support multiple interpolation modes for imrotate

[hkzhang95]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #545 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #545   +/-   ##
=======================================
  Coverage   64.70%   64.70%           
=======================================
  Files         131      131           
  Lines        7529     7529           
  Branches     1331     1331           
=======================================
  Hits         4872     4872           
  Misses       2411     2411           
  Partials      246      246           

Flag	Coverage Δ
#unittests	64.70% <100.00%> (ø)

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

Impacted Files	Coverage Δ
mmcv/image/geometric.py	94.47% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c843596...c8419b2. Read the comment docs.