COMP9444/9844 Neural Networks

Feedback Quiz on Self-organising Systems

This is a voluntary quiz to help you decide whether you have understood some of the major concepts from this topic. It carries no marks.

  1. What is the difference between supervised learning and unsupervised learning?

  2. In a self-organising map, how are the output neurons organised?

  3. What is the name of the process in Kohonen's SOM algoritm in which the winning neuron is chosen?

  4. If a neuron is next to the winning neuron in a cycle of the SOM learning algorithm, in the middle of the self-organising or ordering phase, will its weights change?

  5. In the neighbourhood width function σ(n) described in lectures, does the width increase or decrease as time goes on, and is the change linear, geometrical or exponential?

  6. What is the "diameter" of a m×n 2-D SOM?

  7. What is a quantizer?

Solutions: don't read until you've tried the questions yourself.

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