Exponential Smoothing

Problem

Apply simple exponential smoothing to a sequence: s_0 = x_0 and s_t = alpha * x_t + (1 - alpha) * s_{t-1}.

Return the smoothed values as a list; empty input returns [].

Hint

Each smoothed value blends the current observation with the previous smoothed value.

case 1

in: [[1,2,3],0.5]

expected: [1,1.5,2.25]

case 2

in: [[10,20,30],1]

expected: [10,20,30]

case 3

in: [[5,5,5],0.3]

expected: [5,5,5]

case 4

in: [[4],0.9]

expected: [4]

Starter codePython

def exponential_smoothing(values, alpha):
    # Your code here
    pass

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