# shrinkage::StepKind

Shrinkage for Rust · 0.3.0

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

```rust
pub enum StepKind
```

The operation that produced an observed optimization state. 

<a id="variants"></a>

## Variants

<a id="variant-Block"></a>

### `Block`

```rust
Block { index: usize }
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

One cluster or segment update within a hybrid sweep. 

<a id="variant-Block-field-index"></a>

#### `index`

```rust
index: usize
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

Zero-based visit within the sweep, rather than a feature index. 

<a id="variant-Coordinate"></a>

### `Coordinate`

```rust
Coordinate { index: usize }
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

One coordinate update, with a zero-based feature index. 

<a id="variant-Coordinate-field-index"></a>

#### `index`

```rust
index: usize
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

Coordinate updated by this step. 

<a id="variant-CoordinateSweep"></a>

### `CoordinateSweep`

```rust
CoordinateSweep
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

One complete cluster or segment sweep in a hybrid solve. 

<a id="variant-Final"></a>

### `Final`

```rust
Final(shrinkage::Termination)
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

Final state and termination reason, including initially optimal fits. 

<a id="variant-Final-field-0"></a>

#### `0`

```rust
0: shrinkage::Termination
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

<a id="variant-Initial"></a>

### `Initial`

```rust
Initial
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

Validated solver initialization, before the first update. 

<a id="variant-Intercept"></a>

### `Intercept`

```rust
Intercept
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

An unpenalized intercept update. 

<a id="variant-Irls"></a>

### `Irls`

```rust
Irls
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

An accepted outer IRLS update on the original objective. 

<a id="variant-ProximalGradient"></a>

### `ProximalGradient`

```rust
ProximalGradient
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

An accepted proximal-gradient update on the current eligible features. 

<a id="impl-3646990b3bbc8cd3ff0b2369643ba8984c85f1290c223e813a48ee13f333162c"></a>

## Implementation of Clone

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

```rust
impl Clone for StepKind
```

<a id="method-clone-3646990b3bbc8cd3ff0b2369643ba8984c85f1290c223e813a48ee13f333162c"></a>

### `clone`

```rust
fn clone(&self) -> Self
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

<a id="impl-67fb6690c21690092ec3947e126270a2c3a031157ef06e1c96b41aeeecb05b88"></a>

## Implementation of Copy

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

```rust
impl Copy for StepKind
```

<a id="impl-a36c192c0adaf2f18a899f05553d7e6475099c7e06c0170d4f07ea6ff6fbba5f"></a>

## Implementation of Debug

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

```rust
impl Debug for StepKind
```

<a id="method-fmt-a36c192c0adaf2f18a899f05553d7e6475099c7e06c0170d4f07ea6ff6fbba5f"></a>

### `fmt`

```rust
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

<a id="impl-c57c2a96360085c16a13c2029ec3627bbfe451b3b47372a997363cce0bf84c15"></a>

## Implementation of Eq

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

```rust
impl Eq for StepKind
```

<a id="impl-3957613ec3c223378d15d87303aaa21f5748f8d09ab2ec1f3353bf601a7305fb"></a>

## Implementation of PartialEq

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

```rust
impl PartialEq for StepKind
```

<a id="method-eq-3957613ec3c223378d15d87303aaa21f5748f8d09ab2ec1f3353bf601a7305fb"></a>

### `eq`

```rust
fn eq(&self, other: &Self) -> bool
```

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

<a id="impl-a0fc9bc5d2333668d2590af4fc3cf3ea0f2f9fc574dd839744fb203c78618391"></a>

## Implementation of StructuralPartialEq

[Source](<https://github.com/jolars/shrinkage/blob/eeafe449edce19d3c552a03060f681ae3891af74/src/solver/observer.rs>)

```rust
impl StructuralPartialEq for StepKind
```

<a id="impl-c321d3e21f6a6e462ff22c637cd0556407c1b33ae3297a0f9ab53ac8610efe48"></a>

## Implementation of Freeze

```rust
impl Freeze for StepKind
```

<a id="impl-a657270ce4585acdd881d99ac2552eab6a4e7f413c274f10e89cd4caac2ffd53"></a>

## Implementation of RefUnwindSafe

```rust
impl RefUnwindSafe for StepKind
```

<a id="impl-3c0d666f1d558ddd1aa7828c548fb5a43f45c4699b09e4f47bf91126084ea9a5"></a>

## Implementation of Send

```rust
impl Send for StepKind
```

<a id="impl-4f315e0ddb35699186eae6ebf6b146e7d02b5e23b34b4ac6da7294496a459074"></a>

## Implementation of Sync

```rust
impl Sync for StepKind
```

<a id="impl-ac8ad4c10928ae35185543307da6a25e188c0b65f91469d16ab91f9677a38de1"></a>

## Implementation of Unpin

```rust
impl Unpin for StepKind
```

<a id="impl-2f365bd08fde851c7df52cd1721490ddc091a0a7622715bdf2da4c1d0ca5c9b3"></a>

## Implementation of UnsafeUnpin

```rust
impl UnsafeUnpin for StepKind
```

<a id="impl-c1100b1087b0ab52a23fb74eb94887ffa9c24fd75cd4695edf00a65e7840dc65"></a>

## Implementation of UnwindSafe

```rust
impl UnwindSafe for StepKind
```

<a id="impl-1e5682dc18e03c648aa9b125290c107c1e8d96ce8a179a8532e4057da4daf0cd"></a>

## Implementation of Any

```rust
impl<T> Any for T where T: 'static + ?Sized
```

<a id="impl-ef39a31d69bd7e2a30223e623f4d8223aea46d8fc4f42e14bffa3ec7c63b5f4e"></a>

## Implementation of Boilerplate

```rust
impl<T> Boilerplate for T where T: Copy + Send + Sync + Debug + PartialEq + 'static
```

<a id="impl-6c0b25c2c92cdb117802d9c0a4c70afc9a8bfb0da875bc6e66191e2349fcdf3f"></a>

## Implementation of Borrow

```rust
impl<T> Borrow<T> for T where T: ?Sized
```

<a id="impl-796e80d926348273a22b04d8e84f510693b11c06ec57c3c3e2e8c1524094a85c"></a>

## Implementation of BorrowMut

```rust
impl<T> BorrowMut<T> for T where T: ?Sized
```

<a id="impl-8360e4092e7ec4a05a26dd304cd739398f0cacc50c8d08dd5be0223d1a08d02e"></a>

## Implementation of ByRef

```rust
impl<T> ByRef<T> for T
```

<a id="impl-dbb1293b7b5dd80c4d9a98cfdd6843dc7470224c0b1387731cd418da07046d7b"></a>

## Implementation of CastableFrom

```rust
impl<ST, DT> CastableFrom<ST, Initialized, Initialized> for DT where ST: ?Sized, DT: ?Sized
```

<a id="impl-97b65e7dfc44b5ecaa495a3a19fe737914a1e9f8532200cf8f46191314e7d777"></a>

## Implementation of CastableFrom

```rust
impl<ST, DT> CastableFrom<ST, Uninit, Uninit> for DT where ST: ?Sized, DT: ?Sized
```

<a id="impl-86d7da2bfd1140cc1675dfe6a975e6a2762338ab32731152da0723858ef3aa81"></a>

## Implementation of CloneToUninit

```rust
impl<T> CloneToUninit for T where T: Clone
```

<a id="impl-d82ade77f1f9b6253ee49e007ed46a4df3334a6069d1fdef6fd67634c6a19d9a"></a>

## Implementation of Equivalent

```rust
impl<Q, K> Equivalent<K> for Q where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized
```

<a id="impl-a4865d4893a8972c2d56ee8a90bead5c7361c039dd168c58c183431204efd0d1"></a>

## Implementation of Equivalent

```rust
impl<Q, K> Equivalent<K> for Q where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized
```

<a id="impl-c22bdd3b1b677b66eb32d1c182cc1410c7f0c46491dd74e6a659647c238d19ec"></a>

## Implementation of From

```rust
impl<T> From<T> for T
```

<a id="impl-5adf6ca1830f30fbbac655ab8ff394d254954df7ededc7cc833c72fdc87d6f00"></a>

## Implementation of Imply

```rust
impl<T, U> Imply<T> for U where T: ?Sized, U: ?Sized
```

<a id="impl-85eec431edd188129f88290bbcb748e4d2fdc97f7efef3c162b8c252286ffec0"></a>

## Implementation of Into

```rust
impl<T, U> Into<U> for T where U: From<T>
```

<a id="impl-c40268dd59dd3329202d3c0544c62372e98ff3baa8ec442ec00752e024ec1d06"></a>

## Implementation of IntoEither

```rust
impl<T> IntoEither for T
```

<a id="impl-5655b1ef858b34a584cb80104f040c8a4063ced0d281311a0833ed12aefde86e"></a>

## Implementation of Pointable

```rust
impl<T> Pointable for T
```

<a id="impl-8cc2aa01198fc9fa44f08b889f62988d70d2a7f4f0f11f4666d4c08bdaddb22a"></a>

## Implementation of Read

```rust
impl<T> Read<Exclusive, BecauseExclusive> for T where T: ?Sized
```

<a id="impl-5ea09131039c62dd92b119d480a35c7e2b33d2b81dccf0b849f6b1f19f4bda24"></a>

## Implementation of Same

```rust
impl<T> Same for T
```

<a id="impl-e7c74775fb3ccca97dde289783210508c61e4f404318b19c70c2c185f535f063"></a>

## Implementation of Scalar

```rust
impl<T> Scalar for T where T: 'static + Clone + PartialEq + Debug
```

<a id="impl-7ee6ff38d6674f5edfe4734359062c2a67a572cff5899a89704764822b931c7f"></a>

## Implementation of SupersetOf

```rust
impl<SS, SP> SupersetOf<SS> for SP where SS: SubsetOf<SP>
```

<a id="impl-a8ef6e94191301c3685488478f4905086c47137bac2d606ea4d09631d5472b06"></a>

## Implementation of ToOwned

```rust
impl<T> ToOwned for T where T: Clone
```

<a id="impl-83960135d00d98080c95a08867729696e36811280c2dd9cf34c1b4fe21c81e18"></a>

## Implementation of TryFrom

```rust
impl<T, U> TryFrom<U> for T where U: Into<T>
```

<a id="impl-1cc495bcaa5112ffb304e7f0de674feca391fd97f47bec86033a9225b72ac05c"></a>

## Implementation of TryInto

```rust
impl<T, U> TryInto<U> for T where U: TryFrom<T>
```