Numpy:在某些位置修改数组元素

I have an array a:

我有一个数组a:

array([[[[14, 59, 18, 92],
     [91, 38, 58, 23],
     [33, 52, 93, 68],
     [19, 21, 50, 77]],

    [[90, 37, 22, 55],
     [56, 54, 10, 16],
     [83, 20, 36,  3],
     [84, 87, 85, 81]]],

   [[[ 0, 45, 72,  5],
     [49, 46, 94, 53],
     [34, 51, 75,  8],
     [27, 79, 35, 15]],

    [[ 7, 86, 64, 31],
     [12, 70, 89, 62],
     [13, 63, 88, 25],
     [39, 11, 26,  6]]]])
array([[[[14, 5