Add Semantic FPN and PointRend

[xvjiarui]

No description provided.

[codecov]

Codecov Report

Merging #35 into master will decrease coverage by 0.22%.
The diff coverage is 76.76%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   81.91%   81.69%   -0.23%     
==========================================
  Files          70       76       +6     
  Lines        3124     3441     +317     
  Branches      485      542      +57     
==========================================
+ Hits         2559     2811     +252     
- Misses        475      532      +57     
- Partials       90       98       +8     

Flag	Coverage Δ
#unittests	81.69% <76.76%> (-0.23%)	⬇️

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

Impacted Files	Coverage Δ
mmseg/core/utils/dist_utils.py	18.51% <18.51%> (ø)
mmseg/models/segmentors/base.py	45.37% <50.00%> (+1.56%)	⬆️
mmseg/models/necks/fpn.py	51.89% <51.89%> (ø)
mmseg/models/decode_heads/decode_head.py	91.66% <80.00%> (+0.30%)	⬆️
mmseg/models/necks/hrfpn.py	81.25% <81.25%> (ø)
mmseg/core/seg/sampler/ohem_pixel_sampler.py	94.59% <90.00%> (+0.65%)	⬆️
mmseg/models/decode_heads/point_head.py	96.58% <96.58%> (ø)
mmseg/core/utils/__init__.py	100.00% <100.00%> (ø)
mmseg/models/__init__.py	100.00% <100.00%> (ø)
mmseg/models/decode_heads/__init__.py	100.00% <100.00%> (ø)
... and 11 more

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[baibaidj]

May I ask when PointRend will be released?

[hellock]

Split into #94 and #109.