如何使用rust将二维数组转换为二维向量？

[dependencies]
ndarray = "0.15.3"

use ndarray::{Array, Array2};

fn array_to_vector(arr: [[T; N]; M]) -> Array2<T> {
    let vec: Vec<T> = arr.iter().flatten().cloned().collect();
    Array::from_shape_vec((M, N), vec).unwrap()
}

fn main() {
    let arr: [[i32; 3]; 2] = [[1, 2, 3], [4, 5, 6]];
    let vec = array_to_vector(arr);
    println!("{:?}", vec);
}

use ndarray::{Array, Array2};

fn array_to_vector(arr: [[T; N]; M]) -> Array2<T> {
    let vec: Vec<T> = arr.iter().flatten().cloned().collect();
    Array::from_shape_vec((M, N), vec).unwrap()
}

fn main() {
    let arr: [[i32; 3]; 2] = [[1, 2, 3], [4, 5, 6]];
    let vec = array_to_vector(arr);
    println!("{:?}", vec);
}