save model proto as file

update word2vec to be compatible with book ipynb

Fix rename mse_cost

rename mse into square_error after dev branch update.

fix 02.recognize_digits notebook error

Modify doc to point the lastest docker images

add inference to 01

Make same model examples no longer compress model.

Compressing the model dramatically slows down model read and write
with a little benefit: model compression ratio is very low.

add video link

Refine Chapter 8 WMT.

Fix typo in understand_sentiment

Fix 03.image_classification typo

fix build script, English link and dead link

update the machine translation demo to adapt to update in PaddlePaddle.

Revise book docker image version

the resnet.py is inconsistent with the standard model. modify the basic…