ABSTRACT
In this chapter, we learn the concept, usefulness, and execution of
dimensionality reduction. This important topic has been exten-
sively studied in different disciplines. A large variety of techniques
have been developed and there have been numerous articles in the
literature including several accessible surveys [BDR+06, HLMS04]
and even books [CC94, STC04]. Here we shall present and discuss
only a sampler of techniques and illuminate them using visually
intuitive examples.