let aa = Array::from_vec(vec![0.1, 0.2]);
  let ab = Array::from_vec(vec![0.1, 0.2]);
  let vv: Vec<ndarray::Array1<f32>> = vec![aa, ab];
  let mut w = BufWriter::new(File::create("/tmp/foo.bar").unwrap());
  serialize_into(&mut w, &vv).unwrap();
  drop(w);


  let f = File::open("/tmp/foo.bar").unwrap();
  let mut rdr = BufReader::new(f);
  let decoded_vv: Vec<ndarray::Array1<f32>>  = deserialize_from(&mut rdr).unwrap();