pluggable backend

[njzjz]

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[codecov]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (6451cdb) 74.93% compared to head (908d748) 75.06%.
Report is 2 commits behind head on devel.

Files	Patch %	Lines
deepmd/backend/backend.py	85.48%	9 Missing ⚠️
deepmd/backend/dpmodel.py	79.31%	6 Missing ⚠️
deepmd/backend/pytorch.py	83.33%	5 Missing ⚠️
deepmd/backend/tensorflow.py	90.32%	3 Missing ⚠️
deepmd/backend/__init__.py	93.33%	1 Missing ⚠️
deepmd/entrypoints/neighbor_stat.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #3294      +/-   ##
==========================================
+ Coverage   74.93%   75.06%   +0.12%     
==========================================
  Files         391      396       +5     
  Lines       33661    33908     +247     
  Branches     1604     1604              
==========================================
+ Hits        25224    25453     +229     
- Misses       7576     7594      +18     
  Partials      861      861              

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