Best + Worst Curves and Models
Understand the best and worst possible curves as well as the comparison between the best and worst models.
We'll cover the following
Best and worst curves
Let us ask ourselves: what would the best possible (and the worst possible) curves look like?
The best curve belongs to a model that predicts everything perfectly; it gives us a 100% probability to all actual positive data points and 0% probability to all actual negative data points. Of course, such a model does not exist in real life. But cheating does exist. So, let us cheat and use the true labels as the probabilities. These are the curves we get:
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