← Search

Sanshi Lei Yu

2 accepted papers

2023

AdaptSSR: Pre-training User Model with Augmentation-Adaptive Self-Supervised Ranking

NeurIPS 2023poster

User modeling, which aims to capture users' characteristics or interests, heavily relies on task-specific labeled data and suffers from the data sparsity issue. Several recent studies tackled this problem by pre-training the user model on massive user behavior sequences with a contrastive learning t…

2023

Untargeted Attack against Federated Recommendation Systems via Poisonous Item Embeddings and the Defense

AAAI 2023technical

Federated recommendation (FedRec) can train personalized recommenders without collecting user data, but the decentralized nature makes it susceptible to poisoning attacks. Most previous studies focus on the targeted attack to promote certain items, while the untargeted attack that aims to degrade th…