[Feature] Support ignore boxes in nanodet head

[zero0kiriyu]

No description provided.

[codecov]

Codecov Report

Merging #480 (128955d) into main (ad410c2) will decrease coverage by 0.02%.
The diff coverage is 54.54%.

@@            Coverage Diff             @@
##             main     #480      +/-   ##
==========================================
- Coverage   74.71%   74.69%   -0.03%     
==========================================
  Files          70       70              
  Lines        4572     4600      +28     
  Branches      777      716      -61     
==========================================
+ Hits         3416     3436      +20     
- Misses        971      974       +3     
- Partials      185      190       +5     

Flag	Coverage Δ
unittests	74.69% <54.54%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
nanodet/data/dataset/coco.py	74.44% <0.00%> (+1.61%)	⬆️
nanodet/model/head/assigner/atss_assigner.py	85.13% <25.00%> (-7.41%)	⬇️
nanodet/model/head/assigner/dsl_assigner.py	83.33% <28.57%> (+1.51%)	⬆️
nanodet/data/transform/warp.py	84.44% <50.00%> (-0.04%)	⬇️
nanodet/model/head/nanodet_plus_head.py	73.87% <76.47%> (+0.97%)	⬆️
nanodet/model/head/gfl_head.py	86.00% <80.00%> (-0.55%)	⬇️
nanodet/model/loss/utils.py	74.07% <0.00%> (-3.71%)	⬇️
... and 1 more

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