!3969 modify psenet scripts

Merge pull request !3969 from anzhengqi/modify-networks

official/cv/psenet/src/PSENET/dice_loss.py

@@ -87,7 +87,7 @@ class DiceLoss(Cell):
         neg_num = self.minimum(3 * pos_num, neg_num)
         neg_num = self.cast(neg_num, mstype.int32)
 
-        neg_num = self.add(neg_num, self.negative_one_int32)
+        neg_num = neg_num + self.k - 1
         neg_mask = self.less_equal(gt_text, self.threshold0)
         ignore_score = self.fill(mstype.float32, (640, 640), -1e3)
         neg_score = self.select(neg_mask, score, ignore_score)