xtensor concatenate behavior differs much from numpy when only concatenate one element

[WymanY]

when use numpy like this:

a = np.arange(24).reshape(2,3,2,2)
//it produces
array([[[[ 0,  1],
         [ 2,  3]],

        [[ 4,  5],
         [ 6,  7]],

        [[ 8,  9],
         [10, 11]]],


       [[[12, 13],
         [14, 15]],

        [[16, 17],
         [18, 19]],

        [[20, 21],
         [22, 23]]]])

np.concatenate(a,1)
//it produces this
array([[[ 0,  1],
        [ 2,  3],
        [12, 13],
        [14, 15]],

       [[ 4,  5],
        [ 6,  7],
        [16, 17],
        [18, 19]],

       [[ 8,  9],
        [10, 11],
        [20, 21],
        [22, 23]]])

//when use xtensor
xt::xarray<int>a = xt::arange<int>(24).reshape({2,3,4,4})
xt::concatenate(xt::xtuple(),1);

//it proudces itself, do nothing.

I have no idea how to make xtensor's concatencat behave like numpy or achieve this effect. I am a newbie for c++. I tried a lot, but to no avail.

If you have any good way, please let me know.