['11,2019','12,2019']

array([[[11],[2019]],[[12],[2019]]])

arr1= arr.reshpae(-1,1),

array([['11,2019'],['12,2019']])

import numpy as np

arr1=int(arr)

['11,2019','12,2019']  ->  array([[[11],[2019]],[[12],[2019]]])