EasyNLPnlp-386

Beam Score Length Normalization

Problem

Length-normalized beam scoring divides the cumulative log probability by length^alpha.

Given the log probability, the sequence length, and alpha, return the normalized score.

Hint

Alpha equal to one is the plain average log probability.

case 1

in: [-2,4,1]

expected: -0.5

case 2

in: [-6,3,0.5]

expected: -3.464101615137755

case 3

in: [0,1,2]

expected: 0

Starter codePython

def beam_score_length_normalization(logprob, length, alpha):
    # Your code here
    pass

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