Backup Value At Leaf

Problem

Back up a leaf value into a node's running average.

Return (total_value + leaf_value) / (visits + 1), the new mean action value after one more visit.

Hint

Incremental averaging keeps the node's Q estimate exact.

case 1

in: [10,2,4]

expected: 4.666666666666667

case 2

in: [0,0,3]

expected: 3

case 3

in: [-2,3,-6]

expected: -2

Starter codePython

def backup_value_at_leaf(total_value, visits, leaf_value):
    # Your code here
    pass

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