add start_pref_pf and limit_pref_pf to loss Argument

[njzjz]

fix #1199.

[codecov-commenter]

Codecov Report

Merging #1200 (3d2da57) into devel (d8acbb8) will decrease coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            devel    #1200      +/-   ##
==========================================
- Coverage   76.06%   75.97%   -0.10%     
==========================================
  Files          91       91              
  Lines        7241     7238       -3     
==========================================
- Hits         5508     5499       -9     
- Misses       1733     1739       +6     

Impacted Files	Coverage Δ
deepmd/utils/argcheck.py	89.86% <100.00%> (-0.14%)	⬇️
source/op/_gelu.py	71.42% <0.00%> (-6.35%)	⬇️
deepmd/infer/deep_eval.py	92.45% <0.00%> (-4.43%)	⬇️
deepmd/entrypoints/test.py	11.53% <0.00%> (-0.37%)	⬇️
deepmd/loss/ener.py	47.34% <0.00%> (-0.24%)	⬇️
deepmd/train/trainer.py	73.76% <0.00%> (-0.13%)	⬇️
deepmd/train/run_options.py	86.66% <0.00%> (-0.13%)	⬇️
source/op/_tabulate_grad.py	100.00% <0.00%> (ø)
source/op/_prod_force_grad.py	100.00% <0.00%> (ø)
... and 9 more

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[Franklalalala]

Wow, so efficient! Thanks a lot!