MNB-FM attempts to improve the noisy estimates θ + w and θ − w utilizing the robust estimate for P (w) computed over unlabeled data.
mNB-Fm proceeds by assuming the mLEs for P (w) (computed over unlabeled data), P t (+), and P t (−) are correct, and reestimates θ + w and θ − w under the constraint in Equation 2.