From the result of Equation (13), we have: If Y (i) > 0; then topic T i is present; otherwise T i is not present in document x The use of Equation (13) implies that: a) If a LPN is not activated, i.e., y (i) ≤ θ (i) , then its output is not used in the GE.
it will not affect the output of other LPN.