Labels are nodes whose activation modifies the influence of a node on another one.
+------------+ | opposite (3| +------------+ +---------+ | +-----------+ | happy (1|<-------------+-------------->| unhappy (2| +---------+ +-----------+
Let C1 be the occurence number of the word 1 -happy-
Let C12 be the co-occurrences number of the words 1 and 2.
Let A3 be the activation level of word 3 -opposite, the label node-
Let I12 the percentage of influence of the node 1 on the node 2.
I12 = C12/C1 + (1 - C12/C1) x A3