DEBUG: list type can not match cv2.mat

[Shawn-Tao]

The code

meta = naive_collate([meta])

changes type of meta['raw_img'] to "list" which can lead to error while call the following code:

result = overlay_bbox_cv(meta['raw_img'], res[0], cfg.class_names, score_thresh=0.35)

[codecov]

Codecov Report

Merging #423 (f845192) into main (3cda376) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #423   +/-   ##
=======================================
  Coverage   74.25%   74.25%           
=======================================
  Files          66       66           
  Lines        4459     4459           
  Branches      756      756           
=======================================
  Hits         3311     3311           
  Misses        969      969           
  Partials      179      179           

Flag	Coverage Δ
unittests	74.25% <ø> (ø)

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