map_location for all

[innerlee]

replacement of #804

[codecov]

Codecov Report

Merging #826 (e21d1c9) into master (999f2d0) will not change coverage.
The diff coverage is 60.00%.

@@           Coverage Diff           @@
##           master     #826   +/-   ##
=======================================
  Coverage   62.92%   62.92%           
=======================================
  Files         145      145           
  Lines        8674     8674           
  Branches     1569     1569           
=======================================
  Hits         5458     5458           
  Misses       2951     2951           
  Partials      265      265           

Flag	Coverage Δ
unittests	62.92% <60.00%> (ø)

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

Impacted Files	Coverage Δ
mmcv/runner/checkpoint.py	68.05% <60.00%> (ø)

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