fix: update trainer and tuner

[LongxingTan]

Description

This PR ...

Checklist

• Linked issues (if existing)
• Amended changelog.md for large changes (and added myself there as contributor)
• Added/modified tests
• Used pre-commit hooks when committing to ensure that code is compliant with hooks. Install hooks with pre-commit install.
  To run hooks independent of commit, execute pre-commit run --all-files

Thank you for joining. Have fun coding!

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (f3ae2ef) 88.82% compared to head (ecbe059) 88.97%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   88.82%   88.97%   +0.15%     
==========================================
  Files          27       27              
  Lines        2130     2132       +2     
==========================================
+ Hits         1892     1897       +5     
+ Misses        238      235       -3     

Flag	Coverage Δ
cpu	88.97% <87.50%> (+0.15%)	⬆️
unittest	88.97% <87.50%> (+0.15%)	⬆️

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Files	Coverage Δ
tfts/trainer.py	83.95% <100.00%> (+0.08%)	⬆️
tfts/tuner.py	92.30% <80.00%> (+0.64%)	⬆️

... and 1 file with indirect coverage changes

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