Add kernel mean descriptor for composition

[TsumiNa]

No description provided.

[codecov]

Codecov Report

Merging #237 (186b23f) into master (a8d1753) will decrease coverage by 0.16%.
The diff coverage is 19.27%.

❗ Current head 186b23f differs from pull request most recent head 534f7ca. Consider uploading reports for the commit 534f7ca to get more accurate results

@@            Coverage Diff             @@
##           master     #237      +/-   ##
==========================================
- Coverage   35.10%   34.94%   -0.17%     
==========================================
  Files          96       96              
  Lines        7195     7197       +2     
==========================================
- Hits         2526     2515      -11     
- Misses       4669     4682      +13     

Impacted Files	Coverage Δ
xenonpy/descriptor/__init__.py	0.00% <0.00%> (ø)
xenonpy/descriptor/compositions.py	0.00% <0.00%> (ø)
xenonpy/descriptor/kernel.py	0.00% <0.00%> (ø)
tests/descriptor/test_compositional.py	98.38% <100.00%> (ø)
tests/utils/test_parameter_gen.py	97.43% <0.00%> (-1.29%)	⬇️
tests/inverse/test_base_inverse.py	97.67% <0.00%> (-1.17%)	⬇️
tests/datatools/test_splitter.py	98.80% <0.00%> (-0.60%)	⬇️
tests/models/test_trainer.py	99.24% <0.00%> (-0.04%)	⬇️
setup.py	0.00% <0.00%> (ø)
xenonpy/descriptor/base.py	0.00% <0.00%> (ø)
... and 15 more

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