!1681 fix some bugs in mobilenetv2 & vgg16

Merge pull request !1681 from zhaoting/master

official/cv/mobilenetv2/default_config_gpu.yaml

@@ -37,7 +37,7 @@ platform: 'GPU'
 device_id: 0
 rank_id: 0
 rank_size: 1
-run_distribute: True
+run_distribute: False
 activation: "Softmax"
 
 # Image classification trian. train_parse_args():return train_args

official/cv/vgg16/train.py

@@ -221,7 +221,7 @@ def run_train():
 
     # define callbacks
     time_cb = TimeMonitor(data_size=batch_num)
-    loss_cb = LossMonitor(per_print_times=batch_num)
+    loss_cb = LossMonitor()
     callbacks = [time_cb, loss_cb]
     if config.rank_save_ckpt_flag:
         ckpt_config = CheckpointConfig(save_checkpoint_steps=config.ckpt_interval * config.steps_per_epoch,