change directory name vdllog to visualization

paddlehub/finetune/task/basic_task.py

@@ -140,7 +140,7 @@ class BasicTask(object):
         # log item
         if not os.path.exists(self.config.checkpoint_dir):
             mkdir(self.config.checkpoint_dir)
-        vdl_log_dir = os.path.join(self.config.checkpoint_dir, "vdllog")
+        vdl_log_dir = os.path.join(self.config.checkpoint_dir, "visualization")
         self.tb_writer = SummaryWriter(vdl_log_dir)
 
         # run environment