Crate cagra

Examples

Create a graph for (x + y) - z

use cagra::graph::*;

let mut g: Graph<f64> = Graph::new();
// x = 1.0
let x = g.scalar_variable("x", 1.0);
// y = 2.0
let y = g.scalar_variable("y", 2.0);
// tmp = x + y
let tmp = g.add(x, y);
// z = -3.0
let z = g.scalar_variable("z", -3.0);
// sum = tmp - z
let sum = g.sub(tmp, z);

g.eval_value(sum, false).unwrap();
let result = g.get_value(sum).unwrap().as_scalar().unwrap();
assert!((result - 6.0).abs() < 1e-7);

g.eval_deriv(sum).unwrap();
let dx = g.get_deriv(x).unwrap().as_scalar().unwrap();
let dy = g.get_deriv(y).unwrap().as_scalar().unwrap();
let dz = g.get_deriv(z).unwrap().as_scalar().unwrap();
assert!((dx - 1.0).abs() < 1e-7);
assert!((dy - 1.0).abs() < 1e-7);
assert!((dz + 1.0).abs() < 1e-7);

Modules

error	Errors in cagra
graph	Calculation graph
operators	Value and operators in calculation graph