!11939 Modify cnnctc network save checkpoint

From: @zhanghuiyao
Reviewed-by: @linqingke,@liangchenghui
Signed-off-by: @linqingke

model_zoo/official/cv/cnnctc/train.py

@@ -80,10 +80,13 @@ def train(args_opt, config):
                                  keep_checkpoint_max=config.KEEP_CKPT_MAX_NUM)
     ckpoint_cb = ModelCheckpoint(prefix="CNNCTC", config=config_ck, directory=config.SAVE_PATH)
 
+    if args_opt.run_distribute:
         if args_opt.device_id == 0:
             model.train(config.TRAIN_EPOCHS, ds, callbacks=[callback, ckpoint_cb], dataset_sink_mode=False)
         else:
             model.train(config.TRAIN_EPOCHS, ds, callbacks=[callback], dataset_sink_mode=False)
+    else:
+        model.train(config.TRAIN_EPOCHS, ds, callbacks=[callback, ckpoint_cb], dataset_sink_mode=False)
 
 
 if __name__ == '__main__':