Support FP16

[xvjiarui]

Support FP16 #18

[codecov]

Codecov Report

Merging #21 into master will decrease coverage by 0.50%.
The diff coverage is 36.84%.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
- Coverage   81.91%   81.41%   -0.51%     
==========================================
  Files          70       71       +1     
  Lines        3124     3158      +34     
  Branches      485      493       +8     
==========================================
+ Hits         2559     2571      +12     
- Misses        475      497      +22     
  Partials       90       90              

Flag	Coverage Δ
#unittests	81.41% <36.84%> (-0.51%)	⬇️

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% <60.00%> (+1.56%)	⬆️
mmseg/core/utils/__init__.py	100.00% <100.00%> (ø)
mmseg/models/decode_heads/decode_head.py	91.66% <100.00%> (+0.30%)	⬆️

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