Fix single-task training&data stat

[iProzd]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 75.80%. Comparing base (897fcc5) to head (7f573ab).

Files	Patch %	Lines
deepmd/pt/model/model/model.py	50.00%	1 Missing ⚠️
deepmd/utils/path.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #3355      +/-   ##
==========================================
- Coverage   75.83%   75.80%   -0.04%     
==========================================
  Files         415      415              
  Lines       34862    34863       +1     
  Branches     1614     1614              
==========================================
- Hits        26437    26427      -10     
- Misses       7557     7568      +11     
  Partials      868      868              

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