There are two kinds of noises: those from WSP of the correct sense, and those from WSP of the wrong sense(s).
suppose we have an assertion <c, relation, d>, where concept c is ambiguous and has two senses Then the first kind of noises are from WsP( 1 n c ), which do not have close relation to d. their NGD scores should be high, though they have a WordNet relation to 1 n c .