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Leilei Sun

16 accepted papers

2026

Behavior Tokens Speak Louder: Disentangled Explainable Recommendation with Behavior Vocabulary

AAAI 2026technical

Recent advances in explainable recommendation have explored the integration of language models to analyze natural language rationales for user–item interactions. Despite their potential, existing methods often rely on ID-based representations that obscure semantic meaning and impose structural const

Cited by 0SourcePDFScholar
2026

STAR-Bench: Probing Deep Spatio-Temporal Reasoning as Audio 4D Intelligence

ICLR 2026poster

Despite rapid progress in Multi-modal Large Language Models and Large Audio-Language Models, existing audio benchmarks largely test semantics that can be recovered from text captions, masking deficits in fine-grained perceptual reasoning. We formalize audio 4D intelligence that is defined as reasoni…

Cited by 8SourcecodeScholar
2025

RePST: Language Model Empowered Spatio-Temporal Forecasting via Semantic-Oriented Reprogramming

IJCAI 2025

Spatio-temporal forecasting is pivotal in numerous real-world applications, including transportation planning, energy management, and climate monitoring. In this work, we aim to harness the reasoning and generalization abilities of Pre-trained Language Models (PLMs) for more effective spatio-tempora

2024

An NCDE-based Framework for Universal Representation Learning of Time Series

IJCAI 2024poster

Exploiting self-supervised learning (SSL) to extract the universal representations of time series could not only capture the natural properties of time series but also offer huge help to the downstream tasks. Nevertheless, existing time series representation learning (TSRL) methods face challenges i…

2024

Improving Temporal Link Prediction via Temporal Walk Matrix Projection

NeurIPS 2024poster

Temporal link prediction, aiming at predicting future interactions among entities based on historical interactions, is crucial for a series of real-world applications. Although previous methods have demonstrated the importance of relative encodings for effective temporal link prediction, computation…

2023

Conditional Diffusion Based on Discrete Graph Structures for Molecular Graph Generation

AAAI 2023technical

Learning the underlying distribution of molecular graphs and generating high-fidelity samples is a fundamental research problem in drug discovery and material science. However, accurately modeling distribution and rapidly generating novel molecular graphs remain crucial and challenging goals. To acc…

2023

Continuous-Time Graph Learning for Cascade Popularity Prediction

IJCAI 2023poster

Information propagation on social networks could be modeled as cascades, and many efforts have been made to predict the future popularity of cascades. However, most of the existing research treats a cascade as an individual sequence. Actually, the cascades might be correlated with each other due to…

2023

Generic and Dynamic Graph Representation Learning for Crowd Flow Modeling

AAAI 2023technical

Many deep spatio-temporal learning methods have been proposed for crowd flow modeling in recent years. However, most of them focus on designing a spatial and temporal convolution mechanism to aggregate information from nearby nodes and historical observations for a pre-defined prediction task. Diffe…

2023

Human-Instructed Deep Hierarchical Generative Learning for Automated Urban Planning

AAAI 2023technical

The essential task of urban planning is to generate the optimal land-use configuration of a target area. However, traditional urban planning is time-consuming and labor-intensive. Deep generative learning gives us hope that we can automate this planning process and come up with the ideal urban plans…

Cited by 20SourcePDFScholar
2023

Predicting Temporal Sets with Simplified Fully Connected Networks

AAAI 2023technical

Given a sequence of sets, where each set contains an arbitrary number of elements, temporal sets prediction aims to predict which elements will appear in the subsequent set. Existing methods for temporal sets prediction are developed on sophisticated components (e.g., recurrent neural networks, atte…

2023

Pretraining Language Models with Text-Attributed Heterogeneous Graphs

EMNLP 2023long findings

In many real-world scenarios (e.g., academic networks, social platforms), different types of entities are not only associated with texts but also connected by various relationships, which can be abstracted as Text-Attributed Heterogeneous Graphs (TAHGs). Current pretraining tasks for Language Models…

Cited by 0SourcecodeScholar
2023

Towards Better Dynamic Graph Learning: New Architecture and Unified Library

NeurIPS 2023poster

We propose DyGFormer, a new Transformer-based architecture for dynamic graph learning. DyGFormer is conceptually simple and only needs to learn from nodes' historical first-hop interactions by: (1) a neighbor co-occurrence encoding scheme that explores the correlations of the source node and destina…

2022

Dynamic Graph Learning Based on Hierarchical Memory for Origin-Destination Demand Prediction

IJCAI 2022poster

Recent years have witnessed a rapid growth of applying deep spatiotemporal methods in traffic forecasting. However, the prediction of origin-destination (OD) demands is still a challenging problem since the number of OD pairs is usually quadratic to the number of stations. In this case, most of the…

2022

Exploiting Global and Local Hierarchies for Hierarchical Text Classification

EMNLP 2022main

Hierarchical text classification aims to leverage label hierarchy in multi-label text classification. Existing methods encode label hierarchy in a global view, where label hierarchy is treated as the static hierarchical structure containing all labels. Since global hierarchy is static and irrelevant…

2021

Coupled Layer-wise Graph Convolution for Transportation Demand Prediction

AAAI 2021technical

Graph Convolutional Network (GCN) has been widely applied in transportation demand prediction due to its excellent ability to capture non-Euclidean spatial dependence among station-level or regional transportation demands. However, in most of the existing research, the graph convolution was implemen…

2021

LightXML: Transformer with Dynamic Negative Sampling for High-Performance Extreme Multi-label Text Classification

AAAI 2021technical

Extreme multi-label text classification(XMC) is a task for finding the most relevant labels from a large label set. Nowadays deep learning-based methods have shown significant success in XMC. However, the existing methods (e.g., AttentionXML and X-Transformer etc) still suffer from 1) combining seve…