3. Classification algorithms
3. Classification algorithms#
Let’s enter the vast world of classification algorithms in machine learning.
In classification, the outcomes - the targets - are no more real-valued but class labels that can be associated with discrete numericals. While it could appear as a sub-case of the linear regression, we will see that we need to redefine our mathematical tools.
In this lecture we will cover a method for classifying data called logistic regression. You will discover key machine learning concepts:
The sigmoid function
A revised cost function for logistic regression
Regularization
Performance metrics to diagnose how well the model fits the data and what to do to get a better fit
Particle physics florishes of classification implementations. We will put the logistic regression in practice during the assignment to classify collision data.