Bayes Factor

Problem

Return the log Bayes factor comparing two models:

log BF = log_evidence1 - log_evidence0

Positive values favor model 1. Both inputs are log evidences from the same data.

Hint

Working in logs turns the evidence ratio into a difference.

case 1

in: [0,0]

expected: 0

case 2

in: [5,3]

expected: 2

case 3

in: [-10,-12]

expected: 2

case 4

in: [1,2]

expected: -1

Starter codePython

def bayes_factor(log_evidence1, log_evidence0):
    # Your code here
    pass

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