I thought for randu it would work, but it seems that the template parameter would not be considered in this context, only function parameters.

This should pass for repmat in this case

maybe someone needs to propose this to the C++ committee, to change ADL to ATDL 😛
We need to think about functions that do not take MatType as a parameter.
Hopefully we can merge this before Monday

I suppose maybe we will need to make a SafeRandu() function or similar, that dispatches to Armadillo or Bandicoot accordingly. Perhaps sometime a long time from now we can use C++20: https://stackoverflow.com/questions/2953684/why-doesnt-adl-find-function-templates (apparently, ADL for functions with explicit template arguments works; I didn't check to see if it works right).

@mlpack-jenkins test this please