support init_frz_model for hybrid descriptor

[njzjz]

Refactors some methods to implement it.
Also fixes some typos.

[codecov-commenter]

Codecov Report

Merging #1112 (7e48f71) into devel (2a71494) will decrease coverage by 0.14%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##            devel    #1112      +/-   ##
==========================================
- Coverage   75.61%   75.46%   -0.15%     
==========================================
  Files          88       88              
  Lines        7016     7036      +20     
==========================================
+ Hits         5305     5310       +5     
- Misses       1711     1726      +15     

Impacted Files	Coverage Δ
deepmd/model/ener.py	91.74% <0.00%> (-0.85%)	⬇️
deepmd/train/trainer.py	72.01% <0.00%> (ø)
deepmd/model/tensor.py	88.46% <20.00%> (-0.86%)	⬇️
deepmd/descriptor/hybrid.py	36.84% <21.42%> (-3.49%)	⬇️
deepmd/descriptor/descriptor.py	75.00% <33.33%> (-6.49%)	⬇️
deepmd/utils/graph.py	74.11% <42.85%> (ø)
deepmd/descriptor/se_a.py	94.40% <75.00%> (+0.30%)	⬆️

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