45 lines
1.1 KiB
Rust
45 lines
1.1 KiB
Rust
use serde::{Deserialize, Serialize};
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use crate::linalg::BaseVector;
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use crate::math::num::RealNumber;
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use crate::metrics::precision::Precision;
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use crate::metrics::recall::Recall;
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#[derive(Serialize, Deserialize, Debug)]
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pub struct F1 {}
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impl F1 {
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pub fn get_score<T: RealNumber, V: BaseVector<T>>(&self, y_true: &V, y_pred: &V) -> T {
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if y_true.len() != y_pred.len() {
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panic!(
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"The vector sizes don't match: {} != {}",
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y_true.len(),
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y_pred.len()
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);
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}
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let beta2 = T::one();
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let p = Precision {}.get_score(y_true, y_pred);
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let r = Recall {}.get_score(y_true, y_pred);
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(T::one() + beta2) * (p * r) / (beta2 * p + r)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn f1() {
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let y_pred: Vec<f64> = vec![0., 0., 1., 1., 1., 1.];
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let y_true: Vec<f64> = vec![0., 1., 1., 0., 1., 0.];
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let score1: f64 = F1 {}.get_score(&y_pred, &y_true);
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let score2: f64 = F1 {}.get_score(&y_true, &y_true);
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assert!((score1 - 0.57142857).abs() < 1e-8);
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assert!((score2 - 1.0).abs() < 1e-8);
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}
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}
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