fix typo (#1667)

Author: tkhe

mmseg/models/losses/dice_loss.py

@@ -35,7 +35,7 @@ def dice_loss(pred,
 
 
 @weighted_loss
-def binary_dice_loss(pred, target, valid_mask, smooth=1, exponent=2, **kwards):
+def binary_dice_loss(pred, target, valid_mask, smooth=1, exponent=2, **kwargs):
     assert pred.shape[0] == target.shape[0]
     pred = pred.reshape(pred.shape[0], -1)
     target = target.reshape(target.shape[0], -1)
@@ -79,7 +79,7 @@ def __init__(self,
                  loss_weight=1.0,
                  ignore_index=255,
                  loss_name='loss_dice',
-                 **kwards):
+                 **kwargs):
         super(DiceLoss, self).__init__()
         self.smooth = smooth
         self.exponent = exponent
@@ -94,7 +94,7 @@ def forward(self,
                 target,
                 avg_factor=None,
                 reduction_override=None,
-                **kwards):
+                **kwargs):
         assert reduction_override in (None, 'none', 'mean', 'sum')
         reduction = (
             reduction_override if reduction_override else self.reduction)