Fluid new API not working for fit_a_line in book

[daming-lu]

https://github.com/PaddlePaddle/Paddle/pull/10301/files

As of now, trainer.train() has been implemented. So I tried to train fit_a_line using the new API and infer using the old one in the hope that the old and the new are compatible. But I got the error like below:

Even after I changed the reader from

train_reader = paddle.batch( paddle.reader.shuffle( paddle.dataset.uci_housing.train(), buf_size=500), batch_size=BATCH_SIZE)

to

train_reader = paddle.reader.shuffle( paddle.dataset.uci_housing.train(), buf_size=500)

it still did not work. Any hint? Thanks 😀

[daming-lu]

feed_order is required now.