splitEvenOdd2D

auto x = tensor!([0, 1, 2, 2])([1.0, 2.0, 3.0, 4.0]);

auto sh = splitEvenOdd2D(x); // split by height
assert(sh[0].shape == [1, 1, 1, 2]);
assert(sh[0].value == [[[[1.0, 2.0]]]]);
assert(sh[1].shape == [1, 1, 1, 2]);
assert(sh[1].value == [[[[3.0, 4.0]]]]);

sh[0].backward();
sh[1].backward();

auto sw = splitEvenOdd2D!3(x); // split by width
assert(sw[0].shape == [1, 1, 2, 1]);
assert(sw[0].value == [[[[1.0], [3.0]]]]);
assert(sw[1].shape == [1, 1, 2, 1]);
assert(sw[1].value == [[[[2.0], [4.0]]]]);

sw[0].backward();
sw[1].backward();

auto x = tensor!([0, 2, 2, 2], UseGradient.no)([1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0]);

auto sh = splitEvenOdd2D!2(x); // split by height
assert(sh[0].shape == [1, 2, 1, 2]);
assert(sh[0].value == [[[[1.0, 2.0]], [[5.0, 6.0]]]]);
assert(sh[1].shape == [1, 2, 1, 2]);
assert(sh[1].value == [[[[3.0, 4.0]], [[7.0, 8.0]]]]);

static assert(!canBackward!(typeof(sh)));

auto sw = splitEvenOdd2D!3(x); // split by width
assert(sw[0].shape == [1, 2, 2, 1]);
assert(sw[0].value == [[[[1.0], [3.0]], [[5.0], [7.0]]]]);
assert(sw[1].shape == [1, 2, 2, 1]);
assert(sw[1].value == [[[[2.0], [4.0]], [[6.0], [8.0]]]]);

static assert(!canBackward!(typeof(sw)));