Use np.random instead of random

[innerlee]

Increase consistency

[codecov]

Codecov Report

Merging #213 (4fde769) into master (48e39a9) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
- Coverage   82.28%   82.27%   -0.01%     
==========================================
  Files         145      145              
  Lines        6699     6697       -2     
  Branches      998      998              
==========================================
- Hits         5512     5510       -2     
  Misses       1083     1083              
  Partials      104      104              

Flag	Coverage Δ
unittests	82.27% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmedit/datasets/pipelines/augmentation.py	99.16% <100.00%> (-0.01%)	⬇️
mmedit/datasets/pipelines/crop.py	96.81% <100.00%> (-0.02%)	⬇️

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