fix(demo): fix celeba example docs, logic, code

[hanxiao]

No description provided.

[codecov]

Codecov Report

Merging #145 (a587e86) into main (b0da1bf) will increase coverage by 0.22%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   85.27%   85.49%   +0.22%     
==========================================
  Files          24       26       +2     
  Lines        1161     1310     +149     
==========================================
+ Hits          990     1120     +130     
- Misses        171      190      +19     

Flag	Coverage Δ
finetuner	85.49% <0.00%> (+0.22%)	⬆️

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Impacted Files	Coverage Δ
finetuner/labeler/executor.py	0.00% <0.00%> (ø)
finetuner/toydata.py	95.85% <0.00%> (-0.51%)	⬇️
finetuner/labeler/__init__.py	0.00% <0.00%> (ø)
finetuner/tuner/dataset/__init__.py	100.00% <0.00%> (ø)
finetuner/tuner/evaluation.py	100.00% <0.00%> (ø)
finetuner/tuner/stats.py	100.00% <0.00%> (ø)
finetuner/tuner/paddle/__init__.py	95.29% <0.00%> (+0.42%)	⬆️
finetuner/tuner/keras/__init__.py	94.44% <0.00%> (+0.54%)	⬆️
finetuner/tuner/pytorch/__init__.py	94.56% <0.00%> (+0.58%)	⬆️
... and 2 more

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