At first, calculate the gain ratio of each attribute. The root node will be the attribute whose gain ratio is maximum. C4.5 uses pessimistic pruning to remove unnecessary branches in the decision tree to improve the accuracy of classification.
At first, calculate the gain ratio of each attribute. The root nodewill be the attribute whose gain ratio is maximum. C4.5 usespessimistic pruning to remove unnecessary branches in thedecision tree to improve the accuracy of classification.