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Merge pull request #866 from vks/update-weights
WeightedIndex: Make it possible to update a subset of weights
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// Copyright 2019 Developers of the Rand project. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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#![feature(test)] | ||
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extern crate test; | ||
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use test::Bencher; | ||
use rand::Rng; | ||
use rand::distributions::WeightedIndex; | ||
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#[bench] | ||
fn weighted_index_creation(b: &mut Bencher) { | ||
let mut rng = rand::thread_rng(); | ||
let weights = [1u32, 2, 4, 0, 5, 1, 7, 1, 2, 3, 4, 5, 6, 7]; | ||
b.iter(|| { | ||
let distr = WeightedIndex::new(weights.to_vec()).unwrap(); | ||
rng.sample(distr) | ||
}) | ||
} | ||
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#[bench] | ||
fn weighted_index_modification(b: &mut Bencher) { | ||
let mut rng = rand::thread_rng(); | ||
let weights = [1u32, 2, 3, 0, 5, 6, 7, 1, 2, 3, 4, 5, 6, 7]; | ||
let mut distr = WeightedIndex::new(weights.to_vec()).unwrap(); | ||
b.iter(|| { | ||
distr.update_weights(&[(2, &4), (5, &1)]).unwrap(); | ||
rng.sample(&distr) | ||
}) | ||
} |
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