Introduction to Machine Learning

Machine Learning

is useful when

  1. the pattern exists.
  2. it is difficult to pin down the problem mathematically.
  3. you have a data.

Pattern is an entity vaguely defined that could be given a name


Examples of patterns are palindromes in a sequence, spatial configuration of pixels in character recognition, speech signal in spectrogram, the salary, age, and debt records in credit card applications.

Learning is a process by which parameters of a learning machine are modified through a continuous process of stimulation by the environment in which it is embedded.



In Figure 1, parameters of the learning machine are tweaked based from the error signal.

Learning Paradigm

  1. Supervised Learning -with the help of a teacher
  2. Unsupervised Learning – with the help of a critic

Why unsupervised learning is important?

It is important because it may lead to a  new pattern, thus leading to knowledge discovery.




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