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Bei Chen

31 accepted papers

2026

A$^2$Search: Ambiguity-Aware Question Answering with Reinforcement Learning

ICLR 2026poster

Recent advances in Large Language Models (LLMs) and Reinforcement Learning (RL) have led to strong performance in open-domain question answering (QA). However, existing models still struggle with questions that admit multiple valid answers. Standard QA benchmarks, which typically assume a single gol…

Cited by 0SourcecodeScholar
2026

DualMirage: Hunting Stealthy Multimodal LLM Agents via CAPTCHAs with Contour and Adversarial Illusions

CVPR 2026

The rapid advancement of Multimodal Large Language Models (MLLMs) has given rise to sophisticated autonomous agents capable of performing complex, human-like tasks across the web. However, this also introduces significant security risks, particularly from stealthy MLLM agents that can evade conventi

Cited by 0SourceScholar
2025

Aria-UI: Visual Grounding for GUI Instructions

ACL 2025finding

Digital agents for automating tasks across different platforms by directly manipulating the GUIs are increasingly important. For these agents, grounding from language instructions to target elements remains a significant challenge due to reliance on HTML or AXTree inputs. In this paper, we introduce…

Cited by 0SourcePDFScholar
2025

Generative Frame Sampler for Long Video Understanding

ACL 2025finding

Despite recent advances in Video Large Language Models (VideoLLMs), effectively understanding long-form videos remains a significant challenge. Perceiving lengthy videos containing thousands of frames poses substantial computational burden. To mitigate this issue, this paper introduces Generative Fr…

2025

ProBench: Judging Multimodal Foundation Models on Open-ended Multi-domain Expert Tasks

ACL 2025finding

Solving expert-level multimodal tasks is a key milestone in general intelligence. As the capabilities of multimodal large language models (MLLMs) continue to evolve, evaluation of frontier multimodal intelligence becomes necessary yet challenging. In this work, we introduce ProBench, a benchmark of…

Cited by 0SourcePDFScholar
2024

Efficient Performance Tracking: Leveraging Large Language Models for Automated Construction of Scientific Leaderboards

EMNLP 2024main

Scientific leaderboards are standardized ranking systems that facilitate evaluating and comparing competitive methods. Typically, a leaderboard is defined by a task, dataset, and evaluation metric (TDM) triple, allowing objective performance assessment and fostering innovation through benchmarking.…

2024

LongVideoBench: A Benchmark for Long-context Interleaved Video-Language Understanding

NeurIPS 2024poster

Large multimodal models (LMMs) are processing increasingly longer and richer inputs. Albeit the progress, few public benchmark is available to measure such development. To mitigate this gap, we introduce LongVideoBench, a question-answering benchmark that features video-language interleaved inputs u…

2023

CodeT: Code Generation with Generated Tests

ICLR 2023poster

The task of generating code solutions for a given programming problem can benefit from the use of pre-trained language models such as Codex, which can produce multiple diverse samples. However, a major challenge for this task is to select the most appropriate solution from the multiple samples gener…

2023

Does Deep Learning Learn to Abstract? A Systematic Probing Framework

ICLR 2023poster

Abstraction is a desirable capability for deep learning models, which means to induce abstract concepts from concrete instances and flexibly apply them beyond the learning context. At the same time, there is a lack of clear understanding about both the presence and further characteristics of this ca…

2023

How Do In-Context Examples Affect Compositional Generalization?

ACL 2023long

Compositional generalization–understanding unseen combinations of seen primitives–is an essential reasoning capability in human intelligence. The AI community mainly studies this capability by fine-tuning neural networks on lots of training samples, while it is still unclear whether and how in-conte…

2023

Large Language Models Meet NL2Code: A Survey

ACL 2023long

The task of generating code from a natural language description, or NL2Code, is considered a pressing and significant challenge in code intelligence. Thanks to the rapid development of pre-training techniques, surging large language models are being proposed for code, sparking the advances in NL2Cod…

2023

Making Language Models Better Reasoners with Step-Aware Verifier

ACL 2023long

Few-shot learning is a challenging task that requires language models to generalize from limited examples. Large language models like GPT-3 and PaLM have made impressive progress in this area, but they still face difficulties in reasoning tasks such as GSM8K, a benchmark for arithmetic problems. To…

Cited by 185SourcePDFScholar
2023

Question Answering as Programming for Solving Time-Sensitive Questions

EMNLP 2023long main

Question answering plays a pivotal role in human daily life because it involves our acquisition of knowledge about the world. However, due to the dynamic and ever-changing nature of real-world facts, the answer can be completely different when the time constraint in the question changes. Recently, L…

Cited by 0SourcecodeScholar
2023

Reducing cohort bias in natural language understanding systems with targeted self-training scheme

ACL 2023industry

Bias in machine learning models can be an issue when the models are trained on particular types of data that do not generalize well, causing under performance in certain groups of users. In this work, we focus on reducing the bias related to new customers in a digital voice assistant system. It is o…

Cited by 2SourcePDFScholar
2023

RepoCoder: Repository-Level Code Completion Through Iterative Retrieval and Generation

EMNLP 2023long main

The task of repository-level code completion is to continue writing the unfinished code based on a broader context of the repository. While for automated code completion tools, it is difficult to utilize the useful information scattered in different files. We propose RepoCoder, a simple, generic, an…

Cited by 0SourcecodeScholar
2023

Skill-Based Few-Shot Selection for In-Context Learning

EMNLP 2023long main

*In-context learning* is the paradigm that adapts large language models to downstream tasks by providing a few examples. *Few-shot selection*---selecting appropriate examples for each test instance separately---is important for in-context learning. In this paper, we propose **Skill-KNN**, a skill-ba…

Cited by 0SourceScholar
2022

AdapterShare: Task Correlation Modeling with Adapter Differentiation

EMNLP 2022main

Thanks to the development of pre-trained language models, multitask learning (MTL) methods achieve a great success in natural language understanding area.However, current MTL methods pay more attention to task selection or model design to fuse as much knowledge as possible, while intrinsic task corr…

2022

CERT: Continual Pre-training on Sketches for Library-oriented Code Generation

IJCAI 2022poster

Code generation is a longstanding challenge, aiming to generate a code snippet based on a natural language description. Usually, expensive text-code paired data is essential for training a code generation model. Recently, thanks to the success of pre-training techniques, large language models are tr…

2022

LEMON: Language-Based Environment Manipulation via Execution-Guided Pre-training

EMNLP 2022finding

Language-based environment manipulation requires agents to manipulate the environment following natural language instructions, which is challenging due to the huge space of the environments.To address this challenge, various approaches have been proposed in recent work. Although these approaches wor…

Cited by 7SourcePDFScholar
2022

Multi-task Learning for Paraphrase Generation With Keyword and Part-of-Speech Reconstruction

ACL 2022findings

Paraphrase generation using deep learning has been a research hotspot of natural language processing in the past few years. While previous studies tackle the problem from different aspects, the essence of paraphrase generation is to retain the key semantics of the source sentence and rewrite the res…

2022

TAPEX: Table Pre-training via Learning a Neural SQL Executor

ICLR 2022poster

Recent progress in language model pre-training has achieved a great success via leveraging large-scale unstructured textual data. However, it is still a challenge to apply pre-training on structured tabular data due to the absence of large-scale high-quality tabular data. In this paper, we propose T…

2022

Unsupervised training data re-weighting for natural language understanding with local distribution approximation

EMNLP 2022industry

One of the major challenges of training Natural Language Understanding (NLU) production models lies in the discrepancy between the distributions of the offline training data and of the online live data, due to, e.g., biased sampling scheme, cyclic seasonality shifts, annotated training data coming f…

Cited by 2SourcePDFScholar
2022

When Language Model Meets Private Library

EMNLP 2022finding

With the rapid development of pre-training techniques, a number of language models have been pre-trained on large-scale code corpora and perform well in code generation. In this paper, we investigate how to equip pre-trained language models with the ability of code generation for private libraries.…

2021

Keep the Structure: A Latent Shift-Reduce Parser for Semantic Parsing

IJCAI 2021poster

Traditional end-to-end semantic parsing models treat a natural language utterance as a holonomic structure. However, hierarchical structures exist in natural languages, which also align with the hierarchical structures of logical forms. In this paper, we propose a latent shift-reduce parser, called…

Cited by 5SourcePDFScholar
2021

Revisiting Iterative Back-Translation from the Perspective of Compositional Generalization

AAAI 2021technical

Human intelligence exhibits compositional generalization (i.e., the capacity to understand and produce unseen combinations of seen components), but current neural seq2seq models lack such ability. In this paper, we revisit iterative back-translation, a simple yet effective semi-supervised method, to…

2020

A Spatial Missing Value Imputation Method for Multi-view Urban Statistical Data

IJCAI 2020poster

Large volumes of urban statistical data with multiple views imply rich knowledge about the development degree of cities. These data present crucial statistics which play an irreplaceable role in the regional analysis and urban computing. In reality, however, the statistical data divided into fine-gr…

2020

Compositional Generalization by Learning Analytical Expressions

NeurIPS 2020spotlight

Compositional generalization is a basic and essential intellective capability of human beings, which allows us to recombine known parts readily. However, existing neural network based models have been proven to be extremely deficient in such a capability. Inspired by work in cognition which argues c…

2020

How Far are We from Effective Context Modeling? An Exploratory Study on Semantic Parsing in Context

IJCAI 2020poster

Recently semantic parsing in context has received a considerable attention, which is challenging since there are complex contextual phenomena. Previous works verified their proposed methods in limited scenarios, which motivates us to conduct an exploratory study on context modeling methods under rea…

2020

RECPARSER: A Recursive Semantic Parsing Framework for Text-to-SQL Task

IJCAI 2020poster

Neural semantic parsers usually fail to parse long and complicated utterances into nested SQL queries, due to the large search space. In this paper, we propose a novel recursive semantic parsing framework called RECPARSER to generate the nested SQL query layer-by-layer. It decomposes the complicated…

Cited by 0SourcePDFScholar
2019

Depth-First Proof-Number Search with Heuristic Edge Cost and Application to Chemical Synthesis Planning

NeurIPS 2019poster

Search techniques, such as Monte Carlo Tree Search (MCTS) and Proof-Number Search (PNS), are effective in playing and solving games. However, the understanding of their performance in industrial applications is still limited. We investigate MCTS and Depth-First Proof-Number (DFPN) Search, a PNS va…

Cited by 73SourcePDFScholar