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//! Stats-layer errors.
//!
//! SPDX-License-Identifier: MIT OR Apache-2.0
use thiserror::Error;
/// Statistical / linear algebra errors.
#[derive(Clone, Debug, Eq, PartialEq, Error)]
#[non_exhaustive]
pub enum StatsError {
/// Shape mismatch.
#[error("shape error: {message}")]
Shape {
/// Context.
message: &'static str,
},
/// Rank deficiency / singular design.
#[error("rank deficient: rank={rank} ncols={ncols}")]
RankDeficient {
/// Detected rank.
rank: usize,
/// Number of columns.
ncols: usize,
},
/// Materially non-positive variance after inclusion–exclusion (not FP noise).
#[error("non-positive variance: {message}")]
NonPositiveVariance {
/// Context.
message: &'static str,
},
/// Requested option is not implemented on this code path.
#[error("unsupported: {message}")]
Unsupported {
/// Context.
message: &'static str,
},
/// Backend failure.
#[error("backend error: {0}")]
Backend(String),
}