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Lei Sang

3 accepted papers

2026

CAFU: Constrained Alignment and Filtered Uniformity for Denoising Recommendation

AAAI 2026technical

In recommender systems, recent advances highlight the critical role of alignment and uniformity (AU) in representation learning. Specifically, AU-based methods pull positive user-item pairs closer (alignment) and spread the overall representation distribution (uniformity), typically relying on obser

Cited by 0SourcePDFScholar
2026

Revisiting Contrastive Learning in Collaborative Filtering via Parallel Graph Filters

AAAI 2026technical

Graph Contrastive Learning (GCL) has recently emerged as a powerful paradigm for modeling user–item interactions and learning high-quality representations in recommender systems. While existing GCL-based methods benefit from data augmentation and sampling strategies, they often overlook the inherent

Cited by 0SourcePDFScholar
2025

DICP: Deep In-Context Prompt for Event Causality Identification

EMNLP 2025

Event causality identification (ECI) is a challenging task that involves predicting causal relationships between events in text. Existing prompt-learning-based methods typically concatenate in-context examples only at the input layer, this shallow integration limits the model’s ability to capture th