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.
