This reverts commit ced55106.

1.scale-尺度拉伸吧
2.多了个空格

* Optimize description

* Optimize description in conv-layer.md

* update comment in linear-regression-scratch.md

* restored the period at the end of the code comment

* revert changes about period

* revert changes about period in conv-layer.md

* revert changes about code block in linear-regression-scratch.md

* Add the difference between training and predicting under Autograd

* fix training and predicting

* fix typo in conv-layer.md

* fix typo in padding-and-strides.md

* fix typo in channels.md

* fix typo in deferred-init.md

* fix typo in lenet.md

* fix typo in alexnet.md

* fix typo in vgg.md

* fix typo in nin.md

* fix typo in batch-norm.md

* fix typo in resnet.md

* add librsvg2-bin in readme

* improve kaggle dog tutorial

* fix

* improve

* improve

* improve

* update data aug

* add fix to utils for new transform

* fix

* improve comments

* improve writing

* improve comments