mseeger commented on issue #9982: Unary ops logcdf_normal, derivlogcdf_normal 
for log CDF of standard n?
   @piiswrong Are you worried about polluting the global namespace with 
specific mathematical functions?
   Any suggestions? Some thoughts:
   - Could move them to random namespace, as this is about functions related to 
random variates.
      Drawback is that random so far has only sampling ops
   - A new namespace, say stats? Drawback: Not much in there
   - An operator called "normal_funcs" with a string arg, which I can set to 
"logcdf", "deriv_logcdf".
      This is just a bit harder to implement, cannot use the default macros for 
unary ops
   - Move to contrib namespace. I'd be OK with this, but note this is just as 
solid as gamma or
      gammaln, there is nothing experimental about this code. I have the 
feeling that stuff in
      contrib is not generally trusted
   These are really useful functions, MXNet should have them. Just let me know 
what to do.

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