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In this paper, we propose a self-supervised method InfoBehavior to automatically extract meaningful representations from ultra-long raw behavior sequences instead of the costly feature selection procedure ... Thus, we propose a hierarchical grouping strategy to aggregate ultra-long raw behavior sequences to length-processable high-level embedding sequences. ... Therefore, we propose a novel hierarchical grouping strategy to deal with ultra-long sequences. ...arXiv:2106.06905v1 fatcat:qfngohw5vzcp7cawxyhvewp45y