[DOC]Update documents

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Description

(Brief description on what this PR is about)

What does this implement/fix? Explain your changes.

1. Update d2v.png
2. Update d2v_bow_tfidf.png
3. Update d2v_general.png
4. Update d2v_stem_tf.png
5. Update sif.png
6. Update w2v_stem_text.png
7. Update w2v_stem_tf.png
8. Update conf.py
9. Update index.rst
10. Update parse.rst
11. Update pretrain.rst
12. Update loading.rst
13. Update pub.rst
14. Update start.rst
15. Update seg.rst
16. Update sif.rst
17. Update tokenize.rst
18. Update 令牌化.rst
19. Update 分句.rst
20. Update 分词.rst
21. Update vectorization.rst
22. Update 不使用预训练模型.rst
23. Update 使用预训练模型.rst

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 d2v.png
2. Update d2v_bow_tfidf.png
3. Update d2v_general.png
4. Update d2v_stem_tf.png
5. Update sif.png
6. Update w2v_stem_text.png
7. Update w2v_stem_tf.png
8. Update conf.py
9. Update index.rst
10. Update parse.rst
11. Update pretrain.rst
12. Update loading.rst
13. Update pub.rst
14. Update start.rst
15. Update seg.rst
16. Update sif.rst
17. Update tokenize.rst
18. Update 令牌化.rst
19. Update 分句.rst
20. Update 分词.rst
21. Update vectorization.rst
22. Update 不使用预训练模型.rst
23. Update 使用预训练模型.rst

Does this close any currently open issues?

N/A

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 #47 (958a0e2) into docs_dev (92afc44) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           docs_dev      #47   +/-   ##
=========================================
  Coverage     99.85%   99.85%           
=========================================
  Files            46       46           
  Lines          1338     1338           
=========================================
  Hits           1336     1336           
  Misses            2        2           

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