We define the confidence value of transferring the value of m i to m j as follows: where | • | denotes the cardinality of the enclosed set.
for each document m j ∈ M te , we consider each document m i ∈ M tr , compute the corresponding confidence V C (m i → m j ), and then transfer the V al value of The denominator of Equation 4 is the number of posts in M tr for which the transfer confidence to m j is non-zero.