update stat to classify papers

[congee524]

[codecov]

Codecov Report

Merging #182 (1fd2173) into master (4e5fa7b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #182   +/-   ##
=======================================
  Coverage   82.21%   82.21%           
=======================================
  Files         145      145           
  Lines        6721     6721           
  Branches      997      997           
=======================================
  Hits         5526     5526           
  Misses       1092     1092           
  Partials      103      103           

Flag	Coverage Δ
unittests	82.21% <ø> (ø)

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