Table 5.

The effect of different strategies on performance.

Strategy	F-Score	$\mathbf{\Delta }$
basic RHCNN + improved focal loss function + information fusion + negative instance filtering	75.48	-
basic RHCNN + improved focal loss function + information fusion	74.32	−1.16
basic RHCNN + improved focal loss function + negative instance filtering	74.39	−1.09
basic RHCNN + cross-entropy loss function + negative instance filtering + information fusion	73.29	−2.19