It's definitely just a typo. The ordered categories are A, C, B so the
other split can't be A | B, C. Just open a PR.
On Thu, Aug 7, 2014 at 2:11 AM, Matt Forbes wrote:
> I found the section on ordering categorical features really interesting,
> but the A, B, C example seemed inconsistent. Am I interpreting this passage
> wrong, or are there typos? Aren't the split candidates A | C, B and A, C |
> B ?
>
> For example, for a binary classification problem with one categorical
> feature with three categories A, B and C with corresponding proportion of
> label 1 as 0.2, 0.6 and 0.4, the categorical features are ordered as A
> followed by C followed B or A, B, C. The two split candidates are A | C, B
> and A , B | C where | denotes the split.
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