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Fengjun Pan

4 accepted papers

2024

On the Affinity, Rationality, and Diversity of Hierarchical Topic Modeling

AAAI 2024technical

Hierarchical topic modeling aims to discover latent topics from a corpus and organize them into a hierarchy to understand documents with desirable semantic granularity. However, existing work struggles with producing topic hierarchies of low affinity, rationality, and diversity, which hampers docume…

2024

Towards the TopMost: A Topic Modeling System Toolkit

ACL 2024system demonstrations

Topic models have a rich history with various applications and have recently been reinvigorated by neural topic modeling. However, these numerous topic models adopt totally distinct datasets, implementations, and evaluations. This impedes quick utilization and fair comparisons, and thereby hinders t…

2024

Universal Vulnerabilities in Large Language Models: Backdoor Attacks for In-context Learning

EMNLP 2024main

In-context learning, a paradigm bridging the gap between pre-training and fine-tuning, has demonstrated high efficacy in several NLP tasks, especially in few-shot settings. Despite being widely applied, in-context learning is vulnerable to malicious attacks. In this work, we raise security concerns…