chore(bert): bert final result

[shenxiangzhuang]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the BERT model documentation to reflect final training results, including improved performance metrics and training visualization.

• Updated training epochs from 14 to 23
• Improved performance metrics (perplexity decreased from 6.62 to 5.90, SST2 accuracy increased from 90.77% to 91.93%)
• Added training curve visualization with reference to loss plot image

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.42%. Comparing base (771e1af) to head (05efe78).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #48   +/-   ##
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  Coverage   94.42%   94.42%           
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  Files           9        9           
  Lines         520      520           
=======================================
  Hits          491      491           
  Misses         29       29           

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