import math

def avg_entropy(num_arr):
    num_arr = list(map(lambda x: x * math.log2(x), num_arr))
    return -sum(num_arr)

if __name__=='__main__':
    input_num = [0.05, 0.25, 0.70]
    output = avg_entropy(input_num)
    print('output :', output)
    # output : 1.0762976257251988