Sim_GraSM_2005
Sim_GraSM_2005(dag, terms)The IC method is fixed to IC_annotation.
It applies a complicate way to selet a subset of common ancestors of terms a and b. The main idea is that content transmission fron ancestors to a term
may overlap and it aims to find upstream paths that give exclusive transmissions.
First, for a terms x define its disjunctive ancestors (DA) pairs a and b where there exists a path from a to x which does not pass b, and at the same
time there exists a path frmo b to x which does not pass a. In other words, the directed distance between a and b is zero. In this way, the two
DA(x) terms can transmit exclusive contents to x.
Next, for every common ancestor c of term a and b, c is only selected if there is another common ancestor c' which have smaller IC than c (IC(c) > IC(c')), (c, c') is DA of
either a or b.
Then the mean IC of the subset common ancestors is calculated and normalized by the Lin_1998 method.
Paper link: doi:10.1145/1099554.1099658 .