* chapter 14 polish half

* chapter 14 soft polish done

* Update bounding-box.md

minor change about the translation

* Update anchor.md

minor update about translation

* Update nadaraya-waston.md

Add the missing Chinese char at the very beginning. i.e. "现".

* Update bert.md

Translation finetuning.

* Update subword-embedding.md

mini fine tune on translation.

* Update bert.md

可学习的片段嵌入 --》根据输入序列学到的片段嵌入

* Update bert-dataset.md

error in bert-dateset section
Co-authored-by: Ngoldmermaid <goldpiggy@berkeley.edu>

* approx-training

* bert-dataset

* bert-pretraining

* bert

* glove

* similarity-analogy

* subword-embedding

* word-embedding-dataset

* index

* word2vec-pretraining

* word2vec

* fix citation, etc

* ch14.5-14.10

* slides

* slides

* slides

* polish

* polish

* add index

* term

* attention chapter

* chapter_natural-language-processing-pretraining

* 令牌 -> 词元