### 这一篇博文待一个月后，我对 EM 算法的理解更加深刻后再来补上。
1. Online Crowdsourcing : rating annotators and obtaining cost-effective labels. (CVPR_workshop2010)
Bayesian treatment of Expectation Maximizatio algorithm
2.Whose Vote Should count more: Optimal Integration of labels from labelers of unknown expertise (NIPS09)