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There are a number of models of neural networks have been developed, each defined at a different level of abstraction and trying to model different aspects of neural systems.

**TYPES OF NEURAL NETWORKS**

There are a number of models of neural networks have been developed,
each defined at a different level of abstraction and trying to model different
aspects of neural systems. They range from models of the short term behaviour
of individual neurons, through models of how the dynamics of neural circuitry
arise from interactions between individual neurons, to models of how behaviour
can arise from abstract neural modules that represent complete sub systems.
Some neural networks have been illustrated below.

**Single Layer Network**

A single layer Ineural networkW consists of a set of units organized in
a layer. Each unit Un receives a weighted input I(j) with weight w(jn) Figure shows a
single layer neural network with j inputs and n outputs.

**Multilayer Network**

A multilayer network has two or more layers of units, with the output
from one layer serving as input to the next. Generally in a multilayer network
there are 3 layers present like, input layer, output layer and hidden layer.
The layer with no external output connections are referred to as hidden layers.
A multilayer neural network structure is given in figure.

So a linear system with any number n of layers is equivalent to a single
layer linear system whose weight matrix is the product of the n intermediate
weight matrices. A multilayer system that is not linear can provide more
computational capability than a single layer system. Generally multilayer networks
have proven to be very powerful than single layer neural network. Any type of
Boolean function can be implemented by such a network. At the output layer of a
multilayer neural network the output vector is compared to the expected output.
If the difference is zero, no changes are made to the weights of connections.
If the difference is not zero, the error is calculated and is propagated back
through the network.

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