Custom rand::Rng about rust-autograd HOT 3 CLOSED

let arr1 = ndarray_ext::ArrRng::default().glorot_uniform(&[2, 3]);
let arr2 = ndarray_ext::ArrRng::new(Pcg).glorot_uniform(&[2, 3]);

    struct ArrRng<R: Rng> {
        rng: R
    }

    impl Default for ArrRng<rand::XorShiftRng>
    {
        fn default() -> Self
        {
            ArrRng {
                rng: rand::weak_rng()
            }
        }
    }

    impl<R: Rng> ArrRng<R> {
        pub fn new(rng: R) -> Self
        {
            ArrRng {
                rng
            }
        }
    }

    impl<R: Rng> ArrRng<R>
    {
        pub fn glorot_uniform(&mut self, shape: &[usize]) -> NdArray
        {
            let s = (6. / shape[0] as f64).sqrt();
            let dist = rand::distributions::Range::new(-s, s);
            NdArray::from_shape_fn(shape, |_| dist.ind_sample(&mut self.rng) as f32)
        }
        ...
    }