[DOC]Add api docs and prettify tutorials

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Description

(Brief description on what this PR is about)

What does this implement/fix? Explain your changes.

Add flow chart.
Add api docs and prettify tutorials.

Pull request type

• [DATASET] Add a new dataset
• [BUGFIX] Bugfix
• [FEATURE] New feature (non-breaking change which adds functionality)
• [BREAKING] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [STYLE] Code style update (formatting, renaming)
• [REFACTOR] Refactoring (no functional changes, no api changes)
• [BUILD] Build related changes
• [DOC] Documentation content changes
• [OTHER] Other (please describe):

Changes

1. Update EduNLP/Formula/Formula.py
2. Update EduNLP/Formula/ast/ast.py
3. Update EduNLP/Formula/viz/init.py
4. Update EduNLP/I2V/i2v.py
5. Update EduNLP/ModelZoo/rnn/rnn.py
6. Update EduNLP/ModelZoo/utils/masker.py
7. Update EduNLP/ModelZoo/utils/padder.py
8. Update EduNLP/Pretrain/gensim_vec.py
9. Update EduNLP/SIF/parser/parser.py
10. Update EduNLP/SIF/segment/segment.py
11. Update EduNLP/SIF/sif.py
12. Update EduNLP/SIF/tokenization/formula/linear_token.py
13. Update EduNLP/SIF/tokenization/tokenization.py
14. Update EduNLP/Tokenizer/tokenizer.py
15. Update EduNLP/Vector/t2v.py
16. Update docs/source/_static/formula.png
17. Update docs/source/_static/formulagroup.png
18. Update docs/source/api/ModelZoo.rst
19. Update docs/source/api/formula.rst
20. Update docs/source/api/i2v.rst
21. Update docs/source/api/sif.rst
22. Update docs/source/api/vector.rst
23. Update docs/source/conf.py
24. Update docs/source/index.rst
25. Update docs/source/tutorial/zh/index.rst
26. Update docs/source/tutorial/zh/parse.rst
27. Update docs/source/tutorial/zh/parse/公式语法结构解析.rst
28. Update docs/source/tutorial/zh/parse/文本语法结构解析.rst
29. Update docs/source/tutorial/zh/pretrain.rst
30. Update docs/source/tutorial/zh/seg.rst
31. Update docs/source/tutorial/zh/seg/结构成分分解.rst
32. Update docs/source/tutorial/zh/seg/语义成分分解.rst
33. Update docs/source/tutorial/zh/sif.rst
34. Update docs/source/tutorial/zh/tokenization/PureTextTokenizer.rst
35. Update docs/source/tutorial/zh/tokenize.rst
36. Update docs/source/tutorial/zh/vectorization.rst
37. Update docs/source/tutorial/zh/vectorization/不使用预训练模型.rst
38. Update examples/Tokenizer/test_stopwords.txt
39. Update examples/Tokenizer/tokenizer.ipynb
40. Update examples/formula/formula.ipynb
41. Update examples/i2v/get_pretrained_i2v.ipynb
42. Update examples/i2v/i2v.ipynb
43. Update examples/sif/sif.ipynb
44. Update examples/sif/sif4sci.ipynb
45. Update examples/t2v/get_pretrained_t2v.ipynb
46. Update examples/t2v/t2v.ipynb
47. Update examples/test_model/data/d2v/test_256.zip
48. Update examples/test_model/data/d2v/test_256/test_256.bin
49. Update examples/test_model/data/w2v/test_w2v_256.zip
50. Update examples/test_model/data/w2v/test_w2v_256/test_w2v_256.kv
51. Update examples/utils/data.ipynb
52. Update Update docs/source/_static/流程图.jpg

Does this close any currently open issues?

#69
#71

Any relevant logs, error output, etc?

N/A

Checklist

Before you submit a pull request, please make sure you have to following:

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [FEATURE], [BREAKING], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage and al tests passing
• Code is well-documented (extended the README / documentation, if necessary)
• If this PR is your first one, add your name and github account to AUTHORS.md

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here