Support crowdhuman dataset for MOT

[GT9505]

No description provided.

[codecov]

Codecov Report

Merging #366 (16efae0) into master (7ee4302) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #366      +/-   ##
==========================================
+ Coverage   69.95%   69.99%   +0.03%     
==========================================
  Files         107      107              
  Lines        5519     5519              
  Branches     1083     1083              
==========================================
+ Hits         3861     3863       +2     
+ Misses       1326     1324       -2     
  Partials      332      332              

Flag	Coverage Δ
unittests	69.92% <ø> (ø)

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Impacted Files	Coverage Δ
mmtrack/datasets/sot_train_dataset.py	81.81% <0.00%> (-4.05%)	⬇️
mmtrack/datasets/pipelines/transforms.py	84.73% <0.00%> (-2.10%)	⬇️
mmtrack/models/trackers/tracktor_tracker.py	79.06% <0.00%> (+15.11%)	⬆️

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