Fix E722 flake8 warnings (x26).

examples/distillation/distiller.py

@@ -37,7 +37,7 @@ from utils import logger
 
 try:
     from torch.utils.tensorboard import SummaryWriter
-except:
+except ImportError:
     from tensorboardX import SummaryWriter
 
 

examples/distillation/run_squad_w_distillation.py

@@ -67,7 +67,7 @@ from ..utils_squad_evaluate import main as evaluate_on_squad
 
 try:
     from torch.utils.tensorboard import SummaryWriter
-except:
+except ImportError:
     from tensorboardX import SummaryWriter