fix a typo in #1118

[njzjz]

This fixes a typo in #1118.

[codecov-commenter]

Codecov Report

Merging #1142 (7ba0555) into devel (76bc05c) will decrease coverage by 11.37%.
The diff coverage is n/a.

❗ Current head 7ba0555 differs from pull request most recent head 5048ace. Consider uploading reports for the commit 5048ace to get more accurate results

@@             Coverage Diff             @@
##            devel    #1142       +/-   ##
===========================================
- Coverage   75.66%   64.28%   -11.38%     
===========================================
  Files          88        5       -83     
  Lines        7034       14     -7020     
===========================================
- Hits         5322        9     -5313     
+ Misses       1712        5     -1707     

Impacted Files	Coverage Δ
deepmd/entrypoints/doc.py
source/op/_gelu.py
deepmd/fit/__init__.py
deepmd/env.py
source/op/_tabulate_grad.py
deepmd/cluster/__init__.py
deepmd/descriptor/loc_frame.py
source/op/_prod_virial_grad.py
deepmd/utils/data_system.py
deepmd/descriptor/hybrid.py
... and 72 more

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