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Abstract:
Recently, recommender system suffers extremely from both interaction bias and sparsity. The conventional unified embedding learning policies fail to consider the imbalanced interaction issue and produce suboptimal representations of users and items for recommendation. Towards the end, this work dedicates to bias-aware embedding learning in a decomposed manner and proposes a Counterfactual Embedding Learning (CEL) for debiased recommendation. Instead of debiasing with sampling uniform interactions, we follow and capitalize the natural bias distribution to model users and items with a counterfactual hypothesis. Concretely, embeddings of users and items are built with common and special causes to model latent frequent and infrequent bias isometrically. Particularly, relying on the frequency gap between common and special causes, CEL introduces a bias-aware counterfactual masking on interactions and forms multiple counterfactual worlds to extract effects of various special causes comparing with the factual world. Experiments show that the proposed CEL performs superior to state-of-the-art baselines.
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Source :
2021 IEEE SEVENTH INTERNATIONAL CONFERENCE ON MULTIMEDIA BIG DATA (BIGMM 2021)
Year: 2021
Page: 69-73
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count:
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 13
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