#![allow(unused_imports)]
extern crate argmin;
extern crate argmin_testfunctions;
use argmin::prelude::*;
use argmin::solver::gradientdescent::SteepestDescent;
use argmin::solver::linesearch::HagerZhangLineSearch;
use argmin::solver::linesearch::MoreThuenteLineSearch;
use argmin_testfunctions::{rosenbrock_2d, rosenbrock_2d_derivative};
struct Rosenbrock {
a: f64,
b: f64,
}
impl ArgminOp for Rosenbrock {
type Param = Vec<f64>;
type Output = f64;
type Hessian = ();
type Jacobian = ();
type Float = f64;
fn apply(&self, p: &Self::Param) -> Result<Self::Output, Error> {
Ok(rosenbrock_2d(p, self.a, self.b))
}
fn gradient(&self, p: &Self::Param) -> Result<Self::Param, Error> {
Ok(rosenbrock_2d_derivative(p, self.a, self.b))
}
}
fn run() -> Result<(), Error> {
let cost = Rosenbrock { a: 1.0, b: 100.0 };
let init_param: Vec<f64> = vec![1.2, 1.2];
let linesearch = MoreThuenteLineSearch::new();
let solver = SteepestDescent::new(linesearch);
let res = Executor::new(cost, solver, init_param)
.add_observer(ArgminSlogLogger::term(), ObserverMode::Always)
.max_iters(10)
.run()?;
std::thread::sleep(std::time::Duration::from_secs(1));
println!("{}", res);
Ok(())
}
fn main() {
if let Err(ref e) = run() {
println!("{}", e);
std::process::exit(1);
}
}