Do not return document vector from word2vec

[koheiw]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.27%. Comparing base (3347051) to head (4a81483).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
+ Coverage   96.15%   96.27%   +0.11%     
==========================================
  Files          16       16              
  Lines         858      858              
==========================================
+ Hits          825      826       +1     
+ Misses         33       32       -1     

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