N-Gram Graph: Simple Unsupervised Representation
  for Graphs, with Applications to Molecules

          Shengchao Liu, Mehmet Furkan Demirel, Yingyu Liang
    Department of Computer Sciences, University of Wisconsin-Madison, Madison, WI
             {shengchao, demirel, yliang}@cs.wisc.edu

                       Abstract
     Machine learning techniques have recently been adopted in various applications
     in medicine, biology, chemistry, and material engineering. An important task is
     t ...