Fix bug

[yuehhua]

No description provided.

[codecov]

Codecov Report

Base: 56.01% // Head: 56.62% // Increases project coverage by +0.60% 🎉

Coverage data is based on head (015edb4) compared to base (518a5ea).
Patch coverage: 90.90% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   56.01%   56.62%   +0.60%     
==========================================
  Files           8        8              
  Lines         216      219       +3     
==========================================
+ Hits          121      124       +3     
  Misses         95       95              

Impacted Files	Coverage Δ
src/preprocess/highly_variable.jl	94.18% <90.90%> (+0.21%)	⬆️

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