A probabilistic neural network (PNN) is a feedforward neural network, which was derived from the Bayesian network and a statistical algorithm called Kernel Fisher discriminant analysis. It was introduced by D.F. Specht in the early 1990s. In a PNN, the operations are organized into a multilayered feedforward network with four layers:
• Input layer
• Hidden layer
• Pattern layer/Summation layer
• Output layer …
Probabilistic Neural Network (PNN) google