Implementing Softplus operator #4690
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LGTM, but need to fix conflict first. You need to pull rebase the latest develop branch. |
kexinzhao
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Fixes #4442
Original formula: y = log (1 + exp(x))
Following similar trick as in #4663 for numerical stability (reference below):
https://hips.seas.harvard.edu/blog/2013/01/09/computing-log-sum-exp/