Dev textmodel doc2vec

[koheiw]

Address #56

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (e2610f9) to head (178c588).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   96.32%   96.15%   -0.17%     
==========================================
  Files          16       16              
  Lines         870      858      -12     
==========================================
- Hits          838      825      -13     
- Misses         32       33       +1     

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