fix(example): anomaly detection

[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: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 87.32%. Comparing base (6852412) to head (f589f41).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tfts/models/auto_model.py	50.00%	2 Missing ⚠️
tfts/tasks/auto_task.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   86.10%   87.32%   +1.22%     
==========================================
  Files          33       32       -1     
  Lines        2598     2541      -57     
==========================================
- Hits         2237     2219      -18     
+ Misses        361      322      -39     

Flag	Coverage Δ
cpu	87.32% <75.00%> (+1.22%)	⬆️
unittest	87.32% <75.00%> (+1.22%)	⬆️

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