python - Find the less frequent number in a NumPy array

Question

Suppose I have the following NumPy array:

a = np.array([1,2,3,1,2,1,1,1,3,2,2,1])

How can I find the less frequent number in this array?

question from:https://stackoverflow.com/questions/65849980/find-the-less-frequent-number-in-a-numpy-array

Answer 1

Use collections.Counter-

from collections import Counter
a = Counter([1,2,3,1,2,1,1,1,3,2,2,1])
print(a.most_common()[-1][0])