quantrs2_device::vqa_support::objectives

Trait ObjectiveFunction

pub trait ObjectiveFunction: Send + Sync {
    // Required methods
    fn evaluate(
        &self,
        parameters: &Array1<f64>,
    ) -> DeviceResult<ObjectiveResult>;
    fn compute_gradient_with_method(
        &self,
        parameters: &Array1<f64>,
        method: &GradientMethod,
    ) -> DeviceResult<Array1<f64>>;
    fn estimate_cost(&self, parameters: &Array1<f64>) -> usize;
    fn parameter_bounds(&self) -> Option<Vec<(f64, f64)>>;

    // Provided methods
    fn compute_gradient(
        &self,
        parameters: &Array1<f64>,
    ) -> DeviceResult<Array1<f64>> { ... }
    fn supports_batch_evaluation(&self) -> bool { ... }
    fn batch_evaluate(
        &self,
        parameter_sets: &[Array1<f64>],
    ) -> DeviceResult<Vec<ObjectiveResult>> { ... }
}