This function is an internal function used to transform the given list of p (one vector of pathway IDs per gene) groups into a binary matrix.
List of p items. Each item is the vector of Pathway IDs a gene belongs to.
A p x p binary matrix: the coefficient (i,j) is 1 if genes i and j belong to
a common pathway and 0 otherwise. This is an internal function called by for example
Monika Jelizarow and Vincent Guillemot
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