Aim

What is the machine learning model's aim? For example:

To determine the probability that a retinal image is a member of a diabetic retinopathy class; the classes are no (diabetic retinopathy), mild, moderate, severe, proliferative.
\(\sum\limits_{l \: \in \: L} p(\mathcal{C}_{l}) = 1\), \(\quad L =\) {no, mild, moderate, severe, proliferative}

Note, the model's aim matches the deployed product's model output expectations.