Update pypolymlp feature

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[codecov]

Codecov Report

Attention: Patch coverage is 31.95266% with 115 lines in your changes missing coverage. Please review.

Project coverage is 64.50%. Comparing base (ce96f84) to head (20a4021).
Report is 14 commits behind head on develop.

❗ Current head 20a4021 differs from pull request most recent head 3d49320

Please upload reports for the commit 3d49320 to get more accurate results.

Files	Patch %	Lines
phono3py/api_phono3py.py	15.87%	53 Missing ⚠️
phono3py/cui/create_force_constants.py	20.00%	32 Missing ⚠️
phono3py/cui/load.py	60.71%	22 Missing ⚠️
test/api/test_api_phono3py.py	20.00%	4 Missing ⚠️
phono3py/cui/phono3py_argparse.py	0.00%	3 Missing ⚠️
phono3py/cui/show_log.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #242      +/-   ##
===========================================
- Coverage    66.34%   64.50%   -1.84%     
===========================================
  Files           72       72              
  Lines        12638    12752     +114     
===========================================
- Hits          8385     8226     -159     
- Misses        4253     4526     +273     

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