  Knowledge bases are prevalent in various domains and have been widely used in
a large number of real applications such as applications in online
encyclopedia, social media, biomedical fields, bibliographical networks. Due to
their great importance, knowledge bases have received much attention from both
the academia and industry community in recent years. In this paper, we provide
a summary of the general statistics of several open-source and publicly
accessible knowledge bases, ranging from the number of objects, relations to
the object types and the relation types. With such statistics, this concise
note can not only help researchers form a better and quick understanding of
existing open accessible knowledge bases, but can also guide the general
audience to use the resource effectively when they conduct research with
knowledge bases.
