[Feature] Add OneCycleLrUpdaterHook

[zhouzaida]

Related Issue: #896

[MeowZheng]

One Cycle LR Scheduler

[zhouzaida]

ok

[codecov]

Codecov Report

Merging #906 (d146707) into master (5f5e8e8) will decrease coverage by 1.31%.
The diff coverage is 38.18%.

❗ Current head d146707 differs from pull request most recent head 602fe1c. Consider uploading reports for the commit 602fe1c to get more accurate results

@@            Coverage Diff             @@
##           master     #906      +/-   ##
==========================================
- Coverage   65.93%   64.61%   -1.32%     
==========================================
  Files         147      148       +1     
  Lines        8992     9352     +360     
  Branches     1614     1698      +84     
==========================================
+ Hits         5929     6043     +114     
- Misses       2747     2962     +215     
- Partials      316      347      +31     

Flag	Coverage Δ
unittests	64.61% <38.18%> (-1.32%)	⬇️

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

Impacted Files	Coverage Δ
mmcv/cnn/bricks/transformer.py	0.00% <0.00%> (ø)
mmcv/runner/base_module.py	79.41% <0.00%> (ø)
mmcv/runner/hooks/momentum_updater.py	51.48% <44.21%> (-6.85%)	⬇️
mmcv/runner/hooks/lr_updater.py	57.54% <60.00%> (+0.72%)	⬆️
mmcv/onnx/symbolic.py	40.60% <75.00%> (+0.71%)	⬆️
mmcv/cnn/utils/weight_init.py	91.57% <84.00%> (-7.28%)	⬇️
mmcv/image/geometric.py	94.19% <92.00%> (-0.28%)	⬇️
mmcv/image/photometric.py	99.26% <92.85%> (-0.74%)	⬇️
mmcv/cnn/bricks/registry.py	100.00% <100.00%> (ø)
mmcv/image/__init__.py	100.00% <100.00%> (ø)
... and 3 more

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