use crate::evaluator::*;
macro_const! {
const DOC: &str = r#"
Weighted mean magnitude
$$
\bar{m} \equiv \frac{\sum_i m_i / \delta_i^2}{\sum_i 1 / \delta_i^2}.
$$
See [Mean](crate::Mean) for non-weighted mean.
- Depends on: **magnitude**, **magnitude error**
- Minimum number of observations: **1**
- Number of features: **1**
"#;
}
#[doc = DOC!()]
#[derive(Clone, Default, Debug, Serialize, Deserialize, JsonSchema)]
pub struct WeightedMean {}
lazy_info!(
WEIGHTED_MEAN_INFO,
WeightedMean,
size: 1,
min_ts_length: 1,
t_required: false,
m_required: true,
w_required: true,
sorting_required: false,
);
impl WeightedMean {
pub fn new() -> Self {
Self {}
}
pub fn doc() -> &'static str {
DOC
}
}
impl FeatureNamesDescriptionsTrait for WeightedMean {
fn get_names(&self) -> Vec<&str> {
vec!["weighted_mean"]
}
fn get_descriptions(&self) -> Vec<&str> {
vec!["magnitude averaged weighted by inverse square error"]
}
}
impl<T> FeatureEvaluator<T> for WeightedMean
where
T: Float,
{
fn eval(&self, ts: &mut TimeSeries<T>) -> Result<Vec<T>, EvaluatorError> {
self.check_ts_length(ts)?;
Ok(vec![ts.get_m_weighted_mean()])
}
}
#[cfg(test)]
#[allow(clippy::unreadable_literal)]
#[allow(clippy::excessive_precision)]
mod tests {
use super::*;
use crate::tests::*;
check_feature!(WeightedMean);
feature_test!(
weighted_mean,
[WeightedMean::new()],
[1.1777777777777778],
[1.0; 5], [0.0_f32, 1.0, 2.0, 3.0, 4.0],
[10.0, 5.0, 3.0, 2.5, 2.0],
);
}