Class Imbalance Ratio

Problem

Compute the class imbalance ratio: count of the majority class divided by count of the minority class.

A single class gives 1.0; empty input returns 0.0.

Hint

Ratio of the largest class count to the smallest.

case 1

in: [["a","a","a","b"]]

expected: 3

case 2

in: [[1,1,2,2]]

expected: 1

case 3

in: [[5]]

expected: 1

case 4

in: [[]]

expected: 0

Starter codePython

def imbalance_ratio(labels):
    # Your code here
    pass

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