[mlpack-git] [mlpack/mlpack] PARAM_VECTOR_IN seems not to be working (#798)

[Ivan Georgiev]

Having a definition like this:

```
PARAM_VECTOR_IN(size_t, "ignore_dimensions", "The indices of dimensions to be ignored "
    "on split attempts.", "n");
```

and passing parameters like `-n 0,2` produces an exception in `CLI::ParseCommandLine(argc, argv);` call. The output is this:

```
[FATAL]: Caught exception from parsing command line:	the argument ('0, 2') for option '--ignore_dimensions' is invalid

libc++abi.dylib: terminating with uncaught exception of type std::runtime_error: fatal error; see Log::Fatal output
Program ended with exit code: 9
```
which is rather strange, because this is very close to the example of `PARAM_VECTOR_IN` usage given in the comment next to its declaration.

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