[DOC]Update documents

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Description

(Brief description on what this PR is about)

What does this implement/fix? Explain your changes.

New flow chart.
Prettify decuments.

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/ModelZoo/rnn/rnn.py
3. Update EduNLP/ModelZoo/utils/masker.py
4. Update EduNLP/ModelZoo/utils/padder.py
5. Update EduNLP/Pretrain/gensim_vec.py
6. Update EduNLP/SIF/segment/segment.py
7. Update EduNLP/SIF/sif.py
8. Update EduNLP/SIF/tokenization/formula/linear_token.py
9. Update EduNLP/SIF/tokenization/tokenization.py
10. Update EduNLP/Vector/gensim_vec.py
11. Update docs/source/_static/新流程图.png
12. Update docs/source/_static/流程图.jpg
13. Update docs/source/api/sif.rst
14. Update docs/source/index.rst
15. Update docs/source/tutorial/zh/index.rst
16. Update EduNLP/SIF/tokenization/tokenization.py
17. Update EduNLP/SIF/parser/parser.py
18. Update EduNLP/I2V/i2v.py
19. Update EduNLP/SIF/segment/segment.py
20. Update EduNLP/SIF/tokenization/formula/ast_token.py

Does this close any currently open issues?

#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

[codecov-commenter]

Codecov Report

Merging #91 (4fc89ba) into docs (2c61156) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              docs       #91   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           46        46           
  Lines         1365      1365           
=========================================
  Hits          1365      1365           

Impacted Files	Coverage Δ
EduNLP/Formula/Formula.py	100.00% <ø> (ø)
EduNLP/I2V/i2v.py	100.00% <ø> (ø)
EduNLP/ModelZoo/rnn/rnn.py	100.00% <ø> (ø)
EduNLP/ModelZoo/utils/masker.py	100.00% <ø> (ø)
EduNLP/ModelZoo/utils/padder.py	100.00% <ø> (ø)
EduNLP/Pretrain/gensim_vec.py	100.00% <ø> (ø)
EduNLP/SIF/parser/parser.py	100.00% <ø> (ø)
EduNLP/SIF/segment/segment.py	100.00% <ø> (ø)
EduNLP/SIF/sif.py	100.00% <ø> (ø)
EduNLP/SIF/tokenization/formula/ast_token.py	100.00% <ø> (ø)
... and 5 more

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