Recent development of Heterogeneous Information Networks From Meta-paths to Meta-graphs Yangqiu song Department of CSE, HKUST, Hong Kong 香港科技大學 THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGYRecent Development of Heterogeneous Information Networks: From Meta-paths to Meta-graphs Yangqiu Song Department of CSE, HKUST, Hong Kong 1