Divergence Detector

Problem

Detect divergence in a loss sequence.

Return the first index i > 0 where losses[i] > factor * losses[i - 1], or -1 if the losses never jump by more than the factor. A list with fewer than two entries returns -1.

Hint

Compare each loss against factor times the immediately preceding loss.

Test cases

case 1

in: [[1,1.1,1.2],2]

expected: -1

case 2

in: [[1,3,3.1],2]

expected: 1

case 3

in: [[0.5,0.5,0.5],1]

expected: -1

case 4

in: [[],2]

expected: -1

case 5

in: [[1,2,4,8],1.5]

expected: 1

Starter codePython

def divergence_detector(losses, factor):
    # Your code here
    pass

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