fix init cfg

[jshilong]

Motivation

I think the existence of attributes in an instance should not depend on the value of the arguments. So I change the all hasattr(self, 'init_cfg') to self.init_cfg in BaseModule.

BC-breaking

None

[jshilong]

Please @hhaAndroid @ZwwWayne check whether it affects the existing changes in the downstream codebase.

[codecov]

Codecov Report

Merging #958 (7854c59) into master (ae41150) will decrease coverage by 0.00%.
The diff coverage is 66.66%.

❗ Current head 7854c59 differs from pull request most recent head 92c3c59. Consider uploading reports for the commit 92c3c59 to get more accurate results

@@            Coverage Diff             @@
##           master     #958      +/-   ##
==========================================
- Coverage   65.64%   65.64%   -0.01%     
==========================================
  Files         149      149              
  Lines        9455     9454       -1     
  Branches     1722     1721       -1     
==========================================
- Hits         6207     6206       -1     
  Misses       2928     2928              
  Partials      320      320              

Flag	Coverage Δ
unittests	65.64% <66.66%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
mmcv/runner/base_module.py	78.78% <66.66%> (-0.63%)	⬇️

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[MeowZheng]

LGTM