Table 1: Basic settings of synthetic data generation algorithm.

TypeSymbolDescription

Unlabeled usersEach unlabeled user randomly picks 1 to apps as targets, with probability to operate the th app in app partite.
Fraud users Each fraud user randomly picks 1 to apps as targets, with probability to operate fraud app. Particularly, and .
Normal apps The normal label is randomly assigned.
Fraud apps The fraud label is randomly assigned.