      return (paddle.io.DataLoader(dataset=mnist_train,
                                   batch_size=batch_size,
                                   shuffle=True,
                                   num_workers=get_dataloader_workers()),
              paddle.io.DataLoader(dataset=mnist_test,
                                   batch_size=batch_size,
                                   return_list=True,
                                   shuffle=True,
 
</s> remove         dataset, batch_size=batch_size, shuffle=True,
 </s> add         dataset, batch_size=batch_size, shuffle=True, return_list=True, </s> remove         shuffle=True, drop_last=True, num_workers=num_workers)
 </s> add         shuffle=True, return_list=True, drop_last=True, num_workers=num_workers) </s> remove         drop_last=True, num_workers=num_workers)
 </s> add         drop_last=True, return_list=True, num_workers=num_workers) </s> remove     train_iter = paddle.io.DataLoader(dataset=train_set, batch_size=batch_size,
 </s> add     train_iter = paddle.io.DataLoader(dataset=train_set, batch_size=batch_size, return_list=True, </s> remove                                            batch_size=batch_size)
 </s> add                                            batch_size=batch_size, return_list=True)
                                 return_list=True,
      return (paddle.io.DataLoader(dataset=mnist_train,
                                   batch_size=batch_size,
                                   shuffle=True,
                                 return_list=True,
                                   num_workers=get_dataloader_workers()),
              paddle.io.DataLoader(dataset=mnist_test,
                                   batch_size=batch_size,
                                   return_list=True,
                                   shuffle=True,
keep keep add keep keep keep keep keep
 [PaddlePaddle]Remove multi gpu training (#1205)

* Remove multi gpu training

* Try to Add return list for avoiding runtime error

* Set num_workers to 0

* Remove numbers of fcn.md

* Fix natural-language-inference-attention.md&bert-pretraining.md 
d2l/paddle.py