Mining the data source from a crowd of people has elicited increasing attention in recent years. In existing studies, multiple users are utilized, in which each user is generally required to annotate only one attribute for each sample. However, there are cases in numerous annotation tasks wherein despite of the presence of multiple users, each user should classify or rate multiple attributes for each sample. This situation is referred to as multi-user multi-attribute annotations in this paper.

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... his work deals with the learning problem under multi-user multi-attribute annotations. A generative model is introduced to describe the human labeling process for multi-user multi-attribute annotations. Subsequently, a maximum likelihood approach is leveraged to infer the parameters in the generative model, namely, groundtruth labels, user expertise, and annotation difficulties. The classifiers for each attribute are also learned simultaneously. Furthermore, the correlations among attributes are taken into account during inference and learning using conditional random field. The experimental results reveal that compared with existing methods that ignore the characteristics of multi-user multi-attribute annotations, our approach can obtain better estimation of the ground truth labels, user experts, annotation difficulties as well as attribute classifiers.