<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69907841">src/mlpack/core/data/map_policies/datatype.hpp</a>:</p>
<pre style='color:#555'>> +
> +namespace mlpack {
> +namespace data {
> +
> +/**
> + * The Datatype enum specifies the types of data mlpack algorithms can use.
> + * The vast majority of mlpack algorithms can only use numeric data (i.e.
> + * float/double/etc.), but some algorithms can use categorical data, specified
> + * via this Datatype enum and the DatasetMapper class.
> + */
> +enum Datatype : bool /* [> bool is all the precision we need for two types <] */
> +{
> + numeric = 0,
> + categorical = 1
> +};
> +
</pre>
<p>This is very pedantic but there is an extra line here. :)</p>
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