[Feature] Add nanodet-plus and support grad clip.

[RangiLyu]

No description provided.

[codecov]

Codecov Report

Merging #362 (6378dc0) into v1.0.0-alpha (2ca268a) will increase coverage by 0.05%.
The diff coverage is 75.00%.

@@               Coverage Diff                @@
##           v1.0.0-alpha     #362      +/-   ##
================================================
+ Coverage         73.94%   74.00%   +0.05%     
================================================
  Files                64       66       +2     
  Lines              4330     4424      +94     
  Branches            735      752      +17     
================================================
+ Hits               3202     3274      +72     
- Misses              948      970      +22     
  Partials            180      180              

Flag	Coverage Δ
unittests	74.00% <75.00%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
nanodet/model/head/gfl_head.py	86.55% <0.00%> (-0.35%)	⬇️
nanodet/model/head/nanodet_head.py	75.64% <0.00%> (-2.57%)	⬇️
nanodet/util/check_point.py	17.85% <0.00%> (-1.38%)	⬇️
nanodet/model/arch/nanodet_plus.py	47.82% <47.82%> (ø)
nanodet/trainer/task.py	53.59% <50.00%> (-0.05%)	⬇️
nanodet/model/arch/one_stage_detector.py	60.00% <66.66%> (+0.54%)	⬆️
nanodet/model/head/__init__.py	88.23% <66.66%> (+2.52%)	⬆️
nanodet/model/head/nanodet_plus_head.py	72.76% <66.66%> (-1.53%)	⬇️
nanodet/model/arch/__init__.py	68.75% <75.00%> (+18.75%)	⬆️
nanodet/model/head/simple_conv_head.py	100.00% <100.00%> (ø)
... and 5 more

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