try to enable uncertainty for lr loss (#17236)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17236
Following the paper in https://papers.nips.cc/paper/7141-what-uncertainties-do-we-need-in-bayesian-deep-learning-for-computer-vision.pdf, approximate the classification case with the regression formulation. For the LRLoss, add penalty based on the variance and regularization on the variance with a tunable parameter lambda.
Reviewed By: chocjy
Differential Revision: D14077106
fbshipit-source-id: 4405d8995cebdc7275a0dd07857d32a8915d78ef
