fix float32 support

[kunyuan]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.38%. Comparing base (6182ab1) to head (17c5286).

Files with missing lines	Patch %	Lines
src/maps.py	80.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #24   +/-   ##
=======================================
  Coverage   96.37%   96.38%           
=======================================
  Files          11       11           
  Lines        1214     1217    +3     
=======================================
+ Hits         1170     1173    +3     
  Misses         44       44           

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