Function truncation_select 

pub fn truncation_select<B: Backend>(
    population: &Tensor<B, 2>,
    fitness: &[f32],
    top_k: usize,
    device: &B::Device,
) -> Tensor<B, 2>

Gather the top_k lowest-fitness rows out of the population.

Panics

Inherits the panic conditions of truncation_indices_host: fitness.is_empty() or top_k > fitness.len().