The major difference appears to be the use of MI, and hence we predicted that there would be a close relationship between sim lin and the harmonic mean in the additive MI-based CRM.
this relationship is shown below: Now if tP I(w 1 , c) = tP I(w 2 , c), it follows: when the additive MI-based model is used, γ = 1 and the condition tP I(w 1 , c) = tP I(w 2 , c) holds, the CR framework reduces to sim lin .