  A doubly nonnegative matrix can be written as a Gramian matrix, and a
completely positive matrix can therefore be written as a Gramian matrix of some
nonnegative vectors. In this paper, we introduce Gramian tensors and study
2-dimension completely positive tensors and {0,1} CP tensors. Also investigated
are the complete positive multi-hypergraph, a generalized form of a cp graph.
We also provide a necessary and sufficient condition for a 2-dimensional tensor
to be completely positive.
