only save ckpt in rank0 for Transformer

model_zoo/Transformer/train.py

@@ -147,6 +147,7 @@ def run_transformer_train():
 
     callbacks = [TimeMonitor(dataset.get_dataset_size()), LossCallBack()]
     if args.enable_save_ckpt == "true":
+        if device_num == 1 or (device_num > 1 and rank_id == 0):
             ckpt_config = CheckpointConfig(save_checkpoint_steps=args.save_checkpoint_steps,
                                            keep_checkpoint_max=args.save_checkpoint_num)
             ckpoint_cb = ModelCheckpoint(prefix='transformer', directory=args.save_checkpoint_path, config=ckpt_config)