Function autograd::run

pub fn run<F, FN, R>(f: FN) -> R where
    F: Float,
    FN: FnOnce(&mut Graph<F>) -> R, 

Creates a scope for a computation graph.

This is the preferred way to create Graph instances.

use autograd as ag;
use ag::ndarray;
let grad = ag::run(|g| {
    let x = g.placeholder(&[]);
    let y = g.placeholder(&[]);
    let z = 2.*x*x + 3.*y + 1.;

    // dz/dx (symbolic):
    let grad = &g.grad(&[z], &[x])[0];

    // Evaluate dz/dx when x=3:
    grad.eval(&[x.given(ndarray::arr0(3.0).view())]).unwrap()
});
assert_eq!(grad, ndarray::arr0(12.0).into_dyn());