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Fangyu Lei

14 accepted papers

2026

DAComp: Benchmarking Data Agents across the Full Data Intelligence Lifecycle

ICLR 2026poster

Real-world enterprise data intelligence workflows encompass data engineering that turns raw sources into analytical-ready tables and data analysis that convert those tables into decision-oriented insights. We introduce DAComp, a benchmark of 236 tasks that mirrors these complex workflows. Data engi…

Cited by 0SourceScholar
2026

DV-World: Benchmarking Data Visualization Agents in Real-World Scenarios

ICML 2026poster

Real-world data visualization (DV) requires native environmental grounding, cross-platform evolution, and proactive intent alignment. Yet, existing benchmarks often suffer from code-sandbox confinement, single-language creation-only tasks, and assumption of perfect intent. To bridge these gaps, we i…

Cited by 0SourceScholar
2026

TaREx: Reinforcement Learning for Code-Driven Table Reasoning

AAAI 2026technical

Automatically solving table reasoning tasks remains challenging due to three main factors: (1) diverse and hierarchical table structures that hinder comprehension, (2) the heavy reliance on complex logical and numerical reasoning—which makes purely text-based methods prone to hallucinations—and (3)

Cited by 0SourcePDFScholar
2025

OpenCUA: Open Foundations for Computer-Use Agents

NeurIPS 2025spotlight

Vision-language models have demonstrated impressive capabilities as computer-use agents (CUAs) capable of automating diverse computer tasks. As their commercial potential grows, critical details of the most capable CUA systems remain closed. As these agents will increasingly mediate digital interact…

Cited by 0SourceScholar
2025

Spider 2.0: Evaluating Language Models on Real-World Enterprise Text-to-SQL Workflows

ICLR 2025oral

Real-world enterprise text-to-SQL workflows often involve complex cloud or local data across various database systems, multiple SQL queries in various dialects, and diverse operations from data transformation to analytics. We introduce Spider 2.0, an evaluation framework comprising $632$ real-world…

2024

Competition-Level Problems are Effective LLM Evaluators

ACL 2024findings

Large language models (LLMs) have demonstrated impressive reasoning capabilities, yet there is ongoing debate about these abilities and the potential data contamination problem recently. This paper aims to evaluate the reasoning capacities of LLMs, specifically in solving recent competition-level pr…

Cited by 23SourcePDFScholar
2024

DA-Code: Agent Data Science Code Generation Benchmark for Large Language Models

EMNLP 2024main

We introduce DA-Code, a code generation benchmark specifically designed to assess LLMs on agent-based data science tasks. This benchmark features three core elements: First, the tasks within DA-Code are inherently challenging, setting them apart from traditional code generation tasks and demanding a…

2024

Neeko: Leveraging Dynamic LoRA for Efficient Multi-Character Role-Playing Agent

EMNLP 2024main

Large Language Models (LLMs) have revolutionized open-domain dialogue agents but encounter challenges in multi-character role-playing (MCRP) scenarios. To address the issue, we present Neeko, an innovative framework designed for efficient multiple characters imitation. Neeko employs a dynamic low-ra…

2024

OSWorld: Benchmarking Multimodal Agents for Open-Ended Tasks in Real Computer Environments

NeurIPS 2024poster

Autonomous agents that accomplish complex computer tasks with minimal human interventions have the potential to transform human-computer interaction, significantly enhancing accessibility and productivity. However, existing benchmarks either lack an interactive environment or are limited to environm…

2024

S3Eval: A Synthetic, Scalable, Systematic Evaluation Suite for Large Language Model

NAACL 2024long

The rapid development of Large Language Models (LLMs) has led to great strides in model capabilities like long-context understanding and reasoning.However, as LLMs are able to process longer contexts, it becomes more challenging to evaluate whether they have acquired certain capabilities, since the…

2024

Spider2-V: How Far Are Multimodal Agents From Automating Data Science and Engineering Workflows?

NeurIPS 2024spotlight

Data science and engineering workflows often span multiple stages, from warehousing to orchestration, using tools like BigQuery, dbt, and Airbyte. As vision language models (VLMs) advance in multimodal understanding and code generation, VLM-based agents could potentially automate these workflows by…

2024

Teaching Small Language Models to Reason for Knowledge-Intensive Multi-Hop Question Answering

ACL 2024findings

Large Language Models (LLMs) can teach small language models (SLMs) to solve complex reasoning tasks (e.g., mathematical question answering) by Chain-of-thought Distillation (CoTD). Specifically, CoTD fine-tunes SLMs by utilizing rationales generated from LLMs such as ChatGPT. However, CoTD has cert…

2023

MenatQA: A New Dataset for Testing the Temporal Comprehension and Reasoning Abilities of Large Language Models

EMNLP 2023long findings

Large language models (LLMs) have shown nearly saturated performance on many natural language processing (NLP) tasks. As a result, it is natural for people to believe that LLMs have also mastered abilities such as time understanding and reasoning. However, research on the temporal sensitivity of LLM…

Cited by 0SourcecodeScholar
2023

S3HQA: A Three-Stage Approach for Multi-hop Text-Table Hybrid Question Answering

ACL 2023short

Answering multi-hop questions over hybrid factual knowledge from the given text and table (TextTableQA) is a challenging task. Existing models mainly adopt a retriever-reader framework, which have several deficiencies, such as noisy labeling in training retriever, insufficient utilization of heterog…