add activation

[hustchaya]

Motivation

add activation to

Modification

Describe the idea and modifications you've done.

Result

Resolved or fixed #.

If there is no issue then describe the changes introduced by this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a0932e7) 82.26% compared to head (1e04e33) 82.28%.
Report is 59 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #334      +/-   ##
============================================
+ Coverage     82.26%   82.28%   +0.01%     
  Complexity      152      152              
============================================
  Files            38       38              
  Lines           919      920       +1     
  Branches         78       78              
============================================
+ Hits            756      757       +1     
  Misses          116      116              
  Partials         47       47              

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[lvjing2]

LGTM