Doc: Update PT tensor fitting

[anyangml]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.58%. Comparing base (d2b18b2) to head (be183f1).

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #3385   +/-   ##
=======================================
  Coverage   76.58%   76.58%           
=======================================
  Files         420      420           
  Lines       35705    35705           
  Branches     1620     1620           
=======================================
  Hits        27345    27345           
  Misses       7492     7492           
  Partials      868      868           

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[njzjz]

Need to update: https://deepmodeling--3385.org.readthedocs.build/projects/deepmd/en/3385/model/dprc.html
https://deepmodeling--3385.org.readthedocs.build/projects/deepmd/en/3385/model/train-energy.html

[anyangml]

Need to update: https://deepmodeling--3385.org.readthedocs.build/projects/deepmd/en/3385/model/dprc.html https://deepmodeling--3385.org.readthedocs.build/projects/deepmd/en/3385/model/train-energy.html

what need to be updated here?