[GitHub] chinakook commented on issue #9265: Add label_from_zero_one argument to LogisticLoss

[GitBox <gi...@apache.org>]

chinakook commented on issue #9265: Add label_from_zero_one argument to LogisticLoss
URL: https://github.com/apache/incubator-mxnet/pull/9265#issuecomment-355001691
 
 
   +1 and -1 label is very convenient because the loss and the backward can be calculated in a more mathematical elegant way. 
   However, the autograd mechanism of gluon implementation cannot get benefit from that because the backward can be manually(tricky) calculated as "grad = -label / (1 + exp(pred * label))" which is more numerical stable.
   So, I think +1 and -1 label may not have much effect here.

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