You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hyperparams.rs
    path of file: ./repos/linfa/algorithms/linfa-clustering/src/k_means
    
    the code of the file until where you have to start completion: use crate::KMeansParamsError;

use super::init::KMeansInit;
use linfa::prelude::*;
use linfa::Float;
use linfa_nn::distance::Distance;
use ndarray_
    
    fn check_ref(&self) -> Result<&Self::Checked, Self::Error> {
        if self.0.n_clusters == 0 {
            Err(KMeansParamsError::NClusters)
        } else if self.0.n_runs == 0 {
            Err(KMeansParamsError::NRuns)
        } else if self.0.tolerance <= F::zero() {
            Err(KMeansParamsError::Tolerance)
        } else if self.0.max_n_iterations == 0 {
            Err(KMeansParamsError::MaxIterations)
        } else {
            Ok(&self.0)
        }
    }