[Improvement] Move train_cfg/test_cfg inside model

[xvjiarui]

No description provided.

[codecov]

Codecov Report

Merging #341 (55fc5c6) into master (49515e7) will decrease coverage by 0.02%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
- Coverage   86.07%   86.04%   -0.03%     
==========================================
  Files          95       95              
  Lines        4789     4795       +6     
  Branches      778      779       +1     
==========================================
+ Hits         4122     4126       +4     
- Misses        519      520       +1     
- Partials      148      149       +1     

Flag	Coverage Δ
unittests	86.04% <71.42%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
mmseg/models/builder.py	81.48% <60.00%> (-4.89%)	⬇️
mmseg/apis/inference.py	66.07% <100.00%> (+0.61%)	⬆️

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[callzhang]

This broke the tutorial code in MMSegmentation_Tutorial.ipynb:
model = build_segmentor(cfg.model, train_cfg=cfg.train_cfg, test_cfg=cfg.test_cfg)
It would be great if you can also fix the demo.

[Brainkite]

This broke the tutorial code in MMSegmentation_Tutorial.ipynb:
model = build_segmentor(cfg.model, train_cfg=cfg.train_cfg, test_cfg=cfg.test_cfg)
It would be great if you can also fix the demo.

Since it's now stored in cfg.model just removing the parameters works:
model = build_segmentor(cfg.model)