Kohonen network’s nodes can be in a rectangular (left) or hexagonal (right) topology. A Self-Organising Map, additionally, uses competitive learning as opposed to error-correction learning, to adjust it weights.

What is a self-organising map in Kohonen network?

Kohonen network’s nodes can be in a rectangular (left) or hexagonal (right) topology. A Self-Organising Map, additionally, uses competitive learning as opposed to error-correction learning, to adjust it weights.

What is a self-organizing map (SOM)?

As a basic type of ANNs, let’s consider a self-organizing map (SOM) or self-organizing feature map (SOFM) that is trained using unsupervised learning to produce a low-dimensional, discretized representation of the input space of the training samples, called a map. Self Organizing Map?

What is a Kohonen network?

A Kohonen network consists of two layers of processing units called an input layer and an output layer. There are no hidden units.

Who discovered self-organizing map?

It is discovered by Finnish professor and researcher Dr. Teuvo Kohonen in 1982. The self-organizing map refers to an unsupervised learning model proposed for applications in which maintaining a topology between input and output spaces.

What is the iteration limit of a Kohonen model?

A Kohonen model with the BMU in yellow, the layers inside the neighbourhood radius in pink and purple, and the nodes outside in blue. n is the iteration limit, i.e. the total number of iterations the network can undergo λ is the time constant, used to decay the radius and learning rate

How to calculate the Euclidean distance between two nodes in Kohonen network?

As such, after clustering, each node has its own (i,j) coordinate, which allows one to calculate the Euclidean distance between 2 nodes by means of the Pythagorean theorem. Kohonen network’s nodes can be in a rectangular (left) or hexagonal (right) topology.

Is it possible to implement self-organizing maps using MATLAB?

Using the above algorithm, a few interesting examples that have mentioned in Self-Organizing Maps Book by Teuvo Kohonen² have been implemented using MATLAB and you can clone it to your local computer as follows: Let’s define the repository’s home as .