# shrinkage::HybridStep Shrinkage for Rust · 0.3.0 [Source]() ```rust pub enum HybridStep ``` Curvature policy for [`HybridCoordinateDescent`](<6e142c2de8c70807e35ff7553fffda094241be993dc7a332ee193688dc1f04bf>)'s proximal-gradient transitions. ## Variants ### `Backtracking` ```rust Backtracking { initial_curvature: Option, max_backtracks: usize } ``` [Source]() Validate each transition against the current quadratic model. Accepted curvatures can only increase within a quadratic solve. #### `initial_curvature` ```rust initial_curvature: Option ``` [Source]() Positive curvature seed, or the largest averaged column curvature. Include the intercept curvature when enabled; use one at zero. #### `max_backtracks` ```rust max_backtracks: usize ``` [Source]() Maximum number of curvature doublings after the first trial. ### `FixedBound` ```rust FixedBound ``` [Source]() Use a computed Frobenius upper bound, including the intercept column. The bound is conservative and requires no spectral estimate or Gram. ## Implementation of Clone [Source]() ```rust impl Clone for HybridStep ``` ### `clone` ```rust fn clone(&self) -> Self ``` [Source]() ## Implementation of Copy [Source]() ```rust impl Copy for HybridStep ``` ## Implementation of Debug [Source]() ```rust impl Debug for HybridStep ``` ### `fmt` ```rust fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result ``` [Source]() ## Implementation of Default [Source]() ```rust impl Default for HybridStep ``` ### `default` ```rust fn default() -> Self ``` [Source]() ## Implementation of PartialEq [Source]() ```rust impl PartialEq for HybridStep ``` ### `eq` ```rust fn eq(&self, other: &Self) -> bool ``` [Source]() ## Implementation of StructuralPartialEq [Source]() ```rust impl StructuralPartialEq for HybridStep ``` ## Implementation of Freeze ```rust impl Freeze for HybridStep ``` ## Implementation of RefUnwindSafe ```rust impl RefUnwindSafe for HybridStep ``` ## Implementation of Send ```rust impl Send for HybridStep ``` ## Implementation of Sync ```rust impl Sync for HybridStep ``` ## Implementation of Unpin ```rust impl Unpin for HybridStep ``` ## Implementation of UnsafeUnpin ```rust impl UnsafeUnpin for HybridStep ``` ## Implementation of UnwindSafe ```rust impl UnwindSafe for HybridStep ``` ## 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 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 ```