ICASSP 2023accepted

Multi-document grounded dialogue systems (DGDS) belong to a class of conversational agents that answer users’ requests by finding supporting knowledge from a collection of documents. Most previous studies aim to improve the knowledge retrieval model or propose more effective ways to incorporate exte…

Cited by 0SourceScholar
2022

Doc2Bot: Accessing Heterogeneous Documents via Conversational Bots

EMNLP 2022finding

This paper introduces Doc2Bot, a novel dataset for building machines that help users seek information via conversations. This is of particular interest for companies and organizations that own a large number of manuals or instruction books. Despite its potential, the nature of our task poses several…