An Unsupervised Bayesian Neural Network for Truth Discovery in Social Networks

Abstract

The problem of estimating event truths from conflicting agent opinions in a social network is investigated. An autoencoder learns the complex relationships between event truths, agent reliabilities and agent observations. A Bayesian network model is proposed to guide the learning process by modeling the relationship of the autoencoder's outputs with different variables. At the same time, it also models the social relationships between agents in the network. The proposed approach is unsupervised and is applicable when ground truth labels of events are unavailable. A variational inference method is used to jointly estimate the hidden variables in the Bayesian network and the parameters in the autoencoder. Experiments on three real datasets demonstrate that our proposed approach is competitive with, and in most cases better than, several state-of-the-art benchmark methods.

Finding the Truth From Uncertain Time Series by Differencing

“…This problem has been extensively studied over the years. Truth discovery method can be designed for categorical [10]- [15] or continuous numerical data [9], [16]- [24]. In this section, we only focus on algorithms working for continuous numerical data because time series in real applications are seldom made of categorical data.…”