| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/incubator-teaclave-crates-c8106113f74feefc/ede1f68/rusty-machine/src/learning/knn/brute_force.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>brute_force.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../rusty_machine/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../rusty_machine/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! Bruteforce search implementations |
| </span><span class="kw">use </span>linalg::{Matrix, BaseMatrix}; |
| <span class="kw">use </span>learning::error::Error; |
| |
| <span class="kw">use super</span>::{KNearest, KNearestSearch, get_distances, dist}; |
| |
| <span class="doccomment">/// Perform brute-force search |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>BruteForce { |
| data: <span class="prelude-ty">Option</span><Matrix<f64>>, |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>BruteForce { |
| <span class="doccomment">/// Constructs new brute-force search |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use rusty_machine::learning::knn::BruteForce; |
| /// let _ = BruteForce::default(); |
| /// ``` |
| </span><span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| BruteForce { |
| data: <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="kw">impl </span>BruteForce { |
| <span class="doccomment">/// Constructs new brute-force search. |
| /// BruteForce accepts no parapeters. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use rusty_machine::learning::knn::BruteForce; |
| /// let _ = BruteForce::new(); |
| /// ``` |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| BruteForce::default() |
| } |
| } |
| |
| <span class="doccomment">/// Can search K-nearest items |
| </span><span class="kw">impl </span>KNearestSearch <span class="kw">for </span>BruteForce { |
| |
| <span class="doccomment">/// initialize BruteForce Searcher |
| </span><span class="kw">fn </span>build(<span class="kw-2">&mut </span><span class="self">self</span>, data: Matrix<f64>) { |
| <span class="self">self</span>.data = <span class="prelude-val">Some</span>(data); |
| } |
| |
| <span class="doccomment">/// Serch k-nearest items close to the point |
| </span><span class="kw">fn </span>search(<span class="kw-2">&</span><span class="self">self</span>, point: <span class="kw-2">&</span>[f64], k: usize) -> <span class="prelude-ty">Result</span><(Vec<usize>, Vec<f64>), Error> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>data) = <span class="self">self</span>.data { |
| <span class="kw">let </span>indices: Vec<usize> = (<span class="number">0</span>..k).collect(); |
| <span class="kw">let </span>distances = get_distances(data, point, <span class="kw-2">&</span>indices); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>query = KNearest::new(k, indices, distances); |
| <span class="kw">let </span><span class="kw-2">mut </span>current_dist = query.dist(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>i = k; |
| <span class="kw">for </span>row <span class="kw">in </span>data.row_iter().skip(k) { |
| <span class="kw">let </span>d = dist(point, row.raw_slice()); |
| <span class="kw">if </span>d < current_dist { |
| current_dist = query.add(i, d); |
| } |
| i += <span class="number">1</span>; |
| } |
| <span class="prelude-val">Ok</span>(query.get_results()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Error::new_untrained()) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| |
| <span class="kw">use </span>linalg::Matrix; |
| <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::KNearestSearch; |
| <span class="kw">use </span><span class="kw">super</span>::BruteForce; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_bruteforce_search() { |
| <span class="kw">let </span>m = Matrix::new(<span class="number">5</span>, <span class="number">2</span>, <span class="macro">vec!</span>[<span class="number">1.</span>, <span class="number">2.</span>, |
| <span class="number">8.</span>, <span class="number">0.</span>, |
| <span class="number">6.</span>, <span class="number">10.</span>, |
| <span class="number">3.</span>, <span class="number">6.</span>, |
| <span class="number">0.</span>, <span class="number">3.</span>]); |
| <span class="kw">let </span><span class="kw-2">mut </span>b = BruteForce::new(); |
| b.build(m); |
| |
| <span class="kw">let </span>(ind, dist) = b.search(<span class="kw-2">&</span><span class="macro">vec!</span>[<span class="number">3.</span>, <span class="number">4.9</span>], <span class="number">1</span>).unwrap(); |
| <span class="macro">assert_eq!</span>(ind, <span class="macro">vec!</span>[<span class="number">3</span>]); |
| <span class="macro">assert_eq!</span>(dist, <span class="macro">vec!</span>[<span class="number">1.0999999999999996</span>]); |
| |
| <span class="kw">let </span>(ind, dist) = b.search(<span class="kw-2">&</span><span class="macro">vec!</span>[<span class="number">3.</span>, <span class="number">4.9</span>], <span class="number">2</span>).unwrap(); |
| <span class="macro">assert_eq!</span>(ind, <span class="macro">vec!</span>[<span class="number">3</span>, <span class="number">0</span>]); |
| <span class="macro">assert_eq!</span>(dist, <span class="macro">vec!</span>[<span class="number">1.0999999999999996</span>, <span class="number">3.5227829907617076</span>]); |
| |
| <span class="kw">let </span>(ind, dist) = b.search(<span class="kw-2">&</span><span class="macro">vec!</span>[<span class="number">3.</span>, <span class="number">4.9</span>], <span class="number">3</span>).unwrap(); |
| <span class="macro">assert_eq!</span>(ind, <span class="macro">vec!</span>[<span class="number">3</span>, <span class="number">0</span>, <span class="number">4</span>]); |
| <span class="macro">assert_eq!</span>(dist, <span class="macro">vec!</span>[<span class="number">1.0999999999999996</span>, <span class="number">3.5227829907617076</span>, <span class="number">3.551056180912941</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_bruteforce_untrained() { |
| <span class="kw">let </span>b = BruteForce::new(); |
| <span class="kw">let </span>e = b.search(<span class="kw-2">&</span><span class="macro">vec!</span>[<span class="number">3.</span>, <span class="number">4.9</span>], <span class="number">1</span>); |
| <span class="macro">assert!</span>(e.is_err()); |
| } |
| } |
| </code></pre></div> |
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