[Feature] Support CPU demo

[Yshuo-Li]

No description provided.

[codecov]

Codecov Report

Merging #848 (fdbcd22) into master (75d8268) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #848      +/-   ##
==========================================
- Coverage   83.19%   83.11%   -0.08%     
==========================================
  Files         220      220              
  Lines       12441    12452      +11     
  Branches     2012     2017       +5     
==========================================
  Hits        10350    10350              
- Misses       1774     1785      +11     
  Partials      317      317              

Flag	Coverage Δ
unittests	83.07% <0.00%> (-0.08%)	⬇️

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Impacted Files	Coverage Δ
mmedit/apis/generation_inference.py	21.42% <0.00%> (-1.65%)	⬇️
mmedit/apis/inpainting_inference.py	25.00% <0.00%> (-5.77%)	⬇️
mmedit/apis/matting_inference.py	37.20% <0.00%> (-1.82%)	⬇️
mmedit/apis/restoration_face_inference.py	21.27% <0.00%> (-0.95%)	⬇️
mmedit/apis/restoration_inference.py	14.28% <0.00%> (-1.10%)	⬇️

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