[Bug Fix] Add missing transforms in __init__.py

[xvjiarui]

Fixed #253

[codecov]

Codecov Report

Merging #260 (d411e70) into master (61e1d5c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #260   +/-   ##
=======================================
  Coverage   84.45%   84.45%           
=======================================
  Files          90       90           
  Lines        4368     4368           
  Branches      689      689           
=======================================
  Hits         3689     3689           
  Misses        538      538           
  Partials      141      141           

Flag	Coverage Δ
unittests	84.45% <ø> (ø)

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Impacted Files	Coverage Δ
mmseg/datasets/pipelines/__init__.py	100.00% <ø> (ø)

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