Example for dp2.x_lmp_gaussian

[ziqi-hu]

An example.

[codecov-commenter]

Codecov Report

Merging #873 (ff3435a) into devel (8dea29e) will increase coverage by 2.88%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel     #873      +/-   ##
==========================================
+ Coverage   35.13%   38.02%   +2.88%     
==========================================
  Files          96       99       +3     
  Lines       16804    17759     +955     
==========================================
+ Hits         5904     6752     +848     
- Misses      10900    11007     +107     

Impacted Files	Coverage Δ
dpgen/generator/lib/make_calypso.py	70.06% <0.00%> (-7.46%)	⬇️
dpgen/generator/run.py	62.50% <0.00%> (-1.18%)	⬇️
dpgen/data/gen.py	47.88% <0.00%> (-0.60%)	⬇️
dpgen/simplify/simplify.py	0.00% <0.00%> (ø)
dpgen/generator/lib/run_calypso.py	10.00% <0.00%> (ø)
dpgen/generator/lib/calypso_run_opt.py	0.00% <0.00%> (ø)
dpgen/generator/lib/calypso_check_outcar.py	0.00% <0.00%> (ø)
dpgen/generator/lib/calypso_run_model_devi.py	0.00% <0.00%> (ø)
dpgen/auto_test/Gamma.py	62.84% <0.00%> (ø)
dpgen/auto_test/ABACUS.py	79.35% <0.00%> (ø)
... and 18 more

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[njzjz]

After #870 and #874 are merged, this PR should follow the same way to check arguments. We don't want to manually review it.