34. How Many True Positives?

Question:

In the final project you’ll work on optimizing your POI identifier, using many of the tools learned in this course. Hopefully one result will be that your precision and/or recall will go up, but then you’ll have to be able to interpret them.


Here are some made-up predictions and true labels for a hypothetical test set; fill in the following boxes to practice identifying true positives, false positives, true negatives, and false negatives. Let’s use the convention that “1” signifies a positive result, and “0” a negative.



predictions = [0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1]

true labels = [0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0]

How many true positives are there?