Fix unittest

[jin-s13]

No description provided.

[codecov]

Codecov Report

Merging #529 (70d08af) into master (0bd81c8) will increase coverage by 0.04%.
The diff coverage is n/a.

❗ Current head 70d08af differs from pull request most recent head a20fa80. Consider uploading reports for the commit a20fa80 to get more accurate results

@@            Coverage Diff             @@
##           master     #529      +/-   ##
==========================================
+ Coverage   81.16%   81.20%   +0.04%     
==========================================
  Files         139      139              
  Lines        9572     9572              
  Branches     1530     1530              
==========================================
+ Hits         7769     7773       +4     
+ Misses       1458     1455       -3     
+ Partials      345      344       -1     

Flag	Coverage Δ
unittests	81.10% <ø> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
...datasets/datasets/top_down/topdown_coco_dataset.py	89.09% <0.00%> (+1.81%)	⬆️

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[innerlee]

Need to add docstring for the function, since I cannot guess what's the implication of is_3d

Nevermind, its a util function for tests