fix readthedoc

[cuhk-hbsun]

No description provided.

[codecov]

Codecov Report

Merging #247 (0ef432f) into main (ef44026) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #247   +/-   ##
=======================================
  Coverage   85.96%   85.96%           
=======================================
  Files         132      132           
  Lines        8793     8793           
  Branches     1229     1229           
=======================================
  Hits         7559     7559           
  Misses        933      933           
  Partials      301      301           

Flag	Coverage Δ
unittests	85.96% <ø> (ø)

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