# shrinkage::ValidationMetric Shrinkage for Rust · 0.3.0 [Source]() ```rust pub enum ValidationMetric ``` Validation losses averaged over held-out observations; lower is better. Prediction inputs are original-scale linear predictors, including logits for binomial scores. Scores exclude the penalty and use no training-size correction. Binomial deviance subtracts the fractional-response saturated loss before doubling, whereas log loss is the negative log likelihood. ## Variants ### `BinomialDeviance` ```rust BinomialDeviance ``` [Source]() Binomial mean deviance, twice the excess loss above saturation. ### `LogLoss` ```rust LogLoss ``` [Source]() Binomial mean negative log likelihood, evaluated stably from logits. ### `MeanAbsoluteError` ```rust MeanAbsoluteError ``` [Source]() Gaussian mean absolute prediction error. ### `MeanSquaredError` ```rust MeanSquaredError ``` [Source]() Gaussian mean squared error, twice the fitting loss. ## Inherent implementation [Source]() ```rust impl ValidationMetric ``` ### `score` ```rust pub fn score(self, response: &[f64], predictor: &[f64]) -> Result ``` [Source]() Evaluate a score on equally weighted held-out observations. #### Errors Reject empty or mismatched inputs, invalid responses, and nonfinite predictors or arithmetic. Binomial responses must lie in `[0, 1]`. ## Implementation of Clone [Source]() ```rust impl Clone for ValidationMetric ``` ### `clone` ```rust fn clone(&self) -> Self ``` [Source]() ## Implementation of Copy [Source]() ```rust impl Copy for ValidationMetric ``` ## Implementation of Debug [Source]() ```rust impl Debug for ValidationMetric ``` ### `fmt` ```rust fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result ``` [Source]() ## Implementation of Eq [Source]() ```rust impl Eq for ValidationMetric ``` ## Implementation of PartialEq [Source]() ```rust impl PartialEq for ValidationMetric ``` ### `eq` ```rust fn eq(&self, other: &Self) -> bool ``` [Source]() ## Implementation of StructuralPartialEq [Source]() ```rust impl StructuralPartialEq for ValidationMetric ``` ## Implementation of Freeze ```rust impl Freeze for ValidationMetric ``` ## Implementation of RefUnwindSafe ```rust impl RefUnwindSafe for ValidationMetric ``` ## Implementation of Send ```rust impl Send for ValidationMetric ``` ## Implementation of Sync ```rust impl Sync for ValidationMetric ``` ## Implementation of Unpin ```rust impl Unpin for ValidationMetric ``` ## Implementation of UnsafeUnpin ```rust impl UnsafeUnpin for ValidationMetric ``` ## Implementation of UnwindSafe ```rust impl UnwindSafe for ValidationMetric ``` ## Implementation of Any ```rust impl Any for T where T: 'static + ?Sized ``` ## Implementation of Boilerplate ```rust impl Boilerplate for T where T: Copy + Send + Sync + Debug + PartialEq + 'static ``` ## Implementation of Borrow ```rust impl Borrow for T where T: ?Sized ``` ## Implementation of BorrowMut ```rust impl BorrowMut for T where T: ?Sized ``` ## Implementation of ByRef ```rust impl ByRef for T ``` ## Implementation of CastableFrom ```rust impl CastableFrom for DT where ST: ?Sized, DT: ?Sized ``` ## Implementation of CastableFrom ```rust impl CastableFrom for DT where ST: ?Sized, DT: ?Sized ``` ## Implementation of CloneToUninit ```rust impl CloneToUninit for T where T: Clone ``` ## Implementation of Equivalent ```rust impl Equivalent for Q where Q: Eq + ?Sized, K: Borrow + ?Sized ``` ## Implementation of Equivalent ```rust impl Equivalent for Q where Q: Eq + ?Sized, K: Borrow + ?Sized ``` ## Implementation of From ```rust impl From for T ``` ## Implementation of Imply ```rust impl Imply for U where T: ?Sized, U: ?Sized ``` ## Implementation of Into ```rust impl Into for T where U: From ``` ## Implementation of IntoEither ```rust impl IntoEither for T ``` ## Implementation of Pointable ```rust impl Pointable for T ``` ## Implementation of Read ```rust impl Read for T where T: ?Sized ``` ## Implementation of Same ```rust impl Same for T ``` ## Implementation of Scalar ```rust impl Scalar for T where T: 'static + Clone + PartialEq + Debug ``` ## Implementation of SupersetOf ```rust impl SupersetOf for SP where SS: SubsetOf ``` ## Implementation of ToOwned ```rust impl ToOwned for T where T: Clone ``` ## Implementation of TryFrom ```rust impl TryFrom for T where U: Into ``` ## Implementation of TryInto ```rust impl TryInto for T where U: TryFrom ```