Does Gini-index based classification split values for any attribute always as a binary split or can it split into more than $2$ branches (multi-way split)?
For more clarification, if a split on $A$ partitions $D$ into $D_1$ and $D_2$ , the Gini-index of $D$ given that partitioning is,
This is actually a binary split. Can there be also $D_4, D_5$ etc... too if it is not a binary split so that the formula will be,
