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handle errors cleanly rather than crashing #1010

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Merged
montanalow merged 2 commits into from
Sep 12, 2023
Merged

handle errors cleanly rather than crashing #1010

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handle errors cleanly rather than crashing
montanalow Sep 12, 2023
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montanalow Sep 12, 2023
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9 changes: 7 additions & 2 deletions pgml-extension/src/metrics.rs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
/// Module providing various metrics used to rank the algorithms.
use pgrx::*;
use std::collections::{BTreeSet, HashMap};

use ndarray::{Array2, ArrayView1};
Expand Down Expand Up @@ -51,13 +52,17 @@ impl ConfusionMatrix {
y_hat: &ArrayView1<usize>,
num_classes: usize,
) -> ConfusionMatrix {
assert_eq!(ground_truth.len(), y_hat.len());
if ground_truth.len() != y_hat.len() {
error!("Can't compute metrics when the ground truth labels are a different size than the predicted labels. {} != {}", ground_truth.len(), y_hat.len())
};

// Distinct classes.
let mut classes = ground_truth.iter().collect::<BTreeSet<_>>();
classes.extend(&mut y_hat.iter().collect::<BTreeSet<_>>().into_iter());

assert_eq!(num_classes, classes.len());
if num_classes != classes.len() {
error!("Can't compute metrics when the number of classes in the test set is different than the number of classes in the training set. {} != {}", num_classes, classes.len())
};

// Class value = index in the confusion matrix
// e.g. class value 5 will be index 4 if there are classes 1, 2, 3 and 4 present.
Expand Down