If we are talking about "hierarchies of logistic regression nodes" we have to define how to extend logistic regression to multiple outputs. The most common appr

If we are talking about "hierarchies of logistic regression nodes" we have to define how to extend logistic regression to multiple outputs. The most common approach is Multinomial logistic regression: https://en.wikipedia.org/wiki/Logistic_regression#Extensions https://en.wikipedia.org/wiki/Logistic_regression#Extensions . Other times sigmoid might be the right answer.