[Feature] Add NanoDet-Plus head and Dynamic Soft-label Assigner.

[RangiLyu]

No description provided.

[codecov]

Codecov Report

Merging #358 (ea12f13) into v1.0.0-alpha (a805b73) will increase coverage by 0.42%.
The diff coverage is 82.16%.

@@               Coverage Diff                @@
##           v1.0.0-alpha     #358      +/-   ##
================================================
+ Coverage         74.16%   74.59%   +0.42%     
================================================
  Files                62       64       +2     
  Lines              4022     4279     +257     
  Branches            691      723      +32     
================================================
+ Hits               2983     3192     +209     
- Misses              863      910      +47     
- Partials            176      177       +1     

Flag	Coverage Δ
unittests	74.59% <82.16%> (+0.42%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nanodet/util/check_point.py	19.23% <0.00%> (ø)
nanodet/util/logger.py	63.70% <50.00%> (-0.23%)	⬇️
nanodet/model/head/__init__.py	85.71% <66.66%> (+3.89%)	⬆️
nanodet/model/head/nanodet_plus_head.py	77.00% <77.00%> (ø)
nanodet/model/head/assigner/dsl_assigner.py	81.81% <81.81%> (ø)
nanodet/model/head/gfl_head.py	91.57% <100.00%> (+2.45%)	⬆️
nanodet/model/head/nanodet_head.py	100.00% <100.00%> (+5.00%)	⬆️
nanodet/util/box_transform.py	100.00% <100.00%> (+4.34%)	⬆️
nanodet/data/transform/warp.py	84.48% <0.00%> (-1.15%)	⬇️
nanodet/model/loss/utils.py	77.77% <0.00%> (+3.70%)	⬆️
... and 2 more

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