support mixed numbers of atoms with mixed_type

[njzjz]

Support virtual atom types (-1) for se_atten. Thus, mixed numbers of atoms can be input for inference with mixed_type.

[codecov-commenter]

Codecov Report

Base: 74.75% // Head: 74.80% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (595c10d) compared to base (595bddf).
Patch coverage: 70.58% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2345      +/-   ##
==========================================
+ Coverage   74.75%   74.80%   +0.04%     
==========================================
  Files         223      223              
  Lines       22265    22282      +17     
  Branches     1627     1618       -9     
==========================================
+ Hits        16645    16667      +22     
+ Misses       4567     4556      -11     
- Partials     1053     1059       +6     

Impacted Files	Coverage Δ
source/lib/include/neighbor_list.h	100.00% <ø> (ø)
source/lib/src/fmt_nlist.cc	78.31% <0.00%> (-3.40%)	⬇️
source/op/prod_env_mat_multi_device.cc	93.09% <33.33%> (+0.03%)	⬆️
source/lib/src/prod_env_mat.cc	70.58% <75.00%> (-1.02%)	⬇️
deepmd/descriptor/se_atten.py	94.80% <100.00%> (+0.01%)	⬆️
deepmd/fit/ener.py	89.45% <100.00%> (+0.09%)	⬆️
source/op/quantize_nvnmd.cc	70.21% <0.00%> (ø)
source/lib/include/ComputeDescriptor.h	79.32% <0.00%> (ø)
deepmd/utils/data.py	93.72% <0.00%> (+0.10%)	⬆️
... and 2 more

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