Added base parameter to math.log (#21151)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21151
ghimport-source-id: 76dc0852022a87a000888a787de1391f71923074
Differential Revision: D15563185
Pulled By: Chillee
fbshipit-source-id: 6ed7cc32ed7c103f360022b97f6df47ccd0403e7
