F1 Score from Counts

Problem

Return the F1 score from true positives tp, false positives fp, and false negatives fn: 2*tp / (2*tp + fp + fn). Return 0.0 when the denominator is zero.

Hint

It is the harmonic mean of precision and recall.

Test cases

case 1

in: [5,1,2]

expected: 0.7692307692307693

case 2

in: [0,0,0]

expected: 0

case 3

in: [3,0,0]

expected: 1

case 4

in: [1,0,1]

expected: 0.6666666666666666

case 5

in: [4,1,0]

expected: 0.8888888888888888

Starter codePython

def f1_score(tp, fp, fn):
    # Your code here
    pass

5 test cases · run your code against them in the editor