What does feature extraction mean?
When you transform or compress data in order to reduce dimensionality
Example:
Transforming a (colored) picture out of 3 colors into a black/ white picture with one color
What does feature selection mean
From a given set of features: When you select the ones that will optimize the learning performance
Does the human brain perform feature extraction?
Yes, for example when you see two people dancing. Out of every other information and data you are able to recognize that one of the two is your friend Maria. So yes our brains are reducing information to the minimum necessary to solve tasks
so voice recognition
or face recognition
Why do we need to perform feature extration and selection in data science?
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