Se atten grad grad

[nahso]

fix #2865

[codecov]

Codecov Report

Attention: 44 lines in your changes are missing coverage. Please review.

Comparison is base (f256dff) 75.46% compared to head (786fb14) 75.73%.
Report is 3 commits behind head on devel.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2898      +/-   ##
==========================================
+ Coverage   75.46%   75.73%   +0.27%     
==========================================
  Files         244      245       +1     
  Lines       24522    24918     +396     
  Branches     1580     1617      +37     
==========================================
+ Hits        18505    18872     +367     
+ Misses       5086     5082       -4     
- Partials      931      964      +33     

Files	Coverage Δ
deepmd/op/_tabulate_grad.py	100.00% <100.00%> (ø)
source/lib/src/tabulate.cc	58.03% <0.00%> (-0.53%)	⬇️
source/op/tabulate_multi_device.cc	54.82% <0.00%> (-5.24%)	⬇️

... and 16 files with indirect coverage changes

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[njzjz]

Let's rerun Test CUDA after #2892 is merged.

[njzjz]

It looks good to me. It's still unclear to me how the equation is derivated, though...