how to change the value type of tensor directly

[CSDotNET0211]

i would like to change the weight/bias for neuroevolution
only way i found is like this (need to change Linear.weight() as mutable)

let weight = model.ln1.weight();
let weight_vec2 = weight.to_vec2::<f32>().unwrap();
let weight_vec1 = weight_vec2.concat();
weight_vec1[0] = 1234.;
let new_weight = Tensor::from_vec(weight_vec1, weight.shape(), weight.device()).unwrap();

any idea for better way?