Function mgrade 

pub fn mgrade(d_in: usize, d_hidden: usize) -> StreamingMGrade

Create a streaming mGRADE (minimal recurrent gating with delay convolutions).

use irithyll::{mgrade, StreamingLearner};

let mut model = mgrade(3, 16);
model.train(&[1.0, 2.0, 3.0], 4.0);
let pred = model.predict(&[1.0, 2.0, 3.0]);