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Graph structured data is pervasive and generated by online human interactions at an unprece- dented velocity. Sophisticated features encoded by relational data, such as structure and relative proximity have unparalleled expressiveness to describe the complex human systems that gen- erated the data. Relational data poses challenges for information extraction and knowledge discovery due to its web scale size, extreme sparsity, multimodality, the presence of spatial autocorrelation anddoi:10.7488/era/1498 fatcat:kmqs4lnzmzam7a7q53aic7nf3y