在N-dim稀疏Numpy数组中向行/列索引附近的所有单元格添加数字的快速方法？

Is there an efficient way to add the same number (int/float) to all cells adjacent to any given [i,j] or [i,j,k] index in a Numpy array without inefficient looping? Just can't seem to find the right slice command.Is there an efficient way to add the same numbe